Asteriscunolides A,B, C and D,the first humulanolides; Two pairs of conformationally stable stereoisomers期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Asteriscunolides A,B, C and D,the first humulanolides; Two pairs of conformationally stable stereoisomers

Authors:	A San Feliciano AF Barrero M Medarde JM Miguel del Corral A Aramburu Aizpiri F Sánchez-Ferrando

Institution:	Departamento de Química Orgánica y Farmaceútica. Facultad de Farmacia. Salamanca Barcelona Spain;Departamento de Química Orgánica. Facultad de Ciencias. Universidad Autónoma. Bellaterra Barcelona Spain

Abstract:	Following a preliminary comunication on Asteriscunolide A (the first reported natural humulanolide), three more configurationally and/or conformationally isomeric Asteriscunolides ( B, C and D ) from the same plant ( $Asteriscus aquaticus$ L.) are described. The absolute configurations and the stable conformations of all four Asteriscunolides are established by an array of spectroscopic methods (CD, ¹H and ¹³C NMR) without resorting to X ray analysis.

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