Two protocols for the generation of the (R)-enantiomers of α-alkyl α-formyl α-hydroxy ketones/esters in states of high enantiomeric purity are developed; the formyl functions of such compounds undergo Wittig condensations with ethoxycarbonylmethylenetriphenylphosphorane in dimethyl sulfoxide to afford the corresponding alkenes with high (E)-stereoselectivities and with e.e.s of 91–99%.
开发了两种以高对映体纯度的状态生成α-烷基α-甲酰基α-羟基酮/酯的(R)-对映体的方案;这类化合物的甲酰基官能团与乙氧基羰基亚甲基
三苯基膦在
二甲亚砜中进行Wittig缩合反应,得到相应的具有高(E)-立体选择性和ee值为91-99%的烯烃。