Enantiomerically pure, crystalline ‘anti’-aldols from N-acylbornanesultams: aldolization and structure of intermediate t-butyldimethylsilyl-N,O-ketene acetal.
作者:Wolfgang Oppolzer、Christian Starkemann、Inès Rodriguez、Gérald Bernardinelli
DOI:10.1016/s0040-4039(00)71218-4
日期:1991.1
O-Silylation of N-propionylsultam provides pure Z O-silyl-N,O-ketene acetal which undergoes Lewis acid promoted addition of aromatic and aliphatic aldehydes to give diastereomerically pure, crystalline “anti” aldols or their silylethers . Hydroperoxide-assisted hydrolysis/esterification of products yields enantiomerically pure methoxycarbonyl aldols (, , , ).
ø的-Silylation Ñ -propionylsultam提供纯ZO -silyl- N,O -ketene缩醛其经历路易斯酸促进加成的芳族和脂族醛,得到非对映异构纯的,结晶的“反”醛醇或它们的甲硅烷基醚。氢过氧化物辅助产品的水解/酯化收率对映体纯甲氧基羰基醛醇(,,,)。