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INDUSTRIAL SYNTHESIS PROCESS OF 5-AMINO-3-CARBOXYMETHYL-4-CYANO-2-THIOPHENOCARBOXYLIC ACID METHYL DIESTER ACID
INDUSTRIAL SYNTHESIS PROCESS OF 5-AMINO-3-CARBOXYMETHYL-4-CYANO-2-THIOPHENOCARBOXYLIC ACID METHYL DIESTER ACID
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机译:5-氨基-3-羧甲基-4-氰基-2-硫代苯甲酸甲酯的工业合成过程
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摘要
Methyl 5-amino-4-cyano-3-(2-methoxy-2-oxoethyl)-2-thiophene-carboxylate (I) is new. Independent claims are included for the following: (1) preparation of (I); (2) synthesis of ranelic acid, its strontium, calcium or magnesium salts involving reaction of 5-amino-4-cyano-3-(2-methoxy-2-oxoethyl)-2-thiophene-carboxylate (I) with an ester of bromoacetic acid to yield the corresponding tetra ester followed by its conversion into ranelic acid, its strontium, calcium or magnesium salts; and (3) new 4,4-dicyano-1-methoxy-3-methoxycarbonylmethyl-but-3-en-1-olatemorpholin-4-ium (II).
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