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Natural product chemistry, 134. Syntheses of the natural coumarins gleinene and gleinadiene

✍ Scribed by Reisch, Johannes ;Wickramasinghe, Anura ;Wickremaratne, D. B. Mahinda

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
208 KB
Volume
1990
Category
Article
ISSN
0947-3440

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✦ Synopsis

Abstract

The 5,7‐dimethoxycoumarins, gleinene (3b) and gleinadiene (2), which naturally occur in Murraya gleinei root bark, have been synthesized in four steps from 7‐hydroxy‐5‐methoxycoumarin (1a) in overall yields of 45% and 19%, respectively.

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## Abstract The total synthesis of (__E__)‐Suberenol (1) was carried out under the conditions of palladium‐catalysed Heck condensation. Two other new coumarins, (__E__)‐7‐methoxy‐6‐(3‐methyl‐1,3‐butadienyl)coumarin [(__E__)‐suberodiene] (3) and (__E__)‐7‐methoxy‐6‐(3‐methyl‐1‐butenyl)coumarin [(__E