Preparation of six membered carbocycles by aryl-tellurium mediated free-radical cyclisation
作者:Derek H.R. Barton、Peter I. Dalko、Stephan D. Géro
DOI:10.1016/s0040-4039(00)92289-5
日期:1991.1
Radical cyclisation of various telluro-compounds was examined. Olefins conjugated to an electron withdrawing group, (7, 8, 9, 10, and 11) gave high yields of the corresponding six membered products. Non-activated olefin 23 gave the corresponding thiopyridyl derivative 24 as the only product. The photolysis, using oxime 18 as radicophile for the cylisation, proceeded slowly at room temperature, and