dihydropyrrole-functionalized phenanthridines were efficiently synthesized by the metal-free, radical cascade cyclization reaction of 2-isocyanobiphenyls with γ,δ-unsaturated oxime esters. The C–N/C–C/C–C bonds were formed via the oil bath method in a one-pot procedure with broad substrate applicability. The radical process was supported by kinetic isotope effect studies and radical inhibition studies.
“Transition-Metal-Free” Synthesis of Carbazoles by Photostimulated Reactions of 2′-Halo[1,1′-biphenyl]-2-amines
作者:Walter D. Guerra、Roberto A. Rossi、Adriana B. Pierini、Silvia M. Barolo
DOI:10.1021/jo5024393
日期:2015.1.16
and simple protocol for the preparation of a series of 9H-carbazoles by photostimulatedSRN1 substitution reactions is presented. Substituted 9H-carbazoles were synthesized in low to excellent yields (up to 96%) through an intramolecular C–N bond formation of 2′-halo[1,1′-biphenyl]-2-amines by the photoinitiated SRN1mechanism under mild and “transition-metal-free” conditions. The biphenylamines used