Synthesis of a 3-(α-Styryl)benzo[<i>b</i>]-thiophene Library via Bromocyclization of Alkynes and Palladium-Catalyzed Tosylhydrazones Cross-Couplings: Evaluation as Antitubulin Agents
作者:Bret Tréguier、Marie Lawson、Guillaume Bernadat、Jérôme Bignon、Joëlle Dubois、Jean-Daniel Brion、Mouad Alami、Abdallah Hamze
DOI:10.1021/co500115b
日期:2014.12.8
efficiently synthesized by applying a synthetic sequence that allowed introduction of various substituents on aromatic A, B, and C-rings. The strategy developed involves the synthesis of 3-bromobenzo[b]thiophene derivatives through a bromocyclization step of methylthio-containing alkynes using N-methylpyrrolidin-2-one hydrotribromide reagent (MPHT). Further coupling of 3-bromobenzothiophenes under palladium-catalysis
通过应用允许在芳族A,B和C-上引入各种取代基的合成序列,有效合成了具有高水平分子多样性的功能化3-(α-苯乙烯基)-苯并[ b ]噻吩文库戒指。所开发的策略涉及通过使用N-甲基吡咯烷基-2-酮氢三溴化试剂(MPHT)通过含甲硫基炔烃的溴环化步骤合成3-溴苯并[ b ]噻吩衍生物。钯催化下的3-溴苯并噻吩与N-甲苯磺酰hydr的进一步偶联有效地提供了2-芳基-3-(α-苯乙烯基)苯并[ b噻吩衍生物。研究了目标化合物的抗增殖特性。其中,化合物5m对HCT-116细胞系表现出亚微摩尔的细胞毒活性,并在微摩尔水平上可与CA-4相比抑制微管蛋白的聚合。