Stereoselective routes to substituted β-amino carbonyl compounds via heterodiene [4π+2π] cycloadditions of auxiliary-based C2 symmetric ketene acetals
作者:Peter Leeming、Colin A Ray、Stephen J Simpson、Timothy W Wallace、Richard A Ward
DOI:10.1016/s0040-4020(02)01523-5
日期:2003.1
Heterodiene [4π+2π] cycloadditions of (S,S)-4,5-diaryl-2-methylene-1,3-dioxolanes 1 to a series of β-amido-α,β-unsaturated carbonyl compounds are diastereoselective (d.r.≥4:1). The products can be purified by trituration or crystallisation and hydrolysed with acid to generate the corresponding β-amido carbonyl compounds, the overall sequence effecting an auxiliary-based enantioselective conjugate addition
(S,S)-4,5-二芳基-2-亚甲基-1,3-二氧戊环1的杂二烯[4π+2π]环加成到一系列β-酰胺基-α,β-不饱和羰基化合物上是非对映选择性的(dr≥ 4:1)。可以通过研磨或结晶纯化产物,并用酸水解以产生相应的β-酰胺基羰基化合物,整个序列实现乙酸烯醇酯的基于辅助的对映选择性共轭加成,从而产生β-氨基酸衍生物。