Here we summarise our results for SmI2-induced 5-exo-trig to 8-exo-trig reductive cyclisations of suitably substituted indole and pyrrole derivatives. All precursors were easily prepared by simple N-alkylation or N-acylation of indole and pyrrole derivatives with the corresponding iodo alkanones, acid chlorides or lactones. The SmI2-induced cyclisations in most cases provided tri- and tetracyclic derivatives
Palladium-Catalyzed Direct Oxidative C–H Activation/Annulation for Regioselective Construction of <i>N</i>-Acylindoles
作者:Raju S. Thombal、Yong Rok Lee
DOI:10.1021/acs.orglett.0c00877
日期:2020.5.1
A Pd(II)-catalyzed C(sp3)-H/C(sp2)-H coupling/annulation of anilides and α-dicarbonyl compounds for the synthesis of diverse N-acyl indoles is described. The reaction is achieved by cascade C-Hactivation, coupling, and intramolecular cyclization. This protocol provides a variety of indoles with high functional group tolerance and excellent regioselectivity. The utility of this protocol is demonstrated