Steric and complexation effects on the 1,4-addition reaction of lithium dimethylcuprate with rigid α,β-unsaturated ketones
作者:A.Samuel Vellekoop、Robin A.J. Smith
DOI:10.1016/s0040-4020(98)83052-4
日期:1998.9
Reaction of lithium dimethylcuprate with a series of substituted 10-methyl-1(9)-octal-2-ones in diethyl ether give 1,4-addition products with the same ring junction stereochemistry as the parent, unsubstituted α,β-unsaturated ketone. The reactivity of the system is modified by groups positioned axially and 1,3 with respect to the β-carbon of the enone. Alkoxy substituents are generally activating,
甲基二甲基碳酸锂与一系列取代的10-甲基-1(9)-辛-2-酮在乙醚中的反应生成1,4-加成产物,其环结立体化学与母体相同,未取代的α,β-不饱和酮。相对于烯酮的β-碳,通过轴向定位的基团和1,3修饰了系统的反应性。烷氧基取代基通常是活化的,特别是如果它们相对于引入的甲基是顺式的。