名称:
Stereocontrolled construction of 4,5-dihydropyrrolo[1,2-a]quinoxaline scaffolds via chiral phosphoramidate catalyzed Pictet–Spengler-type reaction
摘要:
An efficient catalytic asymmetric synthesis of 4,5-dihydropyrrolo[1,2-a]quinoxalines has been developed on the basis of the Pictet-Spengler-type condensation of 1-(2-aminophenyl)pyrrole with a wide range of aldehydes. Structurally diverse 4,5-dihydropyrrolo[1,2-a]quinoxaline derivatives were obtained from 1-(2-aminophenyl)pyrrole and both aromatic and aliphatic aldehydes in good yields with moderate to good enantioselectivities upon treatment with chiral phosphoramidate catalyst IVb. (C) 2016 Elsevier Ltd. All rights reserved.