Rules for ring-fusion geometry and the preparation of trans- or cis-fused bicyclic compounds by radical closure
Abstract
Aldol condensation with (phenylseleno)acetaldehyde and radical cyclization leads to cis-fused bicyclic compounds when applied (Scheme 1) to esters of cycloalk-2-enylacetic acid; trans-isomers are formed when the reactions are used (Scheme 2) in conjunction with organocuprate-mediated addition to cycloalkenones.