Richter cyclization and co-cyclization reactions of triazene-masked diazonium ions
作者:Annelies Goeminne、Peter J. Scammells、Shane M. Devine、Bernard L. Flynn
DOI:10.1016/j.tetlet.2010.10.122
日期:2010.12
(aq) (X = Br or Cl) and NaNO2, followed by spontaneous ring closure to give a mixture of 4-halocinnoline and 4-cinnolinone products. The different products result from competing attack of X− and H2O, respectively, upon an intermediate 2-alkynylphenyl diazoniumion during the cyclization step. In order to improve the chemoselectivity of this reaction, we have utilized triazenes as masked diazonium ions