反应详情

A solution of 5 g (16.31 mmol) of (±)-(2-chloro-phenyl)-(6,7-dihydro-4H-thieno[3,2-c]pyrid-5-yl)acetamide (prepared as given in Examples 10-15) and 4.15 g (16.2 mmol) (1S) (+)-camphor-10-sulphonic acid monohydrate in 100 mL acetone was stirred at room temperature for 20 h. Subsequently it was kept for 1 week in a freezer. Few crystals appeared concentration of volume by evaporating solvent under reduced pressure and repeated recrystallization in freezer for few days gave 3.3 g (75% yield) of (S)-2-(2-chloro-phenyl)-(4,5,6,7-tetrahydrothieno[3,2-c]pyrid-5-yl)acetamide (+)-camphor sulfonic acid salt. The salt was further purified by recrystallization in acetone, until constant specific optical rotation was obtained.

1. waitSubsequently it was kept for 1 week in a freezer
2. customby evaporating solvent under reduced pressure
3. customrecrystallization in freezer for few days