New Sesquiterpene Lactones from Montanoa tomentosa subsp. xanthiifolia*

Ana Lidia-Pérez; María Beda Aída Caballero; Alfredo Ortega; Rubén Gaviño; Alfonso Romo de Vivar

doi:10.1055/s-2006-959472

Planta Medica, Inhaltsverzeichnis

Planta Med 1994; 60(3): 263-266
DOI: 10.1055/s-2006-959472

Paper

New Sesquiterpene Lactones from Montanoa tomentosa subsp. *xanthiifolia**

Ana Lidia-Pérez, María Beda Aída Caballero, Alfredo Ortega, Rubén Gaviño, Alfonso Romo de Vivar

Instituto de Química, Universidad Nacional Autónoma de México, Ciudad Universitaria, Circuito Exterior, Coyoacán, 04510 México, D.F.

* Contribution No. 1207 of the Institute de Química, UNAM

Abstract

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Abstract

A chemical examination of Montanoa tomentosa subsp. xanthiifolia afforded in addition to some known compounds, four new sesquiterpene lactones: 4β,5α-epoxy-8α-isobutyryloxy-trans-germacr-1(10)-en-12,6β-olide (1a), 4β,5α-epoxy-7α-hydroxy-8α-isobutyryloxy-trans-germacr-1(10)-en-12,6β-olide (1b), (1R,4S)-1,5-cyclo-5α-hydroxy-8α-isobutyryloxy-7α, 10α-oxagermacran-12,6β-olide (2a), and 4β-hydroxy-8α-isobutyryloxy-7α,10α-oxaguaian-12,6β-olide (3). The structures were determined mainly by spectroscopic methods. The structure of 1b was confirmed by an X-ray analysis.

Key words

Montanoa tomentosa subsp. xanthiifolia - Compositae - sterols - triterpenes - germacranolides - guaianolides

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