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DOI: 10.1055/s-0030-1250584
© Georg Thieme Verlag KG Stuttgart · New York
Antileishmanial Germacranolides from Calea zacatechichi
Publication History
received Sept. 30, 2010
revised October 25, 2010
accepted Nov. 2, 2010
Publication Date:
02 December 2010 (online)
Abstract
Phytochemical study of the leaves and stems of Calea zacatechichi Schl. (Asteraceae) led to the isolation of a series of six germacranolides (1–6) with significant antileishmanial activity. The structure of a new compound named by us as calealactone D (1) was determined by NMR and MS, and its absolute configuration by X‐ray crystallography. In addition, calealactone E (5) was discovered as a new naturally occurring compound, and the absolute configuration of calealactone C (2) was also determined by X‐ray crystallography. All compounds were biologically evaluated in antimicrobial and antiprotozoal assays.
Key words
Calea zacatechichi Schl. - Asteraceae - calealactone D - antileishmanial activity - crystal structure
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