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Synthesis of Class A & B compounds. (A) Synthesis of precursors. (B) Synthesis of Class A. (C) Synthesis of Class B. Reagents and conditions: (a) morpholine, K2CO3, ACN, room temperature, overnight; (b) BuLi, DMF, THF, −78 °C, 1 h; (c) aniline, InCl3, NaBH4, ACN, 20 min; (d) 3,4-dimethoxybenzenesulfonyl chloride, K2CO3, DCM, overnight; (e) cyclobutylamine, NaBH4, MeOH, overnight.
