Stereoselectivity of Cydoaddition of<i>N</i>-(Cyanomethyl)- and<i>N</i>-(α-Cyanobenzyl)imines with Olefinic Dipolarophiles. Synthetic Equivalents of Nitrile Ylide 1,3-Dipoles
作者:Otohiko Tsuge、Kazunori Ueno、Shuji Kanemasa、Kiyotaka Yorozu
DOI:10.1246/bcsj.59.1809
日期:1986.6
N-(Cyanomethyl)- and N-(α-cyanobenzyl)imines derived from a variety of aldehydes and ketones can tautomerize into N-protonated azomethine ylides which undergo cycloadditions with olefinic dipolarophiles. These cycloadditions are often accompanied by the elimination of HCN, mostly in a stereospecific manner, showing these imines to be synthetic equivalents of nonstabilized nitrile ylides. Stereoselectivity
衍生自各种醛和酮的 N-(氰基甲基)-和 N-(α-氰基苄基)亚胺可以互变异构为 N-质子化的偶氮甲碱叶立德,后者与烯属偶极体发生环加成反应。这些环加成通常伴随着 HCN 的消除,主要是以立体有择的方式,表明这些亚胺是不稳定的腈叶立德的合成等价物。讨论了环加成的立体选择性。