A process for the preparation of 1-phenyl-3-(4-chlorophenyl)-pyrazol-4-ylacetic acid and its calcium salt
申请人:SPOFA
Spojené Podniky Pro Zdravotnickou Vyrobu
公开号:EP0299504A1
公开(公告)日:1989-01-18
The invention relates to a process for preparing 1-phenyl-3-(4-chlorophenyl)-pyrazol-4-ylacetic acid, known under the generic name Lonazolac, and its calcium salt (Ca-Lonazolac). The process comprises the reductive hydrolysis of 1-phenyl-3-(4-chlorophenyl)-4-pyrazolecarboxaldehyde cyanohydrine using stannous chloride in a mixture of acetic acid, hydrochloric acid and preferably a catalytic amount of hydroiodic acid at elevated temperatures, and, if required, subsequent conversion of the acid into the calcium salt. The products are potent anti-inflammatory agents.
该发明涉及一种制备1-苯基-3-(4-氯苯基)-吡唑-4-基乙酸(通用名称为洛那唑)及其钙盐(Ca-洛那唑)的过程。该过程包括在乙酸、盐酸混合物中,使用氯化亚锡在较高温度下对1-苯基-3-(4-氯苯基)-4-吡唑甲醛氰水合物进行还原水解,且最好使用少量碘化氢作为催化剂,如有必要,随后将酸转化为钙盐。所得产品是有效的抗炎药物。