Regioselective Synthesis of Multisubstituted Furans via Metalloradical Cyclization of Alkynes with α-Diazocarbonyls: Construction of Functionalized α-Oligofurans
作者:Xin Cui、Xue Xu、Lukasz Wojtas、Martin M. Kim、X. Peter Zhang
DOI:10.1021/ja309446n
日期:2012.12.12
five-membered furan structures. The Co(II) complex of 3,5-Di(t)Bu-IbuPhyrin, [Co(P1)], is effective in catalyzing the metalloradical cyclization reaction under neutral and mild conditions. The [Co(P1)]-catalyzed process tolerates a wide range of α-diazocarbonyls and terminal alkynes with varied steric and electronic properties, producing polyfunctionalized furans with complete regioselectivity. The catalytic
由 Co(II)-卟啉配合物活化 α-重氮羰基产生的 Co(III)-卡宾自由基已被证明与炔烃发生新型串联自由基加成反应,提供五元呋喃结构。3,5-Di(t)Bu-IbuPhyrin 的 Co(II) 配合物 [Co(P1)] 在中性和温和条件下可有效催化金属自由基环化反应。[Co(P1)] 催化的过程可以耐受各种具有不同空间和电子特性的 α-重氮羰基和末端炔烃,从而产生具有完全区域选择性的多官能化呋喃。催化合成具有高度的官能团耐受性,可以反复应用于构建功能化的α-低聚呋喃。