Hydrocyanation. Part IX. Synthesis of β-cyano-aldehydes by conjugate hydrocyanation of allylideneamines followed by hydrolysis
作者:W. Nagata、M. Yoshioka、T. Okumura、M. Murakami
DOI:10.1039/j39700002355
日期:——
Conjugate hydrocyanation of αβ-unsaturated aldehydes with diethylaluminium cyanide or with hydrogen cyanide and an alkylaluminium was only successful with a substrate having a sterically hindered formyl group. Attempts to desulphurise β-cyano-thiocarboxylates to β-cyano-aldehydes failed. However, allylideneamines (I) carrying a bulky N-alkyl substituent reacted with hydrogen cyanide–alkylaluminium
αβ-不饱和醛与二乙基铝氰化物或与氰化氢和烷基铝的共轭氢氰化仅在具有空间位阻甲酰基的底物上才能成功。将β-氰基硫代羧酸盐脱硫为β-氰基醛的尝试失败。但是,带有大量N-烷基取代基的烯化亚胺(I)与氰化氢-烷基铝反应生成1,3-二氰基丙胺(II),然后将其水解为β-氰基醛(III),产率很高。作为副产物形成了2-亚氨基吡咯烷(IV)。