Facile [2+2] Cycloaddition
of DDQ to an Alkyne: Synthesis of Pyrrolyl- and Indolylbicyclo[4.2.0]octadienes
from C-Ethynylpyrroles or C-Ethynylindoles
Boris A. Trofimov*, Lyubov’ N. Sobenina, Zinaida V. Stepanova, Igor’ A. Ushakov, Lidiya M. Sinegovskaya, Tamara I. Vakul’skaya, Al’bina I. Mikhaleva A. E. Favorsky Irkutsk Institute of Chemistry, Siberian Branch of the Russian Academy of Sciences, 1 Favorsky St., Irkutsk 664033, Russian Federation Fax: +7(3952)419346; e-Mail: boris_trofimov@irioch.irk.ru;