(S)-alpha-ethyl-2-oxo-1-pyrrolidineacetamide, its preparation and pharmaceutical compositions containing the same. It can be prepared either by reacting (S)-alpha-ethyl-2-oxo-1-pyrrolidineacetic acid successively with an alkyl haloformate and with ammonia, or, by cyclizing an (S)-2-aminobutanamide of the formula X--CH.sub.2 CH.sub.2 --Y--NHCH(C.sub.2 H.sub.5)CONH.sub.2 wherein Y is a --CH.sub.2 -- radical when X represents a ZOOC-- radical and Y is a --CO-- radical when X represents a HalCH.sub.2 -- radical, Z being a C.sub.1 -C.sub.4 alkyl radical and Hal a halogen atom. This laevorotatory enantiomer has been found to have significantly higher protective activity against hypoxia and ischemia than the corresponding racemate.
(S)-α-乙基-2-氧代-1-
吡咯烷乙酰胺及其制备方法和含有该物质的药物组成物。该物质可通过(S)-α-乙基-2-氧代-1-
吡咯烷乙酸先与烷基卤代
甲酸酯反应,然后再与
氨反应来制备,或通过环化式X--CH.sub.2 CH.sub.2 --Y--NHCH(C.sub.2 H.sub.5)CONH.sub.2的(S)-2-
氨基丁酰胺来制备,其中当X表示ZOOC--基团时,Y为--CH.sub.2 --基团,当X表示HalCH.sub.2 --基团时,Y为--CO--基团,其中Z为C.sub.1-C.sub.4烷基基团,Hal为卤素原子。这种左旋对映体已被发现在缺氧和缺血保护方面具有显著的高活性,比相应的混合物更具优势。