Stereoselective synthesis of (cis-hydrindane) models for C-18 radical reactivity in steroid C/D rings
Abstract
The keto-acid 5 undergoes stereospecific Peterson reaction to afford the (Z)-α-unsaturated ester-acid 6, and the derived phenyl selenoester cyclises also stereospecifically to the cis-hydrindanone 8via a 5-exo acyl radical process: the ketone 8 is transformed through enone 11 into the diene-acids 2 and 3, models for study of C-18 radical reactions in steroid C/D systems.