Facile preparation of the α-C-vinyl and -aryl glycosides has been developed via mild Ni-catalyzed reductive vinylation and arylation of C1-glycosyl halides with vinyl/aryl halides. Good to high α-selectivities were achieved for C-glucosides, galactosides, maltoside, and mannosides, which were dictated by the employment of pyridine type ligands. As such, the present work represents unprecedented control
                                    通过温和的Ni催化还原性
乙烯基化和C1-糖基卤化物与
乙烯基/芳基卤化物的芳基化,已经开发出了制备α- C-
乙烯基和-芳基糖苷的简便方法。对于C-
葡萄糖苷,半乳糖苷,
麦芽糖苷和
甘露糖苷,具有良好或较高的α选择性,这是由
吡啶类
配体的使用决定的。这样,本发明代表了使用交叉偶联方法对C-
乙烯基葡糖苷的高
水平α-选择性的空前控制,并且通过催化剂控制的偶联策略提供了迄今为止最优化的C-芳基
葡糖苷的α-选择性制备。