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Reagents and conditions: (a) for 10, BzCl, pyr, 0 °C, 85%; for 15, PvCl, DMAP, pyr, 0 °C to rt, 81%; for 16, butyryl chloride, pyr, 0 °C to rt, 68%; for 17, p-methoxybenzoyl chloride, pyr, 0 °C, 72%; for 18, 2,4,6-trimethylbenzoyl chloride, N,N-diisopropylethylamine, MeCN, rt, 21%; for 19, benzenesulfonyl chloride, pyr, 0 °C to rt, 40%; (b) BzCl, pyr, CH2Cl2, 0 °C, 59%.
