Formation and cycloaddition of nonstabilized N-unsubstituted azomethine ylides from (2-azaallyl)stannanes and (2-azaallyl)silanes
作者:William H. Pearson、Roger B. Clark
DOI:10.1016/s0040-4039(99)00744-3
日期:1999.6
Protodestannylation or protodesilylation of (2-azaallyl)stannanes or (2-azaallyl)silanes led to the formation of nonstabilized N-unsubstituted azomethine ylides, which underwent cycloadditions with electron-poor alkenes to produce 2-alkyl- or 2,5-dialkylpyrrolidines. 1,3-Disubstituted ylides derived from the stannanes and silanes gave stereochemically complementary results; the stannanes led to trans-2
(2-氮杂烯丙基)锡烷或(2-氮杂烯丙基)硅烷的原雌烯丙基化或原去甲硅烷基化导致形成未稳定的N-未取代的偶氮甲亚胺基化物,其与贫电子的烯烃进行环加成反应生成2-烷基-或2,5-二烷基吡咯烷酮。衍生自锡烷和硅烷的1,3-二取代的叶立德产生立体化学互补的结果;锡烷导致具有高立体选择性的反式-2,5-二烷基吡咯烷,而硅烷则导致具有中等立体选择性的顺式-2,5-二烷基吡咯烷。