Synthetic Route of 131797-35-8, A common heterocyclic compound, 131797-35-8, name is 5-Chloro-3-(trifluoromethyl)-1H-pyrazole, molecular formula is C4H2ClF3N2, its traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
To a solution of ethyl 2-[7-(chloromethyl)-2-methyl-5-oxo-5H-[l,3]thiazolo[3,2-a]pyrimidin- 3-yl]propanoate (2 g, 6.35 mmol) in acetonitrile (30 mL) was added 5-chloro-3-(trifluoromethyl)-lH- pyrazole (1.1 g, 6.45 mmol), potassium iodide (1.06 g, 6.39 mmol), and potassium carbonate (2.2 g, 15.9 mmol). The resulting mixture was stirred for 2 h at 90 C, cooled to room temperature and concentrated in vacuo. The residue was purified by flash chromatography on silica gel eluting with ethyl acetate/petroleum ether (1/4) to afford ethyl 2-(7-[[5-chloro-3-(trifluoromethyl)-lH-pyrazol-l-yl]methyl]- 2-methyl-5-oxo-5H-[l,3]thiazolo[3,2-a]pyrimidin-3-yl)propanoate (2.9 g, crude) as a brown solid. LCMS (ESI): M+H+ = 449.0.
The basis of chemical reaction formula synthesis, the synthesis route is composed of some specific reactions and combined according to certain logical thinking. We look forward to the emergence of more reaction modes in the future.
Reference:
Patent; F. HOFFMANN-LA ROCHE AG; GENENTECH, INC.; YU, Jiang; WU, Guosheng; YUEN, Po-Wai; VILLEMURE, Elisia; SCHWARZ, Jacob; LY, Cuong; SELLERS, Benjamin; VOLGRAF, Matthew; WO2015/52226; (2015); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics