A Protection-Deprotection Method for the Synthesis of Substituted Benzoyloxybenzoates
作者:
E. Chin,
J.W. Goodby,
期刊:
Molecular Crystals and Liquid Crystals
(Taylor Available online 1986)
卷期:
Volume 141,
issue 3-4
页码: 311-320
ISSN:0026-8941
年代: 1986
DOI:10.1080/00268948608079617
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
Common syntheses of phenyl benzoyloxybenzoates generally produce products in low yields. A variety of synthetic pathways were employed in an attempt to increase the overall yield of the final product. It was found that catalytic agents such as boron trifluoride-etherate (BF3Et2O), 1,3-dicyclohexylcarbodiimide (DCC), and 4-N, N-di-methylaminopyridine (DMAP) were relatively ineffective in these processes. However. protection of the hydroxy moiety of an appropriately substituted benzoic acid with methyl chloroformate, followed by esterification under normal conditions, and deprotection with ammonia in ethanol produces the hydroxy-benzoyloxybenzoate intermediate. This material can be used in further esterifications to produce phenyl benzoyloxybenzoate compounds in good yield. Materials such as the triply reentrant compound 4-n-nonyloxyphenyl 4-nitrobenzoyloxybenzoate (DB9ONO2) can be prepared by this method.
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