TiCl4-promoted aldol reaction of ketones as aldol acceptors followed by elimination of the titanoxy group from the Ti-aldolates affords β,β-disubstituted α,β-unsaturated carbonyl compounds in a one-pot procedure. The use of additives, such as DMF, N,N,N′,N′-tetramethylethylenediamine, and pyridine, in the elimination step was found to be important.
TiCl 4促进的酮作为醛醇受体的醛醇
缩醛反应,然后从Ti-醛醇酸酯中消除
钛氧基,可以一锅法制得β,β-二取代的α,β-不饱和羰基化合物。发现在消除步骤中使用添加剂,例如
DMF,N,N,N ',N'-
四甲基乙二胺和
吡啶是重要的。