Tris(pentafluorophenyl)borane-promoted stereoselective glycosylation with trichloroacetimidate glycosyl donors is described. The reactions proceed efficiently with a wide range of acceptors, from sugar to nonsugar, under mild conditions in the presence of a catalytic amount of B(C6F5)3. The perbenzylated glucosyl α-imidate provides β-selective glycosides in 70–92% yields.
描述了用三氯乙酰亚胺酸酯糖基供体的三(五氟苯基)硼烷促进的立体选择性糖基化。在催化量的B(C 6 F 5)3存在下,在温和条件下,反应可利用各种受体(从糖到非糖)有效地进行。过苄基化的葡萄糖基α-亚氨酸酯以70-92%的产率提供β-选择性糖苷。