83-10-3, 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. 83-10-3 name is 1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxylic acid, 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.
Step 2) N-(2-fluoro-4-hvdroxyphenyl)-L5-dimethyl-3-oxo-2-phenyl-2,3-dihvdro-lH- pyrazole-4-carboxamide [0205] To a suspension of 4-amino-3-fluorophenol (1.0 g, 7.87 mmol) and 1,5- dimethyl-3-oxo-2-phenyl-2,3-dihydro-lH-pyrazole-4-carboxylic acid (2.19 g, 9.44 mmol) in CH2C12 (20 mL) were added EDCI (3.02 g, 15.7 mmol) and HOAT (0.21 g, 1.57 mmol). The reaction mixture was refluxed for 20 hours, and then cooled to rt. Water (10 mL) was added and the mixture stirred at rt overnight, then filtered and the filter cake was washed with water (5 mL), followed by purifying by a silica gel column chromatography (CH2Cl2/MeOH (v/v) = 70/1) to give the title compound as a beige white solid (1.25 g, 46.6%). MS (ESI, pos, ion) m/z: 342.1 [M+H]+, Rt = 2.712 min.
At the same time, in my other blogs, there are other synthetic methods of this type of compound, 1,5-Dimethyl-3-oxo-2-phenyl-2,3-dihydro-1H-pyrazole-4-carboxylic acid, and friends who are interested can also refer to it.