5-Cyclopropylethynyl-3-nitrothiophene-2-carboxylic acid methyl ester → 3-Amino-5-(2-cyclopropylethyl)thiophene-2-carboxylic acid methyl ester

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Reaction Steps

A suspension of 5-cyclopropylethynyl-3-nitrothiophene-2-carboxylic acid methyl ester (1.0 g) and palladium (5% on carbon) (170 mg) in methanol (50 mL) was vigorously stirred under an atmosphere of hydrogen at atmospheric pressure for 5 h. The catalyst was then filtered off through kieselguhr, and the solvent was removed in vacuo. The product with the molecular weight of 225.31 (C11H15NO2S) was obtained in this way; MS (ESI): 226 (M+H+).

Provenance & Evidence