Stéréosélectivité et régiosélectivité de la réduction des cyclopropènes-2,3 et méthylène-2 cyclopropanes fonctionalisés en position 1
作者:M. Vincens、C. Dumont、M. Vidal、I.N. Domnin
DOI:10.1016/s0040-4020(01)88652-x
日期:1983.1
Reduction of 2 cyclopropenyl esters and alcohols with lithium aluminium hydride is selective; at low temperatures (0°) the double bond is not reduced, but at higher temperatures (65°) the reduction is complete and only the cyclopropylmethanol is obtained. The reduction of the double bond is regioselective (the most stable carbanion is formed) and stereospecific (the hydride attack on the double bond
用氢化铝锂选择性还原2种环丙烯基酯和醇;在低温(0°)下,双键不会还原,但在更高温度(65°)下,还原会完成,仅会得到环丙基甲醇。双键的还原是区域选择性的(形成了最稳定的碳负离子),并且是立体特异性的(氢化物对双键的攻击发生在官能团的顺式)。可以通过最初形成氢化烷氧基硅铝,然后分子内还原双键来解释这种立体特异性。在官能化的亚甲基环丙烷的还原中也获得了相似的结果。