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Glycosylation of 15 with pyrimidines. Reagents and conditions: (a) 1 equiv 15, 4 equiv base (BH= uracil, thymine, N4-acetylcytosine, and 5-fluorouracil), 6 equiv BSA, MeCN, 80 °C, 1 h; (b) 2.7 equiv TMSOTf, 0–80 °C, 30 min, 78–85% over two steps.
