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The synthesis of trichloroacetimidate sugar donors. Reagents and conditions: (a) BzCl, pyridine, rt, 18 h; (b) 33% HBr-HOAc, DCM, rt, 5 h; (c) Ag2O, acetone, H2O, rt, 3 h; (d) CCl3CN, K2CO3, DCM, rt, 6 h, yield: 76% (10a), 65% (10b) for four steps.
