A novel coupling reaction of 3-substituted 4-alkoxy and 4-aminocyclobutene-1,2-diones induced by TiCl4–Zn
作者:Jie Wang、Xin Jiang、Ming Chen、Yuefei Hu、Hongwen Hu
DOI:10.1016/s0022-328x(01)00811-7
日期:2001.6
The coupling of 3-substituted 4-alkoxy or 4-aminocyclobutene-1,2-diones induced by TiCl4-Zn was studied. It is interesting to and that the double bonds involved in the coupling reaction and the unsymmetrical coupling compounds were obtained as major or sole products. A possible mechanism mediated by titanium coordination intermediates is proposed. (C) 2001 Published by Elsevier Science B.V.