Synthesis of Oxacycles by Tandem Radical Addition−Cyclization Reactions
作者:Mukund P. Sibi、Kalyani Patil、Tara R. Rheault
DOI:10.1002/ejoc.200300063
日期:2004.1
β-Alkoxyalkylidenemalonates undergo tandemradicaladdition−cyclizationreactions to provide oxacycles of different ring sizes in good chemical efficiency. A variety of nucleophilic radicals participate in the addition−cyclizationreactions, and the reaction requires the use of lanthanide triflates as Lewis acids. Compound 9 gave the 5-exo cyclization product 13 in 80 % yield and greater than 50:1