[EN] SYNTHESIS METHODS OF FIROCOXIB AND INTERMEDIATE THEREOF<br/>[FR] PROCÉDÉS DE SYNTHÈSE DE FIROCOXIB ET INTERMÉDIAIRE DE CELUI-CI
申请人:SICHUAN QINGMU PHARMACEUTICAL CO LTD
公开号:WO2019062561A1
公开(公告)日:2019-04-04
Provided herein the synthesis methods of firocoxib and an intermediate thereof. The synthesis of the first intermediate is performed through methylation of p-bromopropiophenone or through Friedel-Crafts acylation of bromobenzene, avoiding the use of environmental unfriendly thioethers as starting materials. The second intermediate is directly obtained by sulfonation of the first intermediate, wherein the sulfidation reaction and the oxidization reaction are shortened to one-step reaction. The sulfonation step greatly simplifies the reaction steps, shortens the reaction time, and improves the reaction efficiency. Meanwhile, an N-bromosuccinimide(NBS) catalyst system is also adopted in the hydroxylation of the second intermediate to directly obtain the firocoxib intermediate. Such an environmental friendly method is suitable for large-scale production, and the reaction rate is increased. In addition, the firocoxib synthesis method comprises the synthesis method of the firocoxib intermediate and can prepare firocoxib in a milder and more environmentally friendly manner.