| 摘要 |
An object of the invention is to provide an industrially advantageous process capable of remarkably suppressing the generation of an undesirable by-product cepham compound to thereby efficiently produce a desired 2±-methyl-2²-[(1,2,3-triazol-1-yl)methyl]penam-3a-carboxylic acid ester. In the present invention, a diphenylmethyl 2²-bromomethyl-2±-methylpenam-3±-carboxylate (BMPB) is reacted with 1,2,3-triazole in a halogenated hydrocarbon solvent at -5°C or lower. The reaction in a halogenated hydrocarbon solvent at -5°C or less can remarkably suppress the generation of an undesirable by-product cepham compound, so that the desired diphenylmethyl 2±-methyl-2²-[(2,2,3-triazol-1-yl)methyl]penam-3±-carboxylate (TMPB) can be efficiently produced.
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