| 摘要 |
PCT No. PCT/EP93/03119 Sec. 371 Date May 11, 1995 Sec. 102(e) Date May 11, 1995 PCT Filed Nov. 6, 1993 PCT Pub. No. WO94/11357 PCT Pub. Date May 26, 1994Preparation of a 1,2,4-triazol-3-one compound substituted in positions 4 and 5 by an alkyl or aryl group and, optionally, in position 2 by an alkyl group, by reacting an ester a of carbamic acid N-substituted by an alkyl or aryl group with a hydrazide of an aliphatic or aromatic carboxylic acid, optionally N-substituted by an alkyl group, in the presence of a strong base. |
