A microwave-assisted three-component protocol involving N-1 alkylation of 2-alkynylindoles with epichlorohydrin, ring opening of the epoxide with sodium azide, and an intramolecular Huisgen azide–internal alkyne 1,3-dipolar cycloaddition domino sequence has been described. The efficacy of the methodology has been demonstrated by treating various 2-alkynylindoles (aromatic/aliphatic) with epichlorohydrin and sodium azide furnishing annulated tetracyclic indolodiazepinotriazoles in satisfactory yields.
一种微波辅助的三组分方案涉及2-炔基吲哚的N-1烷基化与环氧氯丙烷的环开反应,以及内部炔烃-1,3-双极环加成的分子内Huisgen叠氮化合物的串联序列。该方法的有效性已通过处理各种2-炔基吲哚(芳香族/脂肪族)与环氧氯丙烷和叠氮化钠,产生了合格的环丁二嗪三唑并环四环吲哚衍生物的收率来证明。