The fmt tandem radical cyclization of linear homdylic xanthates was explored. Homoallylic xanthates prepared from cr, o-unsaturated esters were easily cyclized by tin hydride with an radical initiator to give the corresponding thionolactone annulated cyclopentane skeleton in a high yield. The stereochemistry of cyclized products was also discussed. Thionolactones obtained were oxidized chemoselectivity with m-CPBA under neutral condition to afford y- ...
