Process for the preparation of 20-oxo...

C - Chemistry – Metallurgy – 07 – J

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C07J 5/00 (2006.01) C07J 41/00 (2006.01)

Patent

CA 2082284

L'invention concerne un procédé de préparation des composés (I): Image où R1 est notamment hydrogène ou alkyle, R2 est alkyle et les noyaux A, B, C et D portent éventuellement une ou plusieurs double liaisons, une ou plusieurs fonctions hydroxy ou cétone éventuellement protégées, un ou plusieurs atomes d'halogène ou un ou plusieurs radicaux alkyle, alkyloxy, alkényle ou alkynyle, procédé consistant à oxyder un composé 20-formamido 21-hydroxy 17(20)-ène correspondant, en présence d'eau puis à hydrolyser le 21-formiate obtenu. L'invention concerne encore des intermédiaires nouveaux ainsi obtenus.

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