Process for the preparation of 20-keto-21-alpha-hydroxy...

Details Process for the preparation of 20-keto-21-alpha-hydroxy... Process for the preparation of 20-keto-21-alpha-hydroxy...

C - Chemistry, Metallurgy

12

P

C12P 33/02 (2006.01) C07J 9/00 (2006.01) C07J 21/00 (2006.01) C07J 33/00 (2006.01) C07J 41/00 (2006.01)

Patent

CA 2098146

L'invention concerne un nouveau procédé de préparation des composés (I): (voir formule I) où R1 est alkyle (1-3c), R2 est alkyle (1-12c) et R3 est alkyle (1-4c), au dépàrt du dérivé 17.beta.-CN 17.alpha.-OR4 correspondant, où R4 est un reste d'éther facilement clivable, ainsi que des intermédiaires. Les composés (I) sont connus.

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