DIELS–ALDER REACTIONS OF 1,2,3,6-TETRAHYDROBENZOCYCLOBUTENE-3,6-DIONES. A NEW SYNTHESIS OF [4.4.2]PROPELLANES AND A DIVERGENCE OF SITESELECTIVITY CONTROLLED BY STERIC HINDRANCE
作者:Masaji Oda、Yoshinori Kanao
DOI:10.1246/cl.1981.1547
日期:1981.11.5
1,2,3,6-Tetrahydrobenzocyclobutene-3,6-diones underwent Diels–Alderreactions most preferably at the internaldoublebond giving [4.4.2]propellanes unless steric hindrance is not significant. The adducts with cyclic 1,3-dienes were transformed photochemically to novel strained cage molecules.
Enantioselective Total Synthesis of [3]‐Ladderanol through Late‐Stage Organocatalytic Desymmetrization**
作者:Sayan Ray、Subhajit Mondal、Santanu Mukherjee
DOI:10.1002/anie.202201584
日期:2022.6.13
An enantioselective desymmetrization route to [3]-ladderanol has been devised that is centered around an organocatalytic enantioselective formal C(sp2)−H alkylation of tetracyclic meso-cyclohexenedione. This strategy involving the late-stage introduction of chirality offers flexibility and enabled the facile synthesis of bothenantiomers of [3]-ladderanol as well as an analogue.