Synthesis of the Aziridinomitosene Skeleton by Intramolecular Michael Addition of α-Lithioaziridines: An Aromatic Route Featuring Deuterium as a Removable Blocking Group
作者:Edwin Vedejs、Jeremy D. Little
DOI:10.1021/jo030223i
日期:2004.3.1
A convergent synthetic route to the 1,2-aziridinopyrrolo(1,2-a)indole 34 has been developed. Key features of this route include the deuterium kinetic isotope effect to block undesired indole lithiation during tin−lithium exchange from 27a to 30a, the intramolecular Michael addition to generate the enolate 31a, and conversion into 34 by trapping with phenylselenenyl chloride. Reductive cleavage of the
已开发出收敛的合成路线,以合成1,2-叠氮基吡咯并(1,2- a)吲哚34。该途径的关键特征包括氘动力学同位素效应,以阻止锡-锂从27a到30a交换过程中不希望的吲哚锂化;分子内迈克尔加成反应生成烯醇盐31a;以及通过捕获苯基硒烯基氯转化为34。34中的N-三苯甲基的还原性切割允许接近包含氮丙啶NH亚基的四环叠氮基叠氮核糖基。用LAH还原34中的C(9)酯可得到伯醇35具有正确的C(9),C(9a),C(10)氧化态,对应于叠氮芥子酮,并进行34脱保护得到37。