Michael Addition and Alkylation of 2-Azaallyl Anions Derived from<i>N</i>-(1-Cyanoalkyl)imines, and Stereoselective Cyclization of Imine Esters or Ketones Leading to 1-Pyrrolines
作者:Otohiko Tsuge、Kazunori Ueno、Shuji Kanemasa、Kiyotaka Yorozu
DOI:10.1246/bcsj.60.3347
日期:1987.9
The 2-azaallyl anions derived from N-(1-cyanoalkyl)imines and DBU undergo Michael addition or alkylation to produce N-(1-alkylated 1-cyanoalkyl)imines. The Michael addition of some aryl-substituted imines are highly diastereoselective. The alkylated Michael adducts are converted into lactams through a hydrolysis and recyclization sequence. Base-induced cyclization furnishes 1-pyrrolines through a cyclization
衍生自 N-(1-氰基烷基)亚胺和 DBU 的 2-氮杂烯丙基阴离子经历迈克尔加成或烷基化以产生 N-(1-烷基化 1-氰基烷基)亚胺。一些芳基取代的亚胺的迈克尔加成是高度非对映选择性的。烷基化迈克尔加合物通过水解和再循环序列转化为内酰胺。碱基诱导的环化通过环化和 HCN 消除序列提供 1-吡咯啉。在后一个反应中,当加合物在碘化锂存在下用 LDA 处理时,会选择性地产生 4,5-cis-1-吡咯啉。