Process for the preparation of 20-keto-delta _-steroids and...

Details Process for the preparation of 20-keto-delta _-steroids and... Process for the preparation of 20-keto-delta _-steroids and...

C - Chemistry, Metallurgy

07

J

260/56, 260/9

C07J 7/00 (2006.01) C07J 13/00 (2006.01) C07J 21/00 (2006.01) C07J 41/00 (2006.01)

Patent

CA 1291747

ABSTRACT The invention relates to a new process for the preparation of 20-keto-.DELTA.16 steroids wherein a 17-isocyanosulfonylmethylene steroid is converted in one step into the new 20-isocyano-20- sulfonyl-.DELTA.16 steroid using an alkylating agent such as methylio- dide. The resulting steroid is hydrolyzed in a subsequent step to the corresponding 20-keto-.DELTA.16 steroid. The final products are suitable starting compounds for the preparation of therapeuti- cally useful steroids, comprising pregnanes and, particularly, progesterone derivatives.

453028

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