Abstract
A facile and efficient route to synthesize quinoxalinone and benzimidazopyrazinone was developed via two paths of a post-Ugi cascade reaction. By simply alternating the order of nucleophilic substitution reactions, both heterocycles could be accessed selectively from the same Ugi adduct. Microwave-assisted synthesis protocol provided these compounds with one purification procedure for three steps. These two scaffolds with more possible spaces for further modifications provide great benefit toward combinatorial and medicinal chemistry campaigns.
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Acknowledgements
The authors would like to thank the Chongqing Research Program of Basic Research and Frontier Technology (cstc2015jcyjA1328 and cstc2015zdcy-ztzx0191) and the Scientific Research Foundation of the Chongqing University of Arts and Sciences (Grant Nos. R2013XY01, R2013XY02 and M2016ME11). We would also like to thank Ms H.Z. Liu for obtaining the LC/MS and NMR data.
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Song, GT., Li, Y., Xu, J. et al. Microwave-assisted facile construction of quinoxalinone and benzimidazopyrazinone derivatives via two paths of post-Ugi cascade reaction. Mol Divers 23, 137–145 (2019). https://doi.org/10.1007/s11030-018-9855-y
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DOI: https://doi.org/10.1007/s11030-018-9855-y