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.