β-unsaturated ketones and aldehydes under the catalysis of silica gel. The 1,4-selectivity is satisfactorily high even in the reductions of polyenes conjugated to a carbonyl group. Methyl substituent at an olefinic position (α or β to the carbonyl group) retards the reduction. The reduction can be used as a useful tool in obtaining building blocks for the syntheses of terpenoids and their derivatives.
Hantzsch 酯在
硅胶的催化下还原 α,β-不饱和酮和醛中的碳碳双键。即使在还原与羰基共轭的多烯时,1,4-选择性也令人满意。烯基位置(羰基的α或β)的甲基取代基会阻碍还原。还原可用作获得用于合成
萜类化合物及其衍
生物的构件的有用工具。