A tandem cross-coupling reaction of ketones with aldehydes has been achieved using barium hydride or isopropoxide as a promoter, in which barium enolates are generated in situ and then three successive reactions (aldol reaction-β-elimination-Michael addition) follow; this one-pot process is effective for obtaining symmetrical 1,5-diketones in good yields.
利用
氢化钡或
异丙醇作为
促进剂,实现了酮与醛的串联交叉偶联反应,在该反应中,原位生成了
钡烯醇,随后发生了三个连续反应(醛醇反应-δ-消除-迈克尔加成);这一单锅工艺可有效地获得对称的 1,5-二酮,且收率高。