T. Peglow et al., Radical cation Diels-Alder reaction between indoles and exocyclic 1,3-dienes with incorporated intentional cleaving points, CHEM COMMUN, (5), 1999, pp. 433-434
A photoinduced electron transfer catalyzed radical cation Diels-Alder react
ion between exocyclic dienes, containing an N-O or N-N bond as an intention
al cleaving point in the ring moiety, and indoles yields, after cleavage of
the N-O or N-N bond, highly functionalized tetrahydrocarbazole derivatives
, products of a formal Diels-Alder reaction between indole and open chain 1
,3-dienes.