Synthesis of δ-Ketonic and δ-Thioacetalated Phosphonium Salts and Their Use in Wittig Reactions for Carbonyl n + 4 Homologation
作者:Henri-Jean Cristau、Yves Beziat、Claude Ekissi Niangoran、Henri Christol
DOI:10.1055/s-1987-28036
日期:——
The δ-thioacelalated phosphonium salts 4 are obtained by addition of triphenylphosphine on cyclopropylketones 2 followed by carbonyl thioacetalization. The corresponding ylides are converted into 2-(3′-alkenyl)-1, 3-dithianes 6 with predominant Z-stereochemistry in good yields.
δ-硫缩醛化的磷盐4是通过三苯基膦与环丙基酮2的反应后进行羰基硫缩醛化获得的。相应的盐基被转化为具有主要Z-立体化学的2-(3'-烯基)-1,3-二硫烷6,产率较高。