Superarming of Glycosyl Donors by Combined Neighboring and Conformational Effects
摘要:
A novel glycosyl donor that combines the concepts of both conformational and electronic superarming has been synthesized. The reactivity and selectivity of the donor have been tested in competition experiments.
approach to regioselectivebenzylation of carbohydrate trans-diols was developed, where 0.1 equiv. of Bu2SnCl2 and 0.1 equiv. of TBABr were used as the catalysts and 2.0 equiv. of BnCl was used as the benzylationreagent. In most cases, similar or better benzylationregioselectivities and isolated yields were obtained by using catalyticamounts of Bu2SnCl2, rather than stoichiometric amounts of organotin