A rapid stereocontrolled synthesis of the 3a-hydroxy-pyrrolo[2,3-b]indole skeleton, a building block for 10b-hydroxy-pyrazino[1′,2′:1,5]pyrrolo[2,3-b]indole-1,4-diones
Abstract
A two-step selenocyclisation–oxidative deselenation sequence was used to establish the 3a-hydroxy-pyrrolo[2,3-b]indole core; these tricycles were used as effective precursors to 10b-hydroxy-pyrazino[1′,2′:1,5]pyrrolo[2,3-b]indole-1,4-diones.