Process for the preparation of...

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C - Chemistry, Metallurgy

07

C

260/208.6

C07C 233/00 (2006.01)

Patent

CA 1118770

PROCESS FOR THE PREPARATION OF 6-DEMETHYL-6-DEOXY-6-METHYLENE-TEIRACYCLINES ABSTRACT OF THE DISCLOSURE The inveniion relates to the preparation of 6-demethyl-6- -deoxy-6-methylene-tetracycline by means of reductive dehalo- genation of the corresponding 11a-halo-6-demethyl-6-deoxy-6- -methylene-tetracycline, the reaction being carried out in presence of the stoichiometric quantity of a tertiary phos- phine, arsine or stibine and in a polar solvent. The time and temperature of the reaction are controlled within spe- cified limits to obtain a complete conversion.

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