A modular synthesis of P-chirogenic α-alkoxyphosphine ligands has been developed, allowing for the variation of two of the three groups on phosphorus. Oxidation and concomitant desymmetrization of a prochiral alkyl- or aryldimethylphosphine borane afforded α-hydroxyphosphines, which were subsequently deprotonated and alkylated in a parallel fashion. The choice of base and temperature for the alkylation
已经开发了P-手性α-烷氧基
膦配体的模块合成,其允许
磷上的三个基团中的两个发生变化。前手性烷基或芳基二
甲基膦硼烷的氧化和伴随的脱对称化得到α-羟基膦,其随后以平行方式被去质子化和烷基化。发现烷基化步骤的碱和温度的选择对于反应的结果至关重要。随后在
钯催化的烯丙基取代中筛选选择的
配体,以良好至优异的产率提供产物,但对映选择性适中,这表明需要进一步优化
配体结构以增加立体选择性。