as an original chirality source. The direct chromatographic separation of two diastereomeric phosphine oxides on silica gel enabled these ligands to be easy available, allowing further structural and electronic modifications. Preliminary application of these Indole-azepinaps has been demonstrated in a Pd-catalyzed asymmetric allylic alkylation with high yields and moderate enantioselectivities.
已经通过使用l-丙
氨酸作为原始手性来源制备了一系列轴向手性含氮杂七元环 P,N-
配体(命名为 Indole-azepinap)。两种非对映氧化膦在
硅胶上的直接色谱分离使这些
配体易于获得,允许进一步的结构和电子修饰。这些 Indole-azepinaps 的初步应用已在 Pd 催化的不对称烯丙基烷基化中得到证明,收率高,对映选择性适中。