(6,6-二甲基-1,4-二恶烷-2-基)甲醇

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

实验步骤: TEA (0.52 mL, 3.74 mmol) and (6,6-dimethyl-1,4-dioxan-2-yl)methanol (390 mg, 2.67 mmol) were dissolved in DCM (10 mL). Methanesulfonyl chloride (0.249 mL, 3.20 mmol) was slowly added at 0° C. After the addition was completed the solution was warmed to ambient temperature and stirred for 1 hr. Saturated NaHCO3 solution was added and the two layers were separated. The aqueous layer was extracted three times with DCM. The organic layers were combined, dried over Na2SO4 and concentrated. The resulting residue was purified on a silica gel column (heptane:EtOAc 4:1 to 1:1) to give the product as a colorless oil (584 mg, 98%). 1H NMR (400 MHz, CDCl3) δ ppm 4.00-4.09 (3H, m), 3.74 (1H, dd, J= 11.2, 2.8 Hz), 3.42 (1H, d, J= 11.6 Hz), 3.16-3.23 (2H, m), 2.99 (3H, s), 1.27 (3H, s), 1.05 (3H, s). After the addition the two layers were separated The aqueous layer was extracted three times with DCM dried over Na2SO4 concentrated The resulting residue was purified on a silica gel column (heptane:EtOAc 4:1 to 1:1)

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

实验步骤: 2-methyl-1-(oxiran-2-ylmethoxy)propan-2-ol (620 mg, 4.24 mmol) and 10-CSA (300 mg, 1.29 mmol) were dissolved in DCM (30 mL) and stirred at ambient temperature for 24 hr. Saturated NaHCO3 solution was added and the two layers were separated. The aqueous phase was extracted four times with DCM. The organic layers were combined, dried over Na2SO4 and concentrated. The resulting residue was purified on a silica gel column (heptane:EtOAc 1:0 to 1:2) to give the desired product as a colorless oil (400 mg, 64%>). Some starting material was recovered. 1H NMR (400 MHz, CDCl3) δ ppm 3.90-3.96 (1H, m), 3.76 (1H, dd, J= 11.2, 2.8 Hz), 3.56 (1H, dd, J= 11.6, 4.0 Hz), 3.46-3.50 (2H, m), 3.29 (1H, t, J= 11.2 Hz), 3.24 (1H, dd, J= 11.6, 1.2 Hz), 2.69 (1H, br s), 1.35 (3H, s), 1.13 (3H, s). the two layers were separated The aqueous phase was extracted four times with DCM dried over Na2SO4 concentrated The resulting residue was purified on a silica gel column (heptane:EtOAc 1:0 to 1:2)

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

实验步骤: TEA (0.52 mL, 3.74 mmol) and (6,6-dimethyl-1,4-dioxan-2-yl)methanol (390 mg, 2.67 mmol) were dissolved in DCM (10 mL). Methanesulfonyl chloride (0.249 mL, 3.20 mmol) was slowly added at 0° C. After the addition was completed the solution was warmed to ambient temperature and stirred for 1 hr. Saturated NaHCO3 solution was added and the two layers were separated. The aqueous layer was extracted three times with DCM. The organic layers were combined, dried over Na2SO4 and concentrated. The resulting residue was purified on a silica gel column (heptane:EtOAc 4:1 to 1:1) to give the product as a colorless oil (584 mg, 98%). 1H NMR (400 MHz, CDCl3) δ ppm 4.00-4.09 (3H, m), 3.74 (1H, dd, J=11.2, 2.8 Hz), 3.42 (1H, d, J=11.6 Hz), 3.16-3.23 (2H, m), 2.99 (3H, s), 1.27 (3H, s), 1.05 (3H, s). After the addition the two layers were separated The aqueous layer was extracted three times with DCM dried over Na2SO4 concentrated The resulting residue was purified on a silica gel column (heptane:EtOAc 4:1 to 1:1)

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

实验步骤: 2-methyl-1-(oxiran-2-ylmethoxy)propan-2-ol (620 mg, 4.24 mmol) and 10-CSA (300 mg, 1.29 mmol) were dissolved in DCM (30 mL) and stirred at ambient temperature for 24 hr. Saturated NaHCO3 solution was added and the two layers were separated. The aqueous phase was extracted four times with DCM. The organic layers were combined, dried over Na2SO4 and concentrated. The resulting residue was purified on a silica gel column (heptane:EtOAc 1:0 to 1:2) to give the desired product as a colorless oil (400 mg, 64%). Some starting material was recovered. 1H NMR (400 MHz, CDCl3) δ ppm 3.90-3.96 (1H, m), 3.76 (1H, dd, J=11.2, 2.8 Hz), 3.56 (1H, dd, J=11.6, 4.0 Hz), 3.46-3.50 (2H, m), 3.29 (1H, t, J=11.2 Hz), 3.24 (1H, dd, J=11.6, 1.2 Hz), 2.69 (1H, br s), 1.35 (3H, s), 1.13 (3H, s). the two layers were separated The aqueous phase was extracted four times with DCM dried over Na2SO4 concentrated The resulting residue was purified on a silica gel column (heptane:EtOAc 1:0 to 1:2)