Scheme 1.
Synthesis of Compounds 25–43a
aReagents and conditions: (a) glacial acetic acid, 80 °C; (b) Et3N, aroyl chloride, dry dichloromethane, rt, overnight; (c) stannous chloride dihydrate, 37% HCl, EtOH, rt, overnight.
Synthesis of Compounds 25–43a
aReagents and conditions: (a) glacial acetic acid, 80 °C; (b) Et3N, aroyl chloride, dry dichloromethane, rt, overnight; (c) stannous chloride dihydrate, 37% HCl, EtOH, rt, overnight.