发明授权
US4656275A Preparation of riboflavin, and
4,5-dimethyl-N-(D)-ribityl-2-(O-alkoxyphenylazo)-aniline intermediates
失效
制备核黄素和4,5-二甲基-N-(D) - 二丙基-2-(O-烷氧基苯偶氮) - 苯胺中间体
- 专利标题: Preparation of riboflavin, and 4,5-dimethyl-N-(D)-ribityl-2-(O-alkoxyphenylazo)-aniline intermediates
- 专利标题(中): 制备核黄素和4,5-二甲基-N-(D) - 二丙基-2-(O-烷氧基苯偶氮) - 苯胺中间体
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申请号: US730056申请日: 1985-05-03
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公开(公告)号: US4656275A公开(公告)日: 1987-04-07
- 发明人: Hansgeorg Ernst , Heinz Eckhardt , Joachim Paust
- 申请人: Hansgeorg Ernst , Heinz Eckhardt , Joachim Paust
- 申请人地址: DEX Ludwigshafen
- 专利权人: BASF Aktiengesellschaft
- 当前专利权人: BASF Aktiengesellschaft
- 当前专利权人地址: DEX Ludwigshafen
- 优先权: DEX3417944 19840515
- 主分类号: C07C67/00
- IPC分类号: C07C67/00 ; C07C241/00 ; C07C245/08 ; C07D475/14 ; C07C107/06
摘要:
An improved process for the preparation of riboflavin by condensation of a 4,5-dimethyl-N-(D)-ribityl-2-phenylazoaniline derivative with barbituric acid in the presence of an acidic condensing agent in an organic solvent, wherein a 4,5-dimethyl-N-(D)-ribityl-2-(o-alkoxyphenylazo)-aniline of the formula IIa ##STR1## where R is alkyl of 1 to 4 carbon atoms, in particular methyl, is reacted with barbituric acid, as well as the novel intermediates of the formula IIa.
公开/授权文献
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