Acetic anhydride to the rescue: Facile access to privileged 1,2,3,4-tetrahydropyrazino[1,2-a]indole core via the Castagnoli-Cushman reaction
Keywords: Castagnoli-Cushman reaction; Dicarboxylic acids; In situ cyclodehydration; Acetic anhydride; trans-Diastereoselectivity; Vicinal coupling constants;