Highly stereoselective 6-exo ring-closure of 5-substituted hept-6-enyl radicals
摘要:
5-Substituted 7-melhylthio-7-(p-tolylsulfonyl)-6-heptenyl radicals (1) and their 4-oxa derivatives cyclized in 6-exo manner with extremely high 1,2-asymmetric induction leading to trans ring-closure. Transition states for the ring closure are discussed by the experimental results and MO calculations.
Highly stereoselective 6-exo ring-closure of 5-substituted hept-6-enyl radicals
摘要:
5-Substituted 7-melhylthio-7-(p-tolylsulfonyl)-6-heptenyl radicals (1) and their 4-oxa derivatives cyclized in 6-exo manner with extremely high 1,2-asymmetric induction leading to trans ring-closure. Transition states for the ring closure are discussed by the experimental results and MO calculations.