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The reaction of 17,17-dichloro-androst-16(E)-chloromethylene with secondary amine base afforded substitution products of exocyclic D-ring ketones, in contrast to the reaction of alkaline base which cleaved steroidal D-ring to des-D formyl alkyne. The des-D formyl alkyne was employed to prepare D-ring annulated isoxazolo steroid via 1,3-dipolar nitrile oxide cycloaddition reaction.doi:10.6084/m9.figshare.15057977.v1 fatcat:b3mxrtfv45a6xjn7m2bytzwhb4