AlCl3–NaI assisted cleavage of polymer-bound esters with concomitant amine coupling and azido-reductive cyclization: synthesis of pyrrolobenzodiazepine derivatives
作者:Ahmed Kamal、S. Prabhakar、Nagula Shankaraiah、Nagula Markandeya、P. Venkat Reddy、Vunnam Srinivasulu、Manda Sathish
DOI:10.1016/j.tetlet.2013.06.033
日期:2013.8
A practical one-pot solid-phase parallel diversity-oriented synthesis (DOS) strategy has been successfully applied for the construction of scaffolds embedded with privileged pyrrolo [2,1-c][1,4]benzodiazepines (PBDs) and their dilactams. The synthetic approach involves AlCl3–NaI assisted cleavage of resin-bound ester, with amine coupling and tandem azido-reductive cyclization as the key step. The maximum
一种实用的一锅固相平行分集合成(DOS)策略已成功地用于构建嵌有特有吡咯并[2,1- c ] [1,4]苯并二氮杂(PBDs)及其双内酰胺的脚手架。合成方法涉及AlCl 3-NaI辅助裂解树脂结合的酯,关键步骤是胺偶联和叠氮叠氮还原环化反应。最大的骨骼多样性已通过在PBD的A-C8位引入不同的连接基来扩展,这些连接基具有来自单个关键中间体的各种取代基。令人欣慰的是,最终化合物已通过固相支持的液-液萃取(SLE)技术进行了纯化。有趣的是,与天然存在的DC-81相比,这些分子中的某些已显示出增强的DNA结合亲和力。这种新颖的方法对于构建用于评估药物发现中生物学特征的新药物候选物是默认的。