| abstract |
The present invention reacts a compound of formula III with oxalyl chloride and the resulting product is treated with hydrazine and alkali metal hydroxides in an aqueous phase at elevated temperature, ether is added to form a three-phase system after the treatment is completed, and the intermediate phase is acidified The present invention relates to a process for preparing the compound of formula (I).n n n <Formula I>n n n n n n n n <Formula III>n n n n n n n n The present invention further relates to polymorphs of compounds of formula (I).n n n Disorders of 6- (4-chlorophenyl) -2,2-dimethyl-7-phenyl-2,3-dihydro-1H-pyrrolidin-5-ylacetic acid, polymorph, rheumatoid type |