来自椭圆叶蜜茱萸的一种黄酮类化合物的两种晶体多晶型物。

Two crystal polymorphs of a flavonoid from Melicope ellyrana.

作者信息

Smith G, Bartley J P, Wang E, Bott R C

机构信息

Centre for Instrumental and Developmental Chemistry, Queensland University of Technology, GPO Box 2434, Brisbane 4001, Australia.

出版信息

Acta Crystallogr C. 2001 Nov;57(Pt 11):1336-7. doi: 10.1107/s0108270101013695. Epub 2001 Nov 13.

DOI:10.1107/s0108270101013695

PMID:11706267

Abstract

The crystal structure determinations of two crystalline components of the hexane extract of the fruit of the indigenous Australian tree Melicope ellyrana have shown them to be polymorphs of the same compound, namely the flavonoid 4',5-dihydroxy-3,3',8-trimethoxy-7-(3-methylbut-2-enyloxy)flavone [systematic name: 5-hydroxy-2-(4-hydroxy-3-methoxyphenyl)-3,8-dimethoxy-7-(3-methylbut-2-enyloxy)-4H-1-benzopyran-4-one], C(23)H(24)O(8). The two polymorphs, one monoclinic (polymorph A) and the other triclinic (polymorph B), show significant conformational differences, particularly in the enyloxy side chain, while only one (polymorph A) shows intermolecular hydrogen bonding.

摘要

对澳大利亚本土树木椭圆叶蜜茱萸果实的己烷提取物中两种结晶成分的晶体结构测定表明，它们是同一化合物的多晶型物，即类黄酮4',5-二羟基-3,3',8-三甲氧基-7-(3-甲基丁-2-烯氧基)黄酮[系统名称：5-羟基-2-(4-羟基-3-甲氧基苯基)-3,8-二甲氧基-7-(3-甲基丁-2-烯氧基)-4H-1-苯并吡喃-4-酮]，C(23)H(24)O(8)。这两种多晶型物，一种为单斜晶系（多晶型物A），另一种为三斜晶系（多晶型物B），显示出显著的构象差异，特别是在烯氧基侧链方面，而只有一种（多晶型物A）显示出分子间氢键。