Tandem enyne allene-radical cyclization via base-catalyzed isomerization of enediyne sulfones

Article abstract of DOI:10.1016/00404-0399(50)1366-P

Enediyne sulfones 12-16 undergo a base-catalyzed isomerization to the corresponding enyne allenes followed by a tandem enyne allene-radical cyclization at 37°C to provide 2,3-dihydrobenz[e]indenes 17-21 in good yields.