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
检查了各种碲化合物的自由基环化作用。与吸电子基团(7、8、9、10和11)共轭的烯烃得到高产率的相应六元产物。未活化的烯烃23给出相应的硫代吡啶基衍生物24作为唯一产物。使用肟18作为亲核试剂进行环化反应的光解反应在室温下缓慢进行,仅产生了较低的产物19和20收率。