Synthesis of Indoles upon Sequential Reaction of 3-Alkynylpyrrole-2-carboxaldehydes with Iodonium Ions and Alkenes. Preparation of Related Benzofuran and Benzothiophene Derivatives
作者:José Barluenga、Henar Vázquez-Villa、Alfredo Ballesteros、José M. González
DOI:10.1002/adsc.200404293
日期:2005.3
Di- and trisusbstituted indoles 2 have been prepared by reaction of pyrroles 1 with alkenes via iodonium-induced benzannulationreaction. Enamines and enol ethers are also useful partners in that cyclisation process. This regioselective transformation can be easily adapted to prepare related benzofuran and benzothiophene skeletons.