Controllable Site-Selective Construction of 2- and 4-Substituted Pyrimido[1,2-<i>b</i>]indazole from 3-Aminoindazoles and Ynals
作者:Xiang Liu、Jinlei Zhou、Jiatong Lin、Zemin Zhang、Suying Wu、Qiuxing He、Hua Cao
DOI:10.1021/acs.joc.1c01094
日期:2021.7.2
straightforward and novel controllable site-selective construction of 2- and 4-substituted pyrimido[1,2-b]indazole from 3-aminoindazoles and ynals has been developed. The high regioselectivity of this reaction could be easily switched by converting different catalytic systems. In this way, a series of 2- and 4-substituted pyrimido[1,2-b]indazole derivatives were obtained in moderate to good yields. In addition, the
已经开发出一种由 3-氨基吲唑和 ynals 直接且新颖的可控位点选择性构建 2-和 4-取代的嘧啶并[1,2 -b ]吲唑的方法。该反应的高区域选择性可以通过转换不同的催化体系轻松切换。通过这种方式,以中等至良好的收率获得了一系列2-和4-取代的嘧啶并[1,2- b ]吲唑衍生物。此外,还讨论了本方法制备的化合物3a的光物理性质。