Invention Grant
- Patent Title: Process for the preparation of 3,7-dialkylxanthines
- Patent Title (中): 制备3,7-二甲基吗啉的方法
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Application No.: US835455Application Date: 1992-03-02
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Publication No.: US5210192APublication Date: 1993-05-11
- Inventor: Marius Bugglin , Herbert Gropp , Lothar Janitschke , Ulrich Karl , Hans-Heinrich Lenz
- Applicant: Marius Bugglin , Herbert Gropp , Lothar Janitschke , Ulrich Karl , Hans-Heinrich Lenz
- Applicant Address: DEX Ludwigshafen
- Assignee: BASF Aktiengesellschaft
- Current Assignee: BASF Aktiengesellschaft
- Current Assignee Address: DEX Ludwigshafen
- Priority: DEX3929589 19890906
- Main IPC: C07D233/90
- IPC: C07D233/90 ; C07D473/06 ; C07D473/10
Abstract:
The invention is directed to a process for preparing 3,7-dialkylxanthines of the formula I ##STR1## (R.sup.1 and R.sup.2 denote C.sub.1 -C.sub.4 -alkyl) by the reaction of 4-amino-imidazolecarboxamide-(5) of the formula II ##STR2## with an alkali cyanate in aqueous solution at a pH of from 3 to 5 followed by cyclization of the resulting urea derivative at a pH of from 8 to 14.
Public/Granted literature
- US5857704A Adjusting device for a deflection fitting Public/Granted day:1999-01-12
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