8-Benzyloxy-octan-1-ol

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Compound 2 (133 g, 0.5635 mol) was dissolved in 1.5 L of DCM, CBr4 (280.35 g, 0.8456 mol) was added into this stirring solution and reaction mixture was cooled to 0° C. under inert atmosphere. PPh3 (251.03 g, 0.957 μmol) was then added in portions keeping the temperature below 20° C. and after complete addition reaction was stirred for 3 h at room temperature and monitored by TLC. After completion of reaction, solid (PPh3O) precipitated out from the reaction mixture was filtered off and filtrate was diluted with crushed ice (˜1.5 kg) and extracted with DCM (3×750 mL). Organic layer was separated, dried over an Na2SO4 and distilled under vacuum. Resulting crude compound was chromatographed on 60-120 mesh silica gel column using 0-5% ethyl acetate in hexanes as eluting system to give compound (150 g, 89%) as pale yellow liquid. H1 NMR (400 MHz, CDCl3): δ=7.33-7.25 (m, 5H), 4.49 (s, 2H), 3.47-3.41 (m, 2H), 3.41-3.37 (m, 2H), 1.86-1.80 (m, 4H), 1.62-1.56 (m, 2H), 1.42-1.29 (m, 8H). the temperature below 20° C. after complete addition reaction After completion of reaction, solid (PPh3O) precipitated out from the reaction mixture was filtered off filtrate was diluted with crushed ice (˜1.5 kg) extracted with DCM (3×750 mL) Organic layer was separated dried over an Na2SO4 distilled under vacuum Resulting crude compound was chromatographed on 60-120 mesh silica gel column as eluting system

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Compound 240 (133 g, 0.5635 mol) was dissolved in 1.5 L of DCM, CBr4 (280.35 g, 0.8456 mol) was added to this stirring solution and the reaction mixture was cooled to 0° C. under an inert atmosphere. PPh3 (251.03 g, 0.9571 mol) was then added in portions maintaining the temperature below 20° C. and after complete addition, the reaction mixture was stirred for 3 hours at room temperature. After completion of reaction, solid (PPh3O) precipitated out from the reaction mixture was isolated by filtration and the filtrate was diluted with crushed ice (˜1.5 kg) and extracted with DCM (3×750 mL). The organic layer was separated, dried over anhydrous Na2SO4 and distilled under vacuum. The resulting crude compound was chromatographed on 60-120 mesh silica gel column using 0-5% ethyl acetate in hexanes as eluting system to afford compound 241 (150 g, 89%) as pale yellow liquid. 1H NMR (400 MHz, CDCl3): δ=7.33-7.25 (m, 5H), 4.49 (s, 2H), 3.47-3.41 (m, 2H), 3.41-3.37 (m, 2H), 1.86-1.80 (m, 4H), 1.62-1.56 (m, 2H), 1.42-1.29 (m, 8H). maintaining the temperature below 20° C. after complete addition After completion of reaction, solid (PPh3O) precipitated out from the reaction mixture was isolated by filtration extracted with DCM (3×750 mL) The organic layer was separated dried over anhydrous Na2SO4 distilled under vacuum The resulting crude compound was chromatographed on 60-120 mesh silica gel column as eluting system

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

实验步骤: The title compound, m/e=377.6 ([M−H]−), was produced in analogy with intermediate 1, steps 1 to 4. Thus, 1,8-octanediol was alkylated in step 1 with benzyl bromide, leading to 8-benzyloxy-octan-1-ol, which was oxidized in step 2 to 8-benzyloxy-octanoic acid. This was coupled in step 3 with (R)-3-amino-4-dimethylamino-butyric acid benzyl ester dihydrochloride to produce (R)-3-[8-benzyloxy)-octanoylamino]-4-dimethylamino-butyric acid benzyl ester, which was hydrogenated in step 4.

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

实验步骤: The title compound, m/e=377.6 ([M−H]−), was produced in analogy with example 1, steps 1 to 4. Thus, 1,8-octanediol was alkylated in step 1 with benzyl bromide, leading to 8-benzyloxy-octan-1-ol, which was oxidized in step 2 to 8-benzyloxy-octanoic acid. This was coupled in step 3 with (R)-3-amino-4-dimethylamino-butyric acid benzyl ester dihydrochloride to produce (R)-3-[8-benzyloxy)-octanoylamino]-4-dimethylamino-butyric acid benzyl ester, which was hydrogenated in step 4.

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Compound 2 (133 g, 0.5635 mol) was dissolved in 1.5 L of DCM, CBr4 (280.35 g, 0.8456 mol) was added to this stirring solution and the reaction mixture was cooled to 0° C. under an inert atmosphere. PPh3 (251.03 g, 0.9571 mol) was then added in portions maintaining the temperature below 20° C. and after complete addition, the reaction mixture was stirred for 3 hours at room temperature. After completion of reaction, solid (PPh3O) precipitated out from the reaction mixture was isolated by filtration and the filtrate was diluted with crushed ice (˜1.5 kg) and extracted with DCM (3×750 mL). The organic layer was separated, dried over anhydrous Na2SO4 and distilled under vacuum. The resulting crude compound was chromatographed on 60-120 mesh silica gel column using 0-5% ethyl acetate in hexanes as eluting system to afford compound 3 (150 g, 89%) as pale yellow liquid. 1H NMR (400 MHz, CDCl3): δ=7.33-7.25 (m, 5H), 4.49 (s, 2H), 3.47-3.41 (m, 2H), 3.41-3.37 (m, 2H), 1.86-1.80 (m, 4H), 1.62-1.56 (m, 2H), 1.42-1.29 (m, 8H). maintaining the temperature below 20° C. after complete addition After completion of reaction, solid (PPh3O) precipitated out from the reaction mixture was isolated by filtration extracted with DCM (3×750 mL) The organic layer was separated dried over anhydrous Na2SO4 distilled under vacuum The resulting crude compound was chromatographed on 60-120 mesh silica gel column as eluting system

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

实验步骤: The title compound, m/e=377.6 ([M−H]−), was produced in analogy with intermediate 1, steps 1 to 4. Thus, 1,8-octanediol was alkylated in step 1 with benzyl bromide, leading to 8-benzyloxy-octan-1-ol, which was oxidized in step 2 to 8-benzyloxy-octanoic acid. This was coupled in step 3 with (R)-3-amino-4-dimethylamino-butyric acid benzyl ester dihydrochloride to produce (R)-3-[8-benzyloxy)-octanoylamino]-4-dimethylamino-butyric acid benzyl ester, which was hydrogenated in step 4.