Synthesis of (Carboxymethylidene)cyclopentenedione Derivatives via the Oxidative Cleavage of the Allylic Double Bond in 2-Allyl-2,4-dichloro-5-(2,4,6-trimethoxyphenyl)cyclopent-4-ene-1,3-dione

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发表日期：

2024年11月1日

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V. A. Egorov,
L. S. Khasanova,
F. A. Gimalova,
M. S. Miftakhov

摘要

Abstract

The oxidative cleavage reactions of the allylic double bond in 2-allyl-2,4-dichloro-5-(2,4,6-trimethoxyphenyl)cyclopent-4-ene-1,3-dione in the OsO₄–NaIO₄ and KMnO₄–Et₃BnN⁺Cl^– systems were studied. The periodate cleavage of the starting 2-allylcyclopentene-1,3-dione gave an aldehyde, whose oxidation with the Jones reagent followed by HCl elimination resulted in the formation of the target 2-(carboxymethylidene)cyclopent-4-ene-1,3-dione. In the alternative approach, the permanganate oxidation of the starting 2-allylcyclopentene-1,3-dione led to the corresponding diol in a moderate yield.