An easy access to pyrimidine-fused azocine derivatives by thiophenol-mediated radical cyclization via 8-endo-trig mode
作者:K.C. Majumdar、Shovan Mondal、Debankan Ghosh
DOI:10.1016/j.tetlet.2009.11.020
日期:2010.1
An efficient route for the synthesis of eight-membered nitrogen heterocycles has been developed via a thiophenol-mediated intramolecular 8-endo-trig radical cyclization. The radical precursors were prepared using BF3·Et2O-catalyzed aza-Claisenrearrangement followed by the reaction with propargyl bromide. The alkenyl radicals are generated from thiophenol initiated by the benzoyl peroxide instead of