A versatile synthesis of diverse 3,4-fused cinnolines via the base-catalysed condensation of 2-amino-2′-nitrobiaryls
作者:Åsa Slevin、Tobias Koolmeister、Martin Scobie
DOI:10.1039/b618318b
日期:——
Benzo[c]cinnolines, thieno[3,2-c]cinnolines, pyrido[3,2-c]cinnolines and the previously undescribed quinoxalino[6,7-c]cinnolineringsystem are conveniently prepared by a short synthetic route comprised of Suzuki coupling, base-catalysed cyclisation and deoxygenation. The use of tandem borylation-Suzuki coupling further extends the scope of this process to include highly substituted benzo[c]cinnolines
studies. Furthermore, time-dependent electrospray ionization mass spectrometry (TD ESI-MS) was applied to track the process by detecting most intermediates. The complex [CuIII(iodobiphenyl)(bipy)I]+ (Int-C) was detected for the first time, giving evidence for oxidative addition of cyclic iodonium to Cu catalyst. Another complex [CuI(PHA)(bipy)] (Int-B) via ligand-exchange between the hydrazide and Cu catalyst
报道了一种酸酐促进的无痕肼-I/Br 交换策略,其中水合肼和环状/线性碘鎓(包括很少探索的环状溴鎓)在一个锅中转化为苯并 [ c ] 肉啉/偶氮苯。该反应通过二酰化(第一和第二个 C─N 形成)、 N , N'-二芳基化(第三和第四个 C─N 形成)和脱酰/氧化(2 个 C─N 裂解和 1 个 N=N 形成)进行。通过分离多个中间体和动力学研究来研究反应机理。此外,应用时间依赖性电喷雾电离质谱 (TD ESI-MS) 通过检测大多数中间体来跟踪过程。络合物 [Cu III (iodobiphenyl)(bipy)I] + (Int-C )首次被检测到,为环碘鎓氧化加成Cu催化剂提供了证据。还检测到另一种络合物 [Cu I (PHA)(bipy)] ( Int-B ) 通过酰肼和 Cu 催化剂之间的配体交换,表明双路径初始活化过程。
GAIT S. F.; PEEK M. E.; REES C. W.; STORR R. S., J. CHEM. SOC. PERKIN TRANS. <JCPK-BH>, 1975, PART 1, NO 1, 19-25
作者:GAIT S. F.、 PEEK M. E.、 REES C. W.、 STORR R. S.
DOI:——
日期:——
Lewis, Graham E.; Lill, Donald L., Australian Journal of Chemistry, 1985, vol. 38, # 5, p. 817 - 823