Process for the preparation of 3 iodo - and 3- bromorifamycin s

Details Process for the preparation of 3 iodo - and 3- bromorifamycin s Process for the preparation of 3 iodo - and 3- bromorifamycin s

C - Chemistry, Metallurgy

07

D

260/235.82

C07D 498/08 (2006.01)

Patent

CA 1099265

ABSTRACT OF THE DISCLOSURE A process is disclosed for the preparation of 3 iodo- or 3-bromorifamycin S which comprises reacting refamycin S with at least 2 equivalents of the corresponding halogen in the presence of at least one mole of pyridine for each equivalent of halogen. The reaction is carried out in inert, polar, hydro- phyllic solvents at a temperature not above the room temperature. The yields are very high and the products obtained have a high degree of purity.

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