Transition metal complexes of diazenes XLI: cobalt catalyzed addition of internal alkynes to 1,2-diaryldiazenes: formation of 2,3-dihydrocinnolines, mono- and distilbenylazobenzenes
作者:U. Dürr、F.W. Heinemann、H. Kisch
DOI:10.1016/s0022-328x(98)00404-5
日期:1998.5
selectively this ring is ortho-metalated in the case of cobalt while only the unsubstituted or both rings are attacked in rhodium catalysis. This difference enables a two-step regioselective cobalt catalyzed synthesis of the corresponding N-anilinoindole via isolation of 2-stilbenyl-3,5-difluoroazobenzene and subsequent acid catalyzed rearrangement to the indole derivative. Results obtained with 4-methoxytolan