Ionic diamine rhodium complex catalyzed reductive N-heterocyclization of 2-nitrovinylarenes.


Ionic diamine rhodium complex (1) catalyzes the reductive N-cyclization of 2-vinylnitroarenes using carbon monoxide as a reducing agent to afford functionalized indoles. The catalytic system allows direct access to indoles with ester and ketone groups at the 2- or 3-position, in good yields. 
DOI: 10.1021/jo200320k