Free radical macrocyclisation via propiolate esters.
作者:Jack E. Baldwin、Robert M. Adlington、Steve H. Ramcharitar
DOI:10.1016/0040-4020(92)85015-7
日期:1992.1
Intramolecular free-radical addition to propiolate esters has provided a new and a stereoselective route to 14–16 membered -α,β-unsaturated macrocylic lactones from their corresponding ω-iodoalkyl-propionate esters under triphenyltin hydride/AIBN mediated conditions. Attemps to synthesise analogous 10–13 membered lactones proved unsuccessful, resulting in acyclic products derived from direct reduction at the
丙内酯中的分子内自由基加成为三苯基锡氢化物/ AIBN介导的条件下从其相应的ω-碘烷基-丙酸酯中生成14–16元-α,β-不饱和大环内酯提供了一条新的立体选择路线。尝试合成类似的10-13元内酯的尝试均未成功,导致在自由基中心直接还原而得的无环产物。