Scheme 2.
Synthesis of compounds A1–A6, A8–A12, A14, A16, A18, A19, A21–A27 and 19. Reagents and conditions: (a) CuI, CsCO3, DMF, rt, overnight, 55%–90%; (b) BBr3/DCM, DCM, −10 °C to rt, 24–36 h, 35%–64%.
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