Synthesis of Di- and Tetra-Sulfonated Heterocyclic Compounds by Crisscross Cycloaddition Reactions
作者:Augusto C. Tomé、José A. S. Cavaleiro、Fernando M. J. Domingues、Richard J. Cremlyn
DOI:10.1080/104265090930362
日期:2005.12
Using sulfonated diaryl azines and sulfonated N-arylmaleimides as starting reagents, a range of di- and tetra-sulfonated crisscross cycloadducts were selectively prepared. While the di-sulfonated adducts were obtained by carrying out the cycloaddition reaction in solution, the tetra-sulfonated adducts could be obtained only by fusion of the two reagents in the absence of solvent. The stereoisomers of the sulfonated cycloadducts were separated by preparative TLC.