Introduction of a new synthetic route about C4H2BrF3N2

According to the analysis of related databases, 19968-17-3, the application of this compound in the production field has become more and more popular.

Electric Literature of 19968-17-3, In the chemical reaction process, reaction time, type of solvent, can easily affect the result of the reaction, thereby determining the yield and properties of the reaction product. An updated downstream synthesis route of 19968-17-3 as follows.

To a solution of 4-bromo-3-trifluoromethyl-lH-pyrazole 33 (0.645 g, 3 mmol) in dimethylformamide (DMF) (50 niL) was added NaH (0.2 g, 9 mmol). The mixture was stirred for 0.5 h at room temperature and the 2-bromo-l ,3-thiazole (0.76 g, 4.5 mmol) was added. The reaction mixture was stirred for 1 h at room temperature. The reaction temperature was raised to 90C and stirred for overnight. The reaction was quenched with MeOH and solvent was removed in vacuo. The residue was treated with water and EtOAc. The organic layer was separated and aqueous was extracted with EtOAc. The combined organic phase was dried over Na2S04, filtered, and concentrated to give crude product. The crude product was purified on ISCO columns. Fractions containing pure product were combined and evaporated to give 34 as a brown oil (0.45 g, 50%).

According to the analysis of related databases, 19968-17-3, the application of this compound in the production field has become more and more popular.

Reference:
Patent; CALCIMEDICA, INC.; WHITTEN, Jeffrey, P.; CAO, Jianguo; WANG, Zhijun; GREY, Jonathan; ROGERS, Evan; WO2015/54283; (2015); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics