The present invention relates to an improved process for the preparation of 2-methyl-3-(o-tolyl)-7-chloro-1,2,3,4-tetrahydro-4-oxo-6-quinazolinesulfonamide by reacting the corresponding benzamide precursor with acetaldehyde or an acetal at an elevated temperature in the presence of ethanol or isopropanol and an acid having a negative pKa.
本发明涉及一种制备 2-甲基-3-(邻
甲苯基)-7-
氯-1,2,3,4-四氢-4-氧代-6-
喹唑啉磺酰胺的改进工艺,其方法是在
乙醇或
异丙醇和具有负 pKa 的酸存在下,在高温下使相应的苯甲酰胺前体与
乙醛或
缩醛反应。