公开(公告)号：CA2053236A1

公开(公告)日：1991-03-07

申请号：CA2053236

申请日：1990-09-04

Applicant: BASF AG

Inventor： BUGGLIN MARIUS ,  GROPP HERBERT ,  JANITSCHKE LOTHAR ,  KARL ULRICH ,  LENZ HANS H

IPC: C07D233/90 ,  C07D473/06 ,  C07D473/10

Abstract: BASF Aktiengesellschaft 6 O.Z. 0050/41083 Process for the preparation of 3,7-dialkylxanthines Summary: The preparation of 3,7-dialkylxanthines I (I) (R1 and R2 denote C1-C4-alkyl) by the reaction of 4-amino-imidazole-carboxamide-(5) II (II), with an alkali metal 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.