NOVEL 4-ETHOXYCARBONYL-1-METHYLPYRAZOL-5-SULPHON CARBARMATE DERIVATIVES AND PROCESS FOR PREPARING THEREOF

摘要

4-Ethoxycarbonyl-1-methyl pyrazole-5-sulfone carbamate derivatives of formula (I) are prepared by reacting sulfoneamide in the presence of a solvent and an alkali. In the formulas, R is C1-8 alkyl, alkylether, allyl or phenyl. The alkyl chloroformate is pref. ethyl chloroformate; and the alkali is selected from NaOH, NaHCO3, KOH, KHCO3, K2CO3, Ca(OH)2, triethylamine or pyrimidine. The cpds. of formula (I) are useful as an intermediate in the prodn. of sulfonyl urea herbicides.