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Abstract
A convenient and efficient esterification method that used a modified Yamaguchi reagent (2,4,6-trichlorobenzoyl chloride–4-dimethylaminopyridine) and avoided use not only of intractable acid chloride but also of acid anhydrides was proposed. The reaction mechanism was described by Fourier transform infrared spectroscopy and supported by a density functional theory calculation.
GRAPHICAL ABSTRACT
ACKNOWLEDGMENTS
The authors thank Professor Y. Mazaki and Dr. M. Hasegawa of the School of Science, Kitasato University, and Dr. K. Nagai from the School of Pharmaceutical Sciences, Kitasato University.
Notes
a Assay yields calculated by HPLC using an internal standard method of coumarin.
b Isolated yield.
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