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Synthesis of compounds 15a-b. Reagents and conditions: (a) (2-hydroxyphenyl)boronic acid, Pd(OAc)2, K2CO3, EGME/H2O, rt, 15 h, 84%; (b) n-hexyl-NCO, DMAP, MeCN, rt, 15 h, 88%; (c) 6M HCl, THF, rt, 2 d, 90%; (d) (4-hydroxyphenyl)boronic acid, Pd(OAc)2, K2CO3, EGME/H2O, rt, 15 h, 59%; (e) n-hexyl-NCO, DMAP, MeCN, rt, 15 h, 72%; (f) 6M HCl, THF, rt, 2 d, 46%.
