Synthesis of Vinylogous Amides by Gold(I)-Catalyzed Cyclization of <i>N</i>-Boc-Protected 6-Alkynyl-3,4-dihydro-2<i>H</i>-pyridines
作者:Alberto Oppedisano、Cristina Prandi、Paolo Venturello、Annamaria Deagostino、Giulio Goti、Dina Scarpi、Ernesto G. Occhiato
DOI:10.1021/jo4019914
日期:2013.11.1
The gold(I)-catalyzedcyclization of N-Boc-protected 6-alkynyl-3,4-dihydro-2H-pyridines, prepared by the Sonogashira coupling of lactam-derived enol triflates or phosphates, provides vinylogous amides, which are useful intermediates in the synthesis of natural compounds. The Au(I)-catalyzed reaction is carried out with Ph3PAuOTf as a catalyst and proceeds via a 6-endo-dig cyclization to form a vinylgold