Some common heterocyclic compound, 345637-71-0, name is 2-(5-Methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)acetic acid, molecular formula is C7H7F3N2O2, 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. SDS of cas: 345637-71-0
To a solution of l-[4-(4,5-dihydro-5-phenyl-3-isoxazolyl)-2-thiazolyl]piperazine hydrochloride (i.e. the product of Example 7, Step E) (200 mg, 0.57 mmol) and 5-methyl-3- (trifluoromethyl)-l.H-pyrazole-l -acetic acid (0.120 g, 0.57 mmol) in dichloromethane (10 mL) at room temperature was added l-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (0.110 g, 0.57 mmol), triethylamine (0.086 g, 0.85 mmol) and 1-hydroxy- benzotriazole hydrate (0.020 g, 0.14 mmol). The reaction mixture was stirred at room temperature for 24 h. The reaction mixture was diluted with dichloromethane (30 mL), and washed with water (20 mL) and brine (20 mL). The organic layer was dried (Na2SO.;) and concentrated under reduced pressure. The crude residue was purified by column chromatography using 3 % methanol in chloroform as eluant to give 180 mg of the title product, a compound of the present invention as a white solid.1Eta NMR (CDCl3) delta 2.32 (s, 3Eta), 3.29 (m, IH), 3.52 (m, 2H), 3.61 (m, 2H), 3.79-3.72 (m,5H), 4.98 (m, 2H), 5.69 (m,lH), 6.33 (s, IH), 6.93 (s, IH), 7.38-7.28 (m, 5H). Mass spectrum at 505.5 (M+l).
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 345637-71-0, its application will become more common.
Reference:
Patent; E. I. DU PONT DE NEMOURS AND COMPANY; WO2008/13622; (2008); A2;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics