Application of 2-(2-chloroaroyl)methyleneimidazolidines in domino and multicomponent reaction: new entries to imidazo[1,2-a]pyridines and benzo[b]imidazo[1,2,3-ij][1,8]naphthyridines
作者:Li-Rong Wen、Cui-Yu Jiang、Ming Li、Li-Juan Wang
DOI:10.1016/j.tet.2010.11.049
日期:2011.1
A new strategy for the synthesis of tetrahydroimidazo[1,2-a]pyridines and unusual tetrahydrobenzo[b]imidazo[1,2,3-ij][1,8]naphthyridines has been successfully developed by cascade reactions including Knoevenagel condensation, aza–ene reaction, imine–enamine tautomerization, cyclocondensation/oxidation, and intramolecular SNAr of precursors 2-(2-chloroaroyl)methyleneimidazolidines as new heterocyclic
通过Knoevenagel缩合,氮杂等级联反应,成功开发了合成四氢咪唑并[1,2- a ]吡啶和不寻常的四氢苯并[ b ]咪唑并[1,2,3- ij ] [1,8]萘啶的新策略。-烯反应,亚胺-烯胺互变异构,环缩合/氧化和分子内S N作为新的杂环烯酮缩醛(HKA)的前体2-(2-氯芳酰基)亚甲基咪唑烷的Ar,代表一类多官能支架,在温和条件下具有四个与芳族醛和丙二腈或2-氰基乙酸乙酯的活性反应位点。在此多米诺反应中,涉及9个不同的活性位点,并构建了2个C–C键,2个C–N键和2个新的环,所有反应物均有效地用于化学转化。