Alkali metal-liquid ammonia reduction of γ-lactones to diols and cyclic hemiacetals: stereochemical influence by the neighbouring group on the nature
作者:Asit K. Chkraborty、Bijali Saha、Chhanda Ray、Usha Ranjan Ghatak
DOI:10.1016/s0040-4020(01)90319-9
日期:——
Lithium or sodium-liquid aimmonia reduction of 3-hydroxy-1,3-dimethylcyclohexane-1,3-carbolactones (, () and () with or without a C-2 equatorial substituent gives the respective diols (), () and (), whereas the lactones () and (), having a C-2 axial substituent produce the respective cyclic hemiacetals () and () as the sole products. A possible mechanism has been suggested for rationalisation of these
锂或钠-液体阿莫尼亚胺还原带有或不带有C-2赤道取代基的3-羟基-1,3-二甲基环己烷-1,3-碳内酯(,()和())分别得到二元醇(),()和(),而具有C-2轴向取代基的内酯()和()则分别产生各自的环状半缩醛()和(),为合理地解释这些结果提出了一种可能的机理。