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Synthesis of compound 18b. Reagents and conditions: (a) MeOH, conc. H2SO4, rt, 15 h, quant.; (b) (3-hydroxyphenyl)boronic acid, Pd(OAc)2, K2CO3, EGME/H2O, rt, 15 h, 71%; (c) n-hexyl-NCO, DMAP, MeCN, rt, 15 h, 64%; (d) 6M HCl, THF, rt, 2 d, 62%.
