A silver Lewis acid catalyzes dearomative [2π+2σ] cycloadditions of N-unprotected indoles and bicyclobutanes to afford indoline fused bicyclo[2.1.1]hexanes (BCHs) bearing up to four contiguous quaternary carbon centers in high yields and with an opposite regioselectivity compared to the classical pathway.
Palladium-Catalyzed Direct 2-Alkylation of Indoles by Norbornene-Mediated Regioselective Cascade C–H Activation
作者:Lei Jiao、Thorsten Bach
DOI:10.1021/ja2055066
日期:2011.8.24
A palladium-catalyzed direct 2-alkylation reaction of free N-H indoles has been developed. This reaction relies on a norbornene-mediated cascade C-H activation process at the indole ring, which features high regioselectivity and excellent functional group, tolerance. The reaction represents the first example for a generally applicable, direct C-H alkylation of indole at the 2-position.