Synthesis of α-Acyl-Functionalized Azacycles by Pd-Catalyzed Cross-Coupling Reactions of α-Alkoxyboronates with Lactam-Derived Vinyl Triflates
作者:Ernesto G. Occhiato、Cristina Prandi、Alessandro Ferrali、Antonio Guarna、Annamaria Deagostino、Paolo Venturello
DOI:10.1021/jo025930a
日期:2002.10.1
Alkoxydienyl- and alkoxystyrylboronates were used for Pd-catalyzed cross-coupling reactions with lactam-derived vinyl triflates. The hydrolysis of the coupling products with alkoxystyrylboronates provided the corresponding (x-acyl-substituted 3,4-dihydro-(2H)-pyridines and 2,3,4,5-tetrahydroazepines in good to high yields. The hydrolysis of the coupling products with alkoxydienylboronates, performed in the presence of Amberlyst 15, resulted in a Nazarov-type cyclization that afforded hexahydro[1]pyrindin-7-ones and 3,4,5,6,7,8-hexahydro-(2H)-cyclopenta[b]azepin-8-ones. This methodology represents a novel and efficient procedure for the preparation of these classes of azacyclic compounds.