The asymmetric synthesis of α-substituted α-methyl and α-phenyl phosphonic acids: Design, carbanion geometry, reactivity and preparative aspects of chiral alkyl bicyclic phosphonamides
作者:Youssef L. Bennani、Stephen Hanessian
DOI:10.1016/0040-4020(96)00829-0
日期:1996.10
The design, preparation, structural and spectroscopic analyses of topologically unique and enantiomerically pure alkyl phosphonamides are described. In the case of α-ethyl and α-benzyl phosphonamides, the geometry of both the secondary and tertiary carbanions was determined to be planar through deprotonation/deuteration/alkylation experiments. Stereoselective alkylations of such systems proceeded in
描述了拓扑独特和对映体纯的烷基膦酰胺的设计,制备,结构和光谱分析。在α-乙基和α-苄基膦酰胺的情况下,通过去质子化/氘代/烷基化实验,确定了仲和叔碳负离子的几何形状均为平面。这种系统的立体选择性烷基化以高收率和高非对映选择性进行。水解所得的α,α-烷基膦酰胺,得到具有高对映体纯度的相应的α,α-烷基膦酸。