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Synthesis of Indole Alkaloids via Friedel-Crafts Acylation of Bridged Amides: a) Quebrachamine by Ziegler and Bosch; b) Dihydrocleavamine by Bosch and Lesma; c) Tabersonine by Ziegler; d) Cleavamine by Hanaoka (please use double-column format for Scheme 180)
