by the electron-donating properties of the starting heterocycle. The generated imidazo[1,2]hetarylglyoxylates undergo standard transformations typical of α-keto esters upon reaction with various nucleophiles. All the products contain an imidazoheterocyclic scaffold which is considered a privileged structure for drug discovery. imidazoheterocycles - acylation - glyoxylates - privileged scaffolds
Microwave-Assisted Expedite Synthesis of 2-Phenylimidazo[1,2-<i>a</i>]pyridylquinoxalin-2(1<i>H</i>)-ones
作者:Rajeev Sakhuja、S. M. Abdul Shakoor、Santosh Kumari、Anil Kumar
DOI:10.1002/jhet.2189
日期:2015.5
An efficient methodology has been developed for the synthesis of quinoxalin‐2(1H)‐one derivatives of 2‐phenylimidazo[1,2‐a]pyridines by microwave‐irradiated Hinsberg heterocyclization between 2‐phenylimidazo[1,2‐a]pyridine‐3‐glyoxalates and o‐phenylenediamine using either montmorillonite K‐10 or Yb(OTf)3 as catalysts. Montmorillonite K‐10 was proven to be an efficient catalyst for the heterocyclization