Biomimetic synthesis of (−)-chaetominine epimers via copper-catalyzed radical cyclization
作者:Xu Deng、Kangjiang Liang、Xiaogang Tong、Ming Ding、Dashan Li、Chengfeng Xia
DOI:10.1016/j.tet.2014.09.029
日期:2015.6
toward (−)-chaetominine via copper-catalyzed radical cyclization are reported. Both of the pyrido[2,3,b]-indole ring (C ring) and imidazolidinone (D ring) are efficiently constructed in one-pot manner. It's unveiled that the newly formed stereo center is controlled by the chiral of alanine, not by tryptophan. With these synthetic discoveries, highly efficient and diastereoselective synthesis of (+)-2
据报道,通过铜催化的自由基环化合成了对(-)-chaetominine的合成方法。吡啶并[2,3,b ]-吲哚环(C环)和咪唑啉酮(D环)均以一锅法有效地构建。据透露,新形成的立体声中心是由丙氨酸的手性控制的,而不是由色氨酸控制的。通过这些合成发现,实现了(+)-2,3,14- epi -chaetominine 5和(-)-11- epi- chaetominine 11的高效且非对映选择性的合成。