Two novel indole alkaloids, Kopsiyunnanines A and B, from a Yunnan Kopsia

Tetrahedron Letters
2008.0

Abstract

Two novel indole alkaloids having unusual skeletons were isolated from the aerial part of Yunnan Kopsia arborea. Kopsiyunnanine A (1) is a new class of bisindole alkaloid composed of vallesiachotamine (modified Corynanthe-type) and Aspidospermatan-type alkaloids. Kopsiyunnanine B (2) is a new Corynanthetype oxindole alkaloid rearranged by D ring rotation.

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