Method for producing chemical compounds

Details Method for producing chemical compounds Method for producing chemical compounds

C - Chemistry, Metallurgy

07

D

260/118.5

C07D 499/00 (2006.01)

Patent

CA 1277313

ABSTRACT OF THE DISCLOSURE Process are provided herein for the preparation of a compound of the Formula I Image (I) in which R stands for halogen, e.g. chlorine, bromine or iodine, giving rise to high yields of substantially pure 6.beta.-halopenicil- lanic acids, which is obtained in one step. The process com- prises epimerizing a dicyclohexylammonium salt of a 6.alpha.-halopeni- cillanic acid suspended in a mixture of water and an aprotic organic solvent and in the presence of a base which catalyzes the epimerization to precipitate the less soluble dicyclohexyl- ammonium salt of the corresponding 6.beta.-halopenicillanic acid thus formed. The salt may be either recovered as such, or the salt may be directly converted either to the corresponding acid, or may be directly convert to another suitable salt.

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