beta-Selective C-Mannosylation of Electron-Rich Phenols

[摘要]：The reaction of tetra-O-benzylmannosyl trichloroacetimidate with electron-rich phenols in the presence of TMSOTf surprisingly leads to the exclusive formation of aryl beta-C-glycosides while a preference for the alpha-anomer could be observed with other Lewis acids such as ZnCl2.

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