2,3,3a,4,5,6,7,7a-octahydroisoindol-1-one

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 7 g of (3aRS,4RS,7aSR)-2-benzyl-7,7-dimethoxy -4-(2-methoxyphenyl)-4-perhydroisoindolol in 70 cm3 of dry dichloromethane are added 6.5 cm3 of triethylamine and 6.5 cm3 of trifluoroacetic acid. After stirring for 3 hours at room temperature, the reaction mixture, cooled to +5° C., is basified with 50 cm3 of 1N sodium hydroxide. The organic phase is separated out, washed with water, dried over magnesium sulphate and then concentrated to dryness under reduced pressure (2.7 kPa). The oil obtained is crystallized in diisopropyl ether. The solid, washed with petroleum ether, is then drained and dried under reduced pressure at 40° C. 3.4 g of (3aRS,7RS,7aSR)-2-benzyl-7-hydroxy -7-(2-methoxyphenyl)-4)-perhydroisoindolone are obtained, in the form of a cream-coloured solid. M.p.=96C. the reaction mixture, cooled to +5° C. The organic phase is separated out washed with water dried over magnesium sulphate concentrated to dryness under reduced pressure (2.7 kPa) The oil obtained is crystallized in diisopropyl ether The solid, washed with petroleum ether dried under reduced pressure at 40° C

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 7 g of (3aRS,4RS,7aSR)-2-benzyl-7,7-dimethoxy -4-(2-methoxyphenyl)-4-perhydroisoindolol in 70 cm3 of dry dichloromethane are added 6.5 cm3 of triethylamine and 6.5 cm3 of trifluoroacetic acid. After stirring for 3 hours at room temperature, the reaction mixture, cooled to +5° C., is basified with 50 cm3 of 1N sodium hydroxide. The organic phase is separated out, washed with water, dried over magnesium sulphate and then concentrated to dryness under reduced pressure (2.7 kPa). The oil obtained is crystallized in diisopropyl ether. The solid, washed with petroleum ether, is then drained and dried under reduced pressure at 40° C. 3.4 g of (3aRS,7RS,7aSR)-2-benzyl-7-hydroxy -7-(2-methoxyphenyl)-4)-perhydroisoindolone are obtained, in the form of a cream-coloured solid. M.p.=96C. the reaction mixture, cooled to +5° C. The organic phase is separated out washed with water dried over magnesium sulphate concentrated to dryness under reduced pressure (2.7 kPa) The oil obtained is crystallized in diisopropyl ether The solid, washed with petroleum ether dried under reduced pressure at 40° C

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 7 g of (3aRS,4RS,7aSR)-2-benzyl-7,7-dimethoxy -4-(2-methoxyphenyl)-4-perhydroisoindolol in 70 cm3 of dry dichloromethane are added 6.5 cm3 of triethylamine and 6.5 cm3 of trifluoroacetic acid. After stirring for 3 hours at room temperature, the reaction mixture, cooled to +5° C., is basified with 50 cm3 of 1N sodium hydroxide. The organic phase is separated out, washed with water, dried over magnesium sulphate and then concentrated to dryness under reduced pressure (2.7 kPa). The oil obtained is crystallized in diisopropyl ether. The solid, washed with petroleum ether, is then drained and dried under reduced pressure at 40° C. 3.4 g of (3aRS,7RS,7aSR)-2-benzyl-7-hydroxy -7-(2-methoxyphenyl)-4)-perhydroisoindolone are obtained, in the form of a cream-coloured solid. M.p.=96C. the reaction mixture, cooled to +5° C. The organic phase is separated out washed with water dried over magnesium sulphate concentrated to dryness under reduced pressure (2.7 kPa) The oil obtained is crystallized in diisopropyl ether The solid, washed with petroleum ether dried under reduced pressure at 40° C

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To 3 (835 mg, 6 mmol) in suspension in tetrahydrofuran (7 mL) was successively added, under an argon atmosphere, 4-dimethylaminopyridine (18.3 mg; 0.15 mmol), triethylamine (0.84 mL; 6 mmol) and BOC2O (2.62 g; 12 mmol). The reaction mixture was stirred at room temperature for 3 days. The solvent was removed under vacuum. The residue was diluted with diethyl ether (20 mL) and washed with water (2×10 mL). The phases were separated, and the organic phase was dried over MgSO4 and concentrated. The crude oil was purified over silica gel chromatography (ether/heptane 1:1) to give 4 (986 mg; 4.1 mmol; 70%) as a white solid. The solvent was removed under vacuum The residue was diluted with diethyl ether (20 mL) washed with water (2×10 mL) The phases were separated the organic phase was dried over MgSO4 concentrated The crude oil was purified over silica gel chromatography (ether/heptane 1:1) to give 4 (986 mg; 4.1 mmol; 70%) as a white solid