Photoinduced, Electron-Transfer-Catalyzed Diels-Alder Reaction Between Indole and 1,3-Cyclohexadienes1

Abstract
Triarylpyrylium tetrafluoroborates are very effective sensitizers for the photoinduced (450 W Xenon arc lamp or 250 W slide projector with halogen lamp), electron-transfer-catalyzed Diels-Alder reaction between indole and substituted 1,3-cyclohexadienes, if acyl chlorides are used as trapping agents. Thus 9-acyl- 4,4a,9,9a-tetrahydro-1,4-ethano-1H-carbazoles are generated in one step (6 examples) with practically total regioselectivity, such that a substituent in the 1-position of the 1,3-cyclohexadiene is always found in the 1-position of the tetrahydrocarbazole.

This publication has 0 references indexed in Scilit: