Chemoselective C(sp3)-H bond activation for the preparation of condensed N-heterocycles

Abstract

Condensed N-heterocycles were prepared by using C-H activation reactions catalyzed by Pd(OAc)2 (5 mol%) and (p-tolyl)3P (10 mol%). The key step of these ring closures is chemoselective intramolecular C-H activation of the methyl group at position 2 of the pyrrole ring. Functionalized 9H-pyrrolo[1,2-a]indoles and pyrrolo[1,2-f]phenanthridine derivatives were prepared in good yields. The preparation of some complex N-heterocycles by using successive reactions is also described. © 2007 Wiley-VCH Verlag GmbH & Co. KGaA.