Patent ID: 7825241

Claim:
A process for producing a compound of formula comprising: a) reacting a reactive derivative of a compound of formula III with a compound of formula IV to obtain a compound of formula I b) adding an acid HX, in which X signifies Cl − , HSO 4 − , H 2 NSO 3 − , H 2 PO 4 − , ½(SO 4 ) 2− or R 1 YO 3 − , R1 signifies alkyl or aryl and Y is sulfur, to the compound of formula I in order to obtain a crystalline salt of the compound of formula I with the acid HX; c) isolating the crystalline salt from step b); d) converting the compound of formula I in crystalline salt form from step c) into cefdinir by cleaving the acetyl group on the oxygen of the oxime; and e) isolating cefdinir from the reaction mixture of step d).