Protobruceols: New 6-C-Monoterpenyl-5,7-Oxygenated Coumarins From Eriostemon Brucei
作者:
MohammadA. Rashid,
JamesA. Armstrong,
AlexanderI. Gray,
PeterG. Waterman,
期刊:
Natural Product Letters
(Taylor Available online 1992)
卷期:
Volume 1,
issue 2
页码: 79-84
ISSN:1057-5634
年代: 1992
DOI:10.1080/10575639208048892
出版商: Taylor & Francis Group
关键词: Eriostemon brucei;Rutaceae;tricyclic 6-C-monoterpenyl-5,7-oxygenated coumarins;protobruceols
数据来源: Taylor
摘要:
Six novel coumarins have been isolated from the aerial parts ofEriostemon bruceivar.cinereus.Five had the same tricyclic nucleus [(+)-2-methyl-5-hydroxy-2H-benzo-[1,2b:3,4b′]-dipyran-8-one] and varied only in the C-2 substituent,viz.4-methylpent-3-enyl (protobruceol-1), 4-hydroxy-4-methylpent-2(E)-enyl (protobruceol-II), 4-hydroperoxy-4-methylpent-2(E)-enyl (protobruceol-II hydroperoxide), 3-hydroxy-4-methylpent-4-enyl (protobruceol-III), 3-hydroperoxy-4-methylpent-4-enyl (protobruceol-III hydroperoxide). A sixth coumarin was characterised as the linear annellated isomer of protobruceol-II, (+)-2-methyl-2-(4-hydroxy-4-methylpent-2(E)-enyl)-5-hydroxy-2H-benzo-[1,2b:5,4b′]-dipyran-8-one (protobruceol-IV)
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