Organoaluminium reagents R2AlX (X=SPh, SeMe) easily add to α,β-unsaturated carbonyl compounds in 1,4-fashion. The resulting aluminium enolates react with aldehydes to give aldol adducts in fair to good yields. Formal elimination of HX from the adducts provides α-substituted α,β-unsaturated carbonyl compounds. The overall transformation is an addition of aldehydes to 1-acylethenyl anion equivalent. Diethylaluminium iodide also is found to be an efficient reagent for the same type transformation.
有机铝试剂R2AlX(X=
SPh,SeMe)能够以1,4-的方式容易地加成到α,β-不饱和羰基化合物上。生成的铝烯醇盐与醛反应,以较好至良好的产率得到醛醇加合物。通过形式上的HX消除反应,从加合物中可以得到α-取代的α,β-不饱和羰基化合物。整个转化过程相当于醛对1-酰基
乙烯基负离子等价物的加成。
二乙基铝
碘也被发现是实现这种类型转化的有效试剂。