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.
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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 |
代理机构 |
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