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Reagents and conditions: (a) BOMCl, DBU, DMF, 0°C, 1 h, 64%; (b) K2CO3, MeOH, 0°C, 50 min, 97%; (c) NBS, DMSO, 60°C, 1.5 h, 74%; (d) 28% NH3aq, THF, 50°C, 48 h, quant.; (e) TBAF, THF, rt, 3 h, 91%; (f) 20% Pd(OH)2-C, HCOONH4, EtOH-AcOH, reflux, 3.5 h, 55%.
