The cross-aldol reaction between a ketone and an aldehyde proceeded smoothly with threo diastereoselection favorably mediated by ytterbium trifluoromethanesulfonate and tertiary amine in diethyl ether or in dichloromethane. A ytterbium enolate was trapped with chlorotrimethylsilane to afford a silyl enol ether.
在二
乙醚或
二氯甲烷中,通过
三氟甲磺酸镱和叔胺的介导,酮和醛之间的交叉羟醛反应顺利进行,形成了具有良好立体选择性的threo异构体。通过用三
甲基氯硅烷捕获
镱烯醇盐,得到了烯醇
硅醚产物。