Free-amine-directed alkenylation of C(sp2)-H and cycloamination by palladium catalysis.
A new protocol for the palladium-catalyzed free-amine-directed alkenylation of C(sp(2))-H bonds and cycloamination is described. Substituted biaryl-2-amines react with various alkenes, including electron-deficient alkenes, aryl alkenes and alkyl alkenes, to give the corresponding phenanthridines with exclusive regioselectivity. The use of α-branched styrenes leads to the formation of tricyclic compounds with a seven-membered amine ring. The method operates through a free-amine-directed alkenylation and a subsequent hydroamination cyclization reaction.
Department of Chemistry, Zhejiang University, Hangzhou, PR China.
Zunjun
Z
Liang
Long
L
Ju
Yongju
Y
Xie
Lehao
L
Huang
Yuhong
Y
Zhang