Isolation, characterization, and NMR spectroscopic data of indole and oxindole alkaloids from Mitragyna speciosa

Tetrahedron Letters
2014.0

Abstract

A new indole alkaloid, 7 beta-hydroxy-7H-mitraciliatine (1) and a new oxindole alkaloid, isospeciofoleine (2) together with nine known alkaloids were isolated from Mitragyna speciosa and characterized by NMR, CD, and MS spectroscopic data analyses. The H-1 and C-13 NMR spectroscopic data of isospeciofoline (3), isorotundifoline (4), paynantheine (5), and 3-isopaynantheine (6) were also reported for the first time. (C) 2013 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.tetlet.2013.11.031

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