Adding a certain compound to certain chemical reactions, such as: 345637-71-0, name is 2-(5-Methyl-3-(trifluoromethyl)-1H-pyrazol-1-yl)acetic acid, belongs to pyrazoles-derivatives compound, can increase the reaction rate and produce products with better performance than those obtained under traditional synthetic methods. Here is a downstream synthesis route of the compound 345637-71-0, Recommanded Product: 345637-71-0
A solution of 400 mg (0.77 mmol) of 1,1-dimethylethyl 4-[4-[[methyl[(l/?)-l- phenylethyl]amino]carbonyl]-2-thiazolyl]-l-piperidinecarboxylate (i.e. the product of Example 5, Step A) in 10 mL of a 1:1 mixture of methanol and dichloromethane was treated with 10 mL of 2 N hydrochloric acid in ether and stirred at room temperature for 4 h. The reaction mixture was concentrated on rotary evaporator, and the residue was three times treated with 10 mL of methanol followed by concentration to leave the crude piperidine hydrochloride. The reaction mixture was then dissolved in 10 mL of acetonitrile, and 1.O mL of triethylamine was added. Meanwhile, a solution of 310 mg (1.49 mmol) of 5-methyl-3-(trifluoromethyl)-lH-pyrazole-l -acetic acid in 10 mL of acetonitrile was treated with 1.0 mL of a solution of 1-propanephosphonic acid cyclic anhydride (50 % in ethyl acetate), stirred at room temperature for 15 minutes, then combined with the above amine solution. The reaction mixture was stirred at room temperature overnight, diluted with 50 mL of ethyl acetate, washed with 1 N aqueous hydrochloric acid, 1 N aqueous sodium hydroxide and brine, dried with MgSC^, filtered and concentrated under reduced pressure. Purification by Medium Pressure Liquid Chromatography (MPLC) on silica gel using ethyl acetate/methanol as eluant provided 330 mg of the title product, a compound of the present invention, as a white solid.
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Reference:
Patent; E. I. DU PONT DE NEMOURS AND COMPANY; WO2008/91594; (2008); A2;,
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics