Total synthesis of calothrixins A and B via oxidative radical reaction of cyclohexenone with aminophenanthridinedione
作者:Su Xu、Thao Nguyen、Irene Pomilio、Maria C. Vitale、Sadanandan E. Velu
DOI:10.1016/j.tet.2014.06.021
日期:2014.9
N-oxide derivative calothrixin A have been synthesized via an oxidative free radical reaction. calothrixin B is generated from the commercially available 2,4,5-trimethoxybenzaldehyde in only 7 steps. The key step in this synthesis is the Mn(OAc)3 mediated oxidative free radical reaction of 9-(benzylamino)phenanthridine -7,10-dione with cyclohexenone to form 12-benzyl-12H-indolo[3,2-j]phenanthridine-7
通过氧化自由基反应合成了生物活性吲哚[3,2-j]菲啶生物碱,calothrixin B及其N-氧化物衍生物calothrixinA。calothrixin B由市售的2,4,5-三甲氧基苯甲醛仅用7个步骤生成。该合成的关键步骤是Mn(OAc)3介导的9-(苄氨基)菲啶-7,10-二酮与环己烯酮的氧化自由基反应,形成12-苄基-12H-吲哚并[3,2-j]菲啶-7,13-二酮。