发明名称 Prodn. of N-sulphonyl 1,24-oxadiazole-3-carboxamide derivs. - from reaction of 1,2,4-oxadiazole-3-carboxylate salt and sulphonyl isocyanate, useful as herbicides
摘要 Prodn. of N-sulphonyl 1,2,4-oxadiazole-3-carboxamides of formula (I) or their salts comprises reacting a 1,2,4-oxadiazole-3-carboxylate salt of formula (II) with a sulphonyl isocyanate of formula R1SO2NCO (III) in a polar aprotic solvent at 0-100 deg. C. In formulae, R1 = opt. substd. aryl, aralkyl or heteroaryl; R2 = H or opt. substd. alkyl, alkoxy, alkylthio, alkylsulphinyl, alkylsulphonyl, alkylamino, dialkylamino or phenyl; and M = alkali(ne earth) metal. USE/ADVANTAGE - (I) are useful as herbicides. The process gives higher yields (e.g. 75%) than processes involving reaction of carboxamides with sulphonyl chlorides or of carboxylate esters with sulphonamides.
申请公布号 DE4233027(A1) 申请公布日期 1994.04.07
申请号 DE19924233027 申请日期 1992.10.01
申请人 BAYER AG, 51373 LEVERKUSEN, DE 发明人 MUELLER, KLAUS-HELMUTH, DR., 4000 DUESSELDORF, DE;KISTEN, ROLF, DR., 4019 MONHEIM, DE
分类号 A01N43/824;C07D271/06;(IPC1-7):C07D271/07;C07D413/12;C07D407/12;C07D409/12;C07D417/12;C07D403/12;C07D401/12;A01N43/82 主分类号 A01N43/824
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