螺[4 H-茚并[1,2 - b ]吡啶-4,3 ′-[3 H ]吲哚]和螺[ ac ] -1(2 H),4′-[4 H -茚并[1,2- b ]吡啶]是通过茚满-1,3-二酮,1,3-二羰基化合物,靛红(= 1 H-吲哚-2,3-二酮)或1,2据报道,在催化量的吡啶存在下,二甲苯和AcONH 4在回流的甲苯中。
thermogravimetric analysis (TGA) revealed that the amount of organic compounds grafted on the surface of FSi–PrNH2 and FSi–PrNH–BuSO3H was 2.59 and 1.12 mmol/g, respectively. After well characterizing the FSi–PrNH–BuSO3H, it was used to catalyze the reaction of 1,3-indandione, isatin, ethyl acetoacetate, and ammonium acetate for synthesis of azafluorenone derivatives. Graphical abstract