Electric Literature of 52222-73-8, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 52222-73-8 name is 4-(Trifluoromethyl)-1H-pyrazole, This compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.
(5)-N-(4-Cyano-3-(trifluoromethyl)phenyl)-2-hydroxy-2-methyl-3-(4-(trifluoromethyl)- lH-pyrazol- l-vDpropanamide C16H12F6N (0773) (0774) [00351] To a solution of 4-trifluoromethyl-pyrazole (0.20 g, 0.00147 mol) in anhydrous THF (10 mL), which was cooled in an ice water bath under an argon atmosphere, was added sodium hydride (60% dispersion in oil, 0.18 g, 0.004409 mol). After addition, the resulting mixture was stirred for 3 h. (7?)- 3-Bromo-N-(4-cyano-3-(trifluoromethyl)phenyl)-2-hydroxy-2-methylpropanamide (8) (0.516 g, 0.00147 mol) was added to above solution, and the resulting reaction mixture was allowed to stir overnight at RT under argon. The reaction was quenched by water, and extracted with ethyl acetate. The organic layer was washed with brine, dried with MgS04, filtered, and concentrated under vacuum. The product was purified by a silica gel column using DCM and ethyl acetate (19: 1) as eluent to afford 0.30 g (50%) of the titled compound as white foam. (0775) [00352] Compound 1017 was characterized as follows: NMR (400 MHz, DMSO-i delta 10.38 (s, 1H, NH), 8.45 (d, = 2.0 Hz, 1H, ArH), 8.25-8.22 (m, 2H, ArH & Pyrazole-H), 8.11 (d, = 8.2 Hz, 1H, ArH), 7.82 (s, 1H, Pyrazole-H), 6.39 (s, 1H, OH), 4.55 (d, = 14.0 Hz, 1H, CH), 4.37 (d, = 14.0 Hz, 1H, CH), 1.40 (s, 3H, CH3); Mass (ESI, Positive): 407.0945 [M+H]+.
At the same time, in my other blogs, there are other synthetic methods of this type of compound, 4-(Trifluoromethyl)-1H-pyrazole, and friends who are interested can also refer to it.
Reference:
Patent; UNIVERSITY OF TENNESSEE RESEARCH FOUNDATION; NARAYANAN, Ramesh; MILLER, Duane; PONNUSAMY, Thamarai; HWANG, Dong-Jin; HE, Yali; (234 pag.)WO2017/214634; (2017); A1;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics