.delta. sun15 xx-steroid

Details .delta. sun15 xx-steroid .delta. sun15 xx-steroid

C - Chemistry, Metallurgy

07

J

260/40

C07J 1/00 (2006.01) C07J 33/00 (2006.01)

Patent

CA 1122591

ABSTRACT OF THE DISCLOSURE The present invention provides in a process for the production of a .DELTA.15-steroid having the general formula I Image (I), wherein R1 represents a hydrogen atom, a trialkyl silyl group or an acyl group and R2 represents an ethynyl group, a chloro- ethynyl group or a propynyl group, which comprises introducing the R2 group into the 17.alpha.position of a 17- oxo steroid having the general formula II Image (II), wherein Y represents a ketalised keto group and one of the ---- bonds in the 4, 5-, 5, 6- or 7, 10- position is a carbon-carbon double bond and the others represent carbon-carbon single bonds and A-B represents a carbon-carbon double bond or the grouping Image wherein R' represents a hydrogen atom, a silyl, acyl, sulphonyl or nitro group, the improvement in which Y in formula II represents a keto group protected with ethane dithiol - (1,2) and the carbon-carbon double bond is in the 4,5-position.

314900

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