carried out in the presence of bicarbonate in an aprotic solvent. Dehydration of this intermediate to a 2-substituted-4-chloromethylthiazole is accomplished by reaction with thionylchloride, sulfurylchloride, phosphorylchloride, phosphorus trichloride or phosphorus pentachloride. Substituents on the thioamide, such as amino, alkyl, or aryl, are shown not to affect the success of the reaction. As a
Certain 4-halomethylthiazoles having a 2-substituted-aminomethyl group are prepared by reacting an aminothioamide with a dihalopropanone in the presence of a haloalkane and a bicarbonate, and dehydrating the resulting intermediate.
[EN] AN IMPROVED PROCESS FOR PREPARING NIZATIDINE INTERMEDIATE<br/>[FR] PROCEDE AMELIORE DESTINE A LA PREPARATION D'UN PRODUIT INTERMEDIAIRE DE LA NIZATIDINE
申请人:KUMAR DINESH R
公开号:WO2004069817A1
公开(公告)日:2004-08-19
The present invention comprises: preparation of dimethylaminothioacetamide by a novel process and its conversion to pure 4-chloromethyl-4-hydroxy-2-dimethylaminomethyl-2-thiazoline by an improved process. The 4-chloromethyl-4-hydroxy-2-dimethylaminomethyl-2-thiazoline obtained by the present invention is substantially of good purity, capable of being used to product commercial quantities of Nizatidine pharmaceutical grade. Dimethylaminothioacetamide is prepared by reacting dimethylaminoacetonitrile with phosphorus pentasulfide, which is then reacted with 1,3-dichloroacetone in dialkylethers, to get substantially pure 4-chloromethyl-4-hydroxy-2-dimethylaminomethyl-2-thiazoline.
Process for preparing intermediates to nizatidine and related compounds
申请人:Eli Lilly and Company
公开号:US05457206A1
公开(公告)日:1995-10-10
The present invention provides a process for preparing a 2-(aminomethyl)-4-thiazolemethanol. The compounds produced by the process of the present invention are useful for synthesizing anti-ulcer compounds such as Nizatidine.