METHOD FOR PRODUCING HETEROARYLCARBOXYLIC ACID ESTER DERIVATIVE, AND PRODUCTION INTERMEDIATE OF SAME
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United States of America Patent
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Sep 9, 2016
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Mar 11, 2014
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Abstract
Compounds of formula (9), which are useful as therapeutic drugs for diabetes, may be produced by the following reaction sequence: (a) diester (3) is synthesized by the reaction of compound (1) and compound (2); (b) ester (4) is synthesized by deprotection of diester (3) (or ester (4) is synthesized by the reaction of compound (5) and compound (2)); (c) ester (4) is converted to acid halide; (d) the acid halide is reacted with an amidinophenol derivative; and (e) the obtained diester derivative is deprotected under acidic conditions, and converted to compound (9):
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