Aza-Annulation of Enynyl Azides: A New Approach to Substituted Pyridines
作者:Chada Raji Reddy、Sujatarani A. Panda、Motatipally Damoder Reddy
DOI:10.1021/ol503752k
日期:2015.2.20
Synthesis of substitutedpyridines through a novel aza-annulation of 2-en-4-ynyl azides, derived from MBH-acetates of acetylenic aldehydes, is described. A variety of enynyl azides having aryl, heteroaryl, and alkyl groups on the alkyne functionality successfully participated in the Ag-mediated annulation reaction to provide the corresponding 3,6-disubstituted pyridines. I2-Mediated cyclization was
Oxidative Aza-Annulation of Enynyl Azides to 2-Keto/Formyl-1<i>H</i>-pyrroles
作者:Chada Raji Reddy、Sujatarani A. Panda、Andhavaram Ramaraju
DOI:10.1021/acs.joc.6b02468
日期:2017.1.20
the intramolecular oxidative aza-annulation of enynyl azides is reported for the first time. It involves a sequential carbon–nitrogen/carbon–oxygen bond formations, and the combination of AuCl3 with AgSbF6 was identified as a suitable reagent system to promote the present reaction. The required enynyl azides are readily prepared from Morita–Baylis–Hillman (MBH) acetates of acetylenic aldehydes.