申请人:Linhai Huanan Chemical Co., Ltd.
公开号:US20220089526A1
公开(公告)日:2022-03-24
A synthesis method for a candesartan cilexetil intermediate represented by formula (II) is provided. The method includes (1) dissolving a compound represented by formula (IV) to an aprotic solvent to obtain a first mixed solution, and dissolving a phase transfer catalyst and an azidation reagent to water to obtain a second mixed solution; (2) dropping the first mixed solution to the second mixed solution for azidation reaction, and after the reaction is ended, standing and layering same to obtain an organic phase containing a compound represented by formula (V); (3) dropping the obtained organic phase containing the compound represented by formula (V) to tertiary butyl alcohol for rearrangement reaction, and after the reaction is ended, concentrating same to obtain a solid or oily material, then adding a crystallizing solvent to the obtained solid or oily material for recrystallization, and separating same to obtain a crystal.
提供一种用于合成化合物(II)的缬沙坦西乐沙丁中间体的方法。该方法包括:(1)将化合物(IV)溶解于无质子溶剂中以获得第一混合溶液,并将相转移催化剂和叠氮化试剂溶解于水中以获得第二混合溶液;(2)将第一混合溶液滴入第二混合溶液中进行叠氮化反应,反应结束后静置并分层,从而获得含有化合物(V)的有机相;(3)将获得的含有化合物(V)的有机相滴入叔丁醇中进行重排反应,反应结束后浓缩,获得固体或油状物质,然后向获得的固体或油状物质中加入结晶溶剂进行重结晶,并分离,从而获得晶体。