"tert-Amino Effect" in Heterocyclic Synthesis. The Effect of a p-Quinone Moiety on the H-Transfer and 1,5-Electrocyclization Reactions

Article abstract of DOI:10.1021/jo00245a028

(Dialkylamino)benzoquinone 15 and (dialkylamino)naphthoquinones 32 and 34-37 undergo a thermal cyclization to the corresponding pyrrolo<1,2-a>indoles 41, 43, and 45-47 and to the pyrido<1,2-a>indole 44, respectively.A corresponding hydroquinone, viz. (E/Z