Method for preparing 1-aryl-3-arylamino-2-pyrazolin-5- ones...

Details Method for preparing 1-aryl-3-arylamino-2-pyrazolin-5- ones... Method for preparing 1-aryl-3-arylamino-2-pyrazolin-5- ones...

C - Chemistry, Metallurgy

07

D

260/315.4

C07D 231/52 (2006.01)

Patent

CA 1178285

-ii- A METHOD FOR PREPARING 1-ARYL-3-ARYLAMINO-2-PYRAZOLIN-5-ONES FROM N-ARYL-3-ARYLAMINO-3-OXIMIMOPROPIONAMIDES Abstract of the Disclosure A method for preparing a l-aryl-3-arylamino 2-pyrazolin-5-one comprises reacting an N-aryl-3-arylamino-3-oximinopropionamide with an acylating agent in an inert solvent, then heating in contact with a strong acid catalyst and a dehydrating agent in an inert solvent, and then heating in contact with an acid in water and a lower alkanol. The l-aryl-3-arylamino-2-pyrazolin-5-ones produced by the method of the invention are represented by the structural formula: Image wherein each of R1 and R2 is phenyl or phenyl substituted with at least one halo, nitro, alkyl, alkoxy, or sulfamoyl group.

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