乙基 2,2-二甲基-8-氧代十二酸乙酯

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 2,2-dimethyl-8-oxododecanoic acid ethyl ester (14.33 g, 5.3 mmol) in Et2O (30 mL) was added to a suspension of LiAlH4 (4.6 g, 12 mmol) in Et2O (200 mL). The reaction mixture was heated to reflux for 2 h. Water (100 mL) and aqueous HCl (10%, 200 mL) were added. The aqueous solution was separated and extracted with Et2O (2×100 mL). The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL, then 1:3, 150 mL) to yield 2,2-dimethyldodecan-1,8-diol (9.9 g, 81%) as a colorless oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.55 (br s, 1H), 3.29 (s, 2H), 1.7 (br. s, 2H), 1.42-1.20 (m, 16H), 0.89 (t, J=7.2 Hz, 3H), 0.84 (s, 6H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 72.1, 72.0, 38.7, 37.6, 37.3, 35.2, 30.8, 28.0, 25.8, 24.0, 23.9, 22.9, 14.3. HRMS (LSIMS, gly): Calcd for C14H31O2 (M+): 231.2324. found: 231.2324. HPLC: 99.8% pure. Elemental analysis (C14H30O2): Calcd for C, 72.99; H, 13.12. Found: C, 72.75; H, 13.23. The reaction mixture was heated to reflux for 2 h The aqueous solution was separated extracted with Et2O (2×100 mL) The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 2,2-dimethyl-8-oxododecanoic acid ethyl ester (14.33 g, 5.3 mmol) in Et2O (30 mL) was added to a suspension of LiAlH4 (4.6 g, 12 mmol) in Et2O (200 mL). The reaction mixture was heated to reflux for 2 h. Water (100 mL) and aqueous HCl (10%, 200 mL) were added. The aqueous solution was separated and extracted with Et2O (2×100 mL). The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL, then 1:3, 150 mL) to yield 2,2-dimethyldodecan-1,8-diol (9.9 g, 81%) as a colorless oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.55 (br s, 1H), 3.29 (s, 2H), 1.7 (br. s, 2H), 1.42-1.20 (m, 16H), 0.89 (t, J=7.2 Hz, 3H), 0.84 (s, 6H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 72.1, 72.0, 38.7, 37.6, 37.3, 35.2, 30.8, 28.0, 25.8, 24.0, 23.9, 22.9, 14.3. HRMS (LSIMS, gly): Calcd for C14H31O2 (M+): 231.2324. found: 231.2324. HPLC: 99.8% pure. Elemental analysis (C14H30O2): Calcd for C, 72.99; H, 13.12. Found: C, 72.75; H, 13.23. The reaction mixture was heated to reflux for 2 h The aqueous solution was separated extracted with Et2O (2×100 mL) The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: An aqueous solution of NaOH (30%, 240 mL) was added dropwise to a stirred solution of 4-iodobutane (110.5 g, 0.6 mol), p-toluenesulfonyl methyl isocyanide (58.6 g, 0.3 mol), and tetrabutylammonium iodide (8.0 g, 21.6 mmol) in CH2Cl2 (300 mL) at room temperature. The reaction mixture was stirred overnight and diluted with water (200 mL). The organic layer was separated and the aqueous layer was extracted with CH2Cl2 (3×100 mL). The organic layers were combined, washed with saturated NaCl solution (100 mL), dried over MgSO4, and concentrated in vacuo. The residue was taken up in diethyl ether (3×200 mL) and filtered. The filtrate was concentrated and purified by column chromatography (silica gel, ethyl acetate/hexanes=1:3) to give 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (65.7 g, 87%) as an oil. Under N2-atmosphere, sodium hydride (60% dispersion in mineral oil, 11.0 g, 0.275 mol) was added in portions to a solution of ethyl 7-bromo-2,2-dimethylheptanoate (72.8 g, 0.27 mol) and 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (69.0 g, 0.27 mol) in DMSO (500 mL) and diethyl ether (500 mL) at room temperature. After 30 min, tetrabutylammonium iodide (8.0 g, 21.7 mmol) was added and the mixture was stirred for 5 h. A precipitate formed and additional DMSO (500 mL) was added. After stirring overnight at room temperature, the mixture was heated to reflux for 3 h. Water (500 mL) and diethyl ether (500 mL) were added and the layers were separated. The aqueous layer was extracted with diethyl ether (4×200 mL). The combined organic layers were washed with water (500 mL) and saturated NaCl solution (300 mL), dried over MgSO4, and concentrated in vacuo to give crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g) as a dark oil, which was used without further purification. Concentrated, hydrochloric acid (200 mL) was added slowly to a solution of crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g, 0.29 mol) in methylene chloride (300 mL). The reaction mixture was stirred at room temperature for 4 h. Water (500 mL) was added. The aqueous layer was separated and extracted with methylene chloride (3×100 mL). The organic solutions were combined, washed with water (300 mL) and saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10) to yield 2,2-dimethyl-8-oxododecanoic acid ethyl ester (69.6 g, 89%) as an oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 4.1 (q, J=7.3 Hz, 2H), 2.40-2.31 (m, 4H), 1.58-1.45 (m, 6H), 1.31-1.19 (m, 6H), 1.22 (t, 3H, J=7.3 Hz), 1.12 (s, 6H), 0.88 (t, J=7.3 Hz, 3H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 210.5, 178.0, 60.5, 42.5, 42.0, 30.0, 27.0, 26.0, 25.5, 24.0, 23.0, 14.5, 14.0. HRMS (LSIMS, gly): Calcd for C16H31O3 (MH+): 271.2273. found: 271.2275. HPLC: 84% pure. was used without further purification Concentrated The aqueous layer was separated extracted with methylene chloride (3×100 mL) washed with water (300 mL) saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 2,2-dimethyl-8-oxododecanoic acid ethyl ester (14.33 g, 5.3 mmol) in Et2O (30 mL) was added to a suspension of LiAlH4 (4.6 g, 12 mmol) in Et2O (200 mL). The reaction mixture was heated to reflux for 2 h. Water (100 mL) and aqueous HCl (10%, 200 mL) were added. The aqueous solution was separated and extracted with Et2O (2×100 mL). The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL, then 1:3, 150 mL) to yield 2,2-dimethyldodecan-1,8-diol (9.9 g, 81%) as a colorless oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.55 (br s, 1H), 3.29 (s, 2H), 1.7 (br. s, 2H), 1.42-1.20 (m, 16H), 0.89 (t, J=7.2 Hz, 3H), 0.84 (s, 6H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 72.1, 72.0, 38.7, 37.6, 37.3, 35.2, 30.8, 28.0, 25.8, 24.0, 23.9, 22.9, 14.3. HRMS (LSIMS, gly): Calcd for C14H31O2 (MH+): 231.2324, found: 231.2324. HPLC: 99.8% pure. Elemental analysis (C14H30O2): Calcd for C, 72.99; H, 13.12. Found: C, 72.75; H, 13.23. The reaction mixture was heated to reflux for 2 h The aqueous solution was separated extracted with Et2O (2×100 mL) The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: An aqueous solution of NaOH (30%, 240 mL) was added dropwise to a stirred solution of 4-iodobutane (110.5 g, 0.6 mol), p-toluenesulfonyl methyl isocyanide (58.6 g, 0.3 mol), and tetrabutylammonium iodide (8.0 g, 21.6 mmol) in CH2Cl2 (300 mL) at room temperature. The reaction mixture was stirred overnight and diluted with water (200 mL). The organic layer was separated and the aqueous layer was extracted with CH2Cl2 (3×100 mL). The organic layers were combined, washed with saturated NaCl solution (100 mL), dried over MgSO4, and concentrated in vacuo. The residue was taken up in diethyl ether (3×200 mL) and filtered. The filtrate was concentrated and purified by column chromatography (silica gel, ethyl acetate/hexanes=1:3) to give 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (65.7 g, 87%) as an oil. Under N2-atmosphere, sodium hydride (60% dispersion in mineral oil, 11.0 g, 0.275 mol) was added in portions to a solution of ethyl 7-bromo-2,2-dimethylheptanoate (72.8 g, 0.27 mol) and 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (69.0 g, 0.27 mol) in DMSO (500 mL) and diethyl ether (500 mL) at room temperature. After 30 min, tetrabutylammonium iodide (8.0 g, 21.7 mmol) was added and the mixture was stirred for 5 h. A precipitate formed and additional DMSO (500 mL) was added. After stirring overnight at room temperature, the mixture was heated to reflux for 3 h. Water (500 mL) and diethyl ether (500 mL) were added and the layers were separated. The aqueous layer was extracted with diethyl ether (4×200 mL). The combined organic layers were washed with water (500 mL) and saturated NaCl solution (300 mL), dried over MgSO4, and concentrated in vacuo to give crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g) as a dark oil, which was used without further purification. Concentrated, hydrochloric acid (200 mL) was added slowly to a solution of crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g, 0.29 mol) in methylene chloride (300 mL). The reaction mixture was stirred at room temperature for 4 h. Water (500 mL) was added. The aqueous layer was separated and extracted with methylene chloride (3×100 mL). The organic solutions were combined, washed with water (300 mL) and saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10) to yield 2,2-dimethyl-8-oxododecanoic acid ethyl ester (69.6 g, 89%) as an oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 4.1 (q, J=7.3 Hz, 2H), 2.40-2.31 (m, 4H), 1.58-1.45 (m, 6H), 1.31-1.19 (m, 6H), 1.22 (t, 3H, J=7.3 Hz), 1.12 (s, 6H), 0.88 (t, J=7.3 Hz, 3H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 210.5, 178.0, 60.5, 42.5, 42.0, 30.0, 27.0, 26.0, 25.5, 24.0, 23.0, 14.5, 14.0. HRMS (LSIMS, gly): Calcd for C16H31O3 (MH+): 271.2273, found: 271.2275. HPLC: 84% pure. was used without further purification Concentrated The aqueous layer was separated extracted with methylene chloride (3×100 mL) washed with water (300 mL) saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 2,2-dimethyl-8-oxododecanoic acid ethyl ester (14.33 g, 5.3 mmol) in Et2O (30 mL) was added to a suspension of LiAlH4 (4.6 g, 12 mmol) in Et2O (200 mL). The reaction mixture was heated to reflux for 2 h. Water (100 mL) and aqueous HCl (10%, 200 mL) were added. The aqueous solution was separated and extracted with Et2O (2×100 mL). The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL, then 1:3, 150 mL) to yield 2,2-dimethyldodecan-1,8-diol (9.9 g, 81%) as a colorless oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.55 (br s, 1H), 3.29 (s, 2H), 1.7 (br. s, 2H), 1.42-1.20 (m, 16H), 0.89 (t, J=7.2 Hz, 3H), 0.84 (s, 6H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 72.1, 72.0, 38.7, 37.6, 37.3, 35.2, 30.8, 28.0, 25.8, 24.0, 23.9, 22.9, 14.3. HRMS (LSIMS, gly): Calcd for C14H31O2 (MH+): 231.2324. found: 231.2324. HPLC: 99.8% pure. Elemental analysis (C14H30O2): Calcd for C, 72.99; H, 13.12. Found: C, 72.75; H, 13.23. The reaction mixture was heated to reflux for 2 h The aqueous solution was separated extracted with Et2O (2×100 mL) The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: An aqueous solution of NaOH (30%, 240 mL) was added dropwise to a stirred solution of 4-iodobutane (110.5 g, 0.6 mol), p-toluenesulfonyl methyl isocyanide (58.6 g, 0.3 mol), and tetrabutylammonium iodide (8.0 g, 21.6 mmol) in CH2Cl2 (300 mL) at room temperature. The reaction mixture was stirred overnight and diluted with water (200 mL). The organic layer was separated and the aqueous layer was extracted with CH2Cl2 (3×100 mL). The organic layers were combined, washed with saturated NaCl solution (100 mL), dried over MgSO4, and concentrated in vacuo. The residue was taken up in diethyl ether (3×200 mL) and filtered. The filtrate was concentrated and purified by column chromatography (silica gel, ethyl acetate/hexanes=1:3) to give 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (65.7 g, 87%) as an oil. Under N2-atmosphere, sodium hydride (60% dispersion in mineral oil, 11.0 g, 0.275 mol) was added in portions to a solution of ethyl 7-bromo-2,2-dimethylheptanoate (72.8 g, 0.27 mol) and 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (69.0 g, 0.27 mol) in DMSO (500 mL) and diethyl ether (500 mL) at room temperature. After 30 min, tetrabutylammonium iodide (8.0 g, 21.7 mmol) was added and the mixture was stirred for 5 h. A precipitate formed and additional DMSO (500 mL) was added. After stirring overnight at room temperature, the mixture was heated to reflux for 3 h. Water (500 mL) and diethyl ether (500 mL) were added and the layers were separated. The aqueous layer was extracted with diethyl ether (4×200 mL). The combined organic layers were washed with water (500 mL) and saturated NaCl solution (300 mL), dried over MgSO4, and concentrated in vacuo to give crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g) as a dark oil, which was used without further purification. Concentrated, hydrochloric acid (200 mL) was added slowly to a solution of crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g, 0.29 mol) in methylene chloride (300 mL). The reaction mixture was stirred at room temperature for 4 h. Water (500 mL) was added. The aqueous layer was separated and extracted with methylene chloride (3×100 mL). The organic solutions were combined, washed with water (300 mL) and saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10) to yield 2,2-dimethyl-8-oxododecanoic acid ethyl ester (69.6 g, 89%) as an oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 4.1 (q, J=7.3 Hz, 2H), 2.40-2.31 (m, 4H), 1.58-1.45 (m, 6H), 1.31-1.19 (m, 6H), 1.22 (t, 3H, J=7.3 Hz), 1.12 (s, 6H), 0.88 (t, J=7.3 Hz, 3H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 210.5, 178.0, 60.5, 42.5, 42.0, 30.0, 27.0, 26.0, 25.5, 24.0, 23.0, 14.5, 14.0. HRMS (LSIMS, gly): Calcd for C16H31O3 (MH+): 271.2273. found: 271.2275. HPLC: 84% pure. was used without further purification Concentrated The aqueous layer was separated extracted with methylene chloride (3×100 mL) washed with water (300 mL) saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 2,2-dimethyl-8-oxododecanoic acid ethyl ester (14.33 g, 5.3 mmol) in Et2O (30 mL) was added to a suspension of LiAlH4 (4.6 g, 12 mmol) in Et2O (200 mL). The reaction mixture was heated to reflux for 2 h. Water (100 mL) and aqueous HCl (10%, 200 mL) were added. The aqueous solution was separated and extracted with Et2O (2×100 mL). The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL, then 1:3, 150 mL) to yield 2,2-dimethyldodecan-1,8-diol (9.9 g, 81%) as a colorless oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.55 (br s, 1 H), 3.29 (s, 2 H), 1.7 (br. s, 2 H), 1.42-1.20 (m, 16 H), 0.89 (t, J=7.2 Hz, 3 H), 0.84 (s, 6 H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 72.1, 72.0, 38.7, 37.6, 37.3, 35.2, 30.8, 28.0, 25.8, 24.0, 23.9, 22.9, 14.3. HRMS (LSIMS, gly): Calcd for C14H31O2 (MH+): 231.2324, found: 231.2324. HPLC: 99.8% pure. Elemental analysis (C14H30O2): Calcd for C, 72.99; H, 13.12. Found: C, 72.75; H, 13.23. The reaction mixture was heated to reflux for 2 h The aqueous solution was separated extracted with Et2O (2×100 mL) The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: An aqueous solution of NaOH (30%, 240 mL) was added dropwise to a stirred solution of 4-iodobutane (110.5 g, 0.6 mol), p-toluenesulfonyl methyl isocyanide (58.6 g, 0.3 mol), and tetrabutylammonium iodide (8.0 g, 21.6 mmol) in CH2Cl2 (300 mL) at room temperature. The reaction mixture was stirred overnight and diluted with water (200 mL). The organic layer was separated and the aqueous layer was extracted with CH2Cl2 (3×100 mL). The organic layers were combined, washed with saturated NaCl solution (100 mL), dried over MgSO4, and concentrated in vacuo. The residue was taken up in diethyl ether (3×200 mL) and filtered. The filtrate was concentrated and purified by column chromatography (silica gel, ethyl acetate/hexanes=1:3) to give 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (65.7 g, 87%) as an oil. Under N2-atmosphere, sodium hydride (60% dispersion in mineral oil, 11.0 g, 0.275 mol) was added in portions to a solution of ethyl 7-bromo-2,2-dimethylheptanoate (72.8 g, 0.27 mol) and 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (69.0 g, 0.27 mol) in DMSO (500 mL) and diethyl ether (500 mL) at room temperature. After 30 min, tetrabutylammonium iodide (8.0 g, 21.7 mmol) was added and the mixture was stirred for 5 h. A precipitate formed and additional DMSO (500 mL) was added. After stirring overnight at room temperature, the mixture was heated to reflux for 3 h. Water (500 mL) and diethyl ether (500 mL) were added and the layers were separated. The aqueous layer was extracted with diethyl ether (4×200 mL). The combined organic layers were washed with water (500 mL) and saturated NaCl solution (300 mL), dried over MgSO4, and concentrated in vacuo to give crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g) as a dark oil, which was used without further purification. Concentrated, hydrochloric acid (200 mL) was added slowly to a solution of crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g, 0.29 mol) in methylene chloride (300 mL). The reaction mixture was stirred at room temperature for 4 h. Water (500 mL) was added. The aqueous layer was separated and extracted with methylene chloride (3×100 mL). The organic solutions were combined, washed with water (300 mL) and saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10) to yield 2,2-dimethyl-8-oxododecanoic acid ethyl ester (69.6 g, 89%) as an oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 4.1 (q, J=7.3 Hz, 2 H), 2.40-2.31 (m, 4 H), 1.58-1.45 (m, 6 H), 1.31-1.19 (m, 6H), 1.22 (t, 3 H, J=7.3 Hz), 1.12 (s, 6 H), 0.88 (t, J=7.3 Hz, 3 H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 210.5, 178.0, 60.5, 42.5, 42.0, 30.0, 27.0, 26.0, 25.5, 24.0, 23.0, 14.5, 14.0. HRMS (LSIMS, gly): Calcd for C16H31O3 (MH+): 271.2273, found: 271.2275. HPLC: 84% pure. was used without further purification Concentrated The aqueous layer was separated extracted with methylene chloride (3×100 mL) washed with water (300 mL) saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10)

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 2,2-dimethyl-8-oxododecanoic acid ethyl ester (14.33 g, 5.3 mmol) in Et2O (30 mL) was added to a suspension of LiAlH4 (4.6 g, 12 mmol) in Et2O (200 mL). The reaction mixture was heated to reflux for 2 h. Water (100 mL) and aqueous HCl (10%, 200 mL) were added. The aqueous solution was separated and extracted with Et2O (2×100 mL). The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL, then 1:3, 150 mL) to yield 2,2-dimethyldodecan-1,8-diol (9.9 g, 81%) as a colorless oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 3.55 (br s, 1H), 3.29 (s, 2H), 1.7 (br. s, 2H), 1.42-1.20 (m, 16H), 0.89 (t, J=7.2 Hz, 3H), 0.84 (s, 6H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 72.1, 72.0, 38.7, 37.6, 37.3, 35.2, 30.8, 28.0, 25.8, 24.0, 23.9, 22.9, 14.3. HRMS (LSIMS, gly): Calcd for C14H31O2 (M+): 231.2324. found: 231.2324. HPLC: 99.8% pure. Elemental analysis (C14H30O2): Calcd for C, 72.99; H, 13.12. Found: C, 72.75; H, 13.23. The reaction mixture was heated to reflux for 2 h The aqueous solution was separated extracted with Et2O (2×100 mL) The combined organic solutions were washed with saturated, aqueous NaHCO3 solution (100 mL) and brine (50 mL) dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10, 200 mL

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: An aqueous solution of NaOH (30%, 240 mL) was added dropwise to a stirred solution of 4-iodobutane (110.5 g, 0.6 mol), p-toluenesulfonyl methyl isocyanide (58.6 g, 0.3 mol), and tetrabutylammonium iodide (8.0 g, 21.6 mmol) in CH2Cl2 (300 mL) at room temperature. The reaction mixture was stirred overnight and diluted with water (200 mL). The organic layer was separated and the aqueous layer was extracted with CH2Cl2 (3×100 mL). The organic layers were combined, washed with saturated NaCl solution (100 mL), dried over MgSO4, and concentrated in vacuo. The residue was taken up in diethyl ether (3×200 mL) and filtered. The filtrate was concentrated and purified by column chromatography (silica gel, ethyl acetate/hexanes=1:3) to give 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (65.7 g, 87%) as an oil. Under N2-atmosphere, sodium hydride (60% dispersion in mineral oil, 11.0 g, 0.275 mol) was added in portions to a solution of ethyl 7-bromo-2,2-dimethylheptanoate (72.8 g, 0.27 mol) and 1-(1-isocyanopentane-1-sulfonyl)-4-methylbenzene (69.0 g, 0.27 mol) in DMSO (500 mL) and diethyl ether (500 mL) at room temperature. After 30 min, tetrabutylammonium iodide (8.0 g, 21.7 mmol) was added and the mixture was stirred for 5 h. A precipitate formed and additional DMSO (500 mL) was added. After stirring overnight at room temperature, the mixture was heated to reflux for 3 h. Water (500 mL) and diethyl ether (500 mL) were added and the layers were separated. The aqueous layer was extracted with diethyl ether (4×200 mL). The combined organic layers were washed with water (500 mL) and saturated NaCl solution (300 mL), dried over MgSO4, and concentrated in vacuo to give crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g) as a dark oil, which was used without further purification. Concentrated, hydrochloric acid (200 mL) was added slowly to a solution of crude 8-isocyano-2,2-dimethyl-8-(toluene-4-sulfonyl)-dodecanoic acid ethyl ester (126.2 g, 0.29 mol) in methylene chloride (300 mL). The reaction mixture was stirred at room temperature for 4 h. Water (500 mL) was added. The aqueous layer was separated and extracted with methylene chloride (3×100 mL). The organic solutions were combined, washed with water (300 mL) and saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4. The solvent was evaporated and the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10) to yield 2,2-dimethyl-8-oxododecanoic acid ethyl ester (69.6 g, 89%) as an oil. 1H NMR (300 MHz, CDCl3/TMS): δ (ppm): 4.1 (q, J=7.3 Hz, 2H), 2.40-2.31 (m, 4H), 1.58-1.45 (m, 6H), 1.31-1.19 (m, 6H), 1.22 (t, 3H, J=7.3 Hz), 1.12 (s, 6H), 0.88 (t, J=7.3 Hz, 3H). 13C NMR (75 MHz, CDCl3/TMS): δ (ppm): 210.5, 178.0, 60.5, 42.5, 42.0, 30.0, 27.0, 26.0, 25.5, 24.0, 23.0, 14.5, 14.0. HRMS (LSIMS, gly): Calcd for C16H31O3 (MH+): 271.2273. found: 271.2275. HPLC: 84% pure. was used without further purification Concentrated The aqueous layer was separated extracted with methylene chloride (3×100 mL) washed with water (300 mL) saturated, aqueous NaHCO3 solution (200 mL) and dried over MgSO4 The solvent was evaporated the residue was purified by column chromatography (silica gel, ethyl acetate/hexanes=1:10)