发明授权
US4408044A Preparation of 3,6-disubstituted 4-amino-1,2,4-triazin-5-ones
失效
3,6-二取代的4-氨基-1,2,4-三嗪-5-酮的制备
- 专利标题: Preparation of 3,6-disubstituted 4-amino-1,2,4-triazin-5-ones
- 专利标题(中): 3,6-二取代的4-氨基-1,2,4-三嗪-5-酮的制备
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申请号: US338811申请日: 1982-01-11
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公开(公告)号: US4408044A公开(公告)日: 1983-10-04
- 发明人: Thomas Schmidt , Helmut Timmler , Gerhard Bonse , Heinz U. Blank , Gerhard Marzolph
- 申请人: Thomas Schmidt , Helmut Timmler , Gerhard Bonse , Heinz U. Blank , Gerhard Marzolph
- 申请人地址: DEX Leverkusen
- 专利权人: Bayer Aktiengesellschaft
- 当前专利权人: Bayer Aktiengesellschaft
- 当前专利权人地址: DEX Leverkusen
- 优先权: DEX3102318 19810124
- 主分类号: C07D253/06
- IPC分类号: C07D253/06 ; A01N43/707 ; C07D253/07 ; C07D405/04 ; C07D409/04
摘要:
The herbicidal 3,6-substituted 4-amino-1,2,4-triazin-5-one of the general formula ##STR1## wherein R.sup.1 and R.sup.2 have the meaning given in the description,is obtained in good yields by a new two-stage cyclization reaction if an .alpha.-ketocarboxylic acid amide of the general formulaR.sup.1 --CO--CO--NHR.sup.3 (II)is reacted with a hydrazidine of the general formula ##STR2## if appropriate in the presence of a diluent at temperatures between 0.degree. and 150.degree. C., whereby in the first process stage a condensation reaction takes place to give condensation products which still have open chains, and in the second process stage an elimination reaction with ring closure takes place to give the end product of formula (I).
公开/授权文献
- US4963373A R-T-E cereal composition and method of preparation 公开/授权日:1990-10-16
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