An Enantioselective ?-Lactam Synthesis Starting fromL-(S)-Glyceraldehyde Acetonide
作者:Christian Hubschwerlen、G�rard Schmid
DOI:10.1002/hlca.19830660732
日期:1983.11.2
Complete diastereoselectivity is observed during the cyclocondensation of activated glycine derivatives with aldimines derived from L-(S)-glyceraldehyde acetonide. 3,4-cis-β-lactams are isolated in high optical and chemical yields. They are converted into key intermediates used in the syntheses of various mono- and bicyclic β-lactam antibiotics. A mechanism is suggested to explain this remarkable
在活化的甘氨酸衍生物与衍生自L- (S) -甘油醛丙酮化物的醛亚胺的环缩合过程中观察到完全的非对映选择性。以高光学和化学收率分离出3,4-顺-β-内酰胺。它们被转化为用于合成各种单环和双环β-内酰胺抗生素的关键中间体。建议一种机制来解释这种非对映选择性。