反应详情

1.5 g of ethyl (R/S)-2-(3-hydroxy-2-oxo-1-pyrrolidinyl)propionate are left to stand at room temperature for 24 hours with 2.45 g of cis-2-(2,6-dimethyl-1-piperidinyl)ethylamine. Thereafter, the excess cis-2-(2,6-dimethyl-1-piperidinyl)ethylamine is distilled off in a high vacuum and the residue (3.5 g) is chromatographed on 30 g of silica gel (granular size 0.2-0.5 mm). The (R/S)-cis-N-[2-(2,6-dimethyl-1-piperidinyl)ethyl]-2-(3-hydroxy-2-oxo-1-pyrrolidinyl)propionamide which is eluted with methanol has a melting point of 129°-130° after recrystallization from ethyl acetate.

1. distillationThereafter, the excess cis-2-(2,6-dimethyl-1-piperidinyl)ethylamine is distilled off in a high vacuum
2. customthe residue (3.5 g) is chromatographed on 30 g of silica gel (granular size 0.2-0.5 mm)
3. washThe (R/S)-cis-N-[2-(2,6-dimethyl-1-piperidinyl)ethyl]-2-(3-hydroxy-2-oxo-1-pyrrolidinyl)propionamide which is eluted with methanol
4. customafter recrystallization from ethyl acetate