反应详情

Solutions of 35.8 g of di-O-benzoyl-L-tartaric acid in 150 ml methanol and 19.1 g of 1-phenyl-2-(1-pyrrolidinyl)-ethanol in 100 ml of methanol were mixed and the mixture left standing in a refrigerator for 2 days. The crystalline product was filtered off, washed with a small amount of cold methanol and diethyl ether and dried. The product was repeatedly recrystallised from hot ethanol, yielding an optically pure diastereomeric salt of 15.0 g. The free base was released by dissolving the salt in 100 ml of cold 20% aqueous sodium hydroxide and extracted in dichloromethane. After evaporation of the solvent, 7.2 g (38% based on the starting racemate) of the oily (R)-enantiomer of 1-phenyl-2-(1-pyrrolidinyl)-ethanol were obtained which solidified after storage in a refrigerator to become a crystalline mass. The product had a [αD20] value of −40° (methanol).

1. waitthe mixture left
2. filtrationThe crystalline product was filtered off
3. washwashed with a small amount of cold methanol and diethyl ether
4. customdried
5. customThe product was repeatedly recrystallised from hot ethanol
6. customyielding an optically pure diastereomeric salt of 15.0 g
7. extractionextracted in dichloromethane
8. customAfter evaporation of the solvent, 7.2 g (38%
9. customwere obtained which