作者:Xiaoyuan Ding、Son T. Nguyen、John D. Williams、Norton P. Peet
DOI:10.1016/j.tetlet.2014.10.114
日期:2014.12
Diels-Alder reactions of five-membered heterocycles containing one heteroatom with an N-arylmaleimide were studied. Cycloaddition of 2,5-dimethylfuran (4) with 2-(4-methylphenyl)maleimide (3) in toluene at 60 degrees C gave bicyclic adduct 5. Cycloadditions of 3 with 2,5-dimethylthiophene (11) and 1,2,5-trimethylpyrrole (14) were also studied. Interestingly, the bicyclic compound 5 cleanly rearranged
研究了含有一个杂原子的五元杂环与N-芳基马来酰亚胺的Diels-Alder反应。2,5-二甲基呋喃(4)与2-(4-甲基苯基)马来酰亚胺(3)在甲苯中于60℃环加成,得到双环加合物5。3与2,5-二甲基噻吩(11)和1,2的环加成,还研究了5-三甲基吡咯(14)。有趣的是,当在80℃下用对甲苯磺酸的甲苯溶液处理时,双环化合物5干净地重排,而没有水,得到4,7-二甲基-2-对甲苯基吲哚啉-1,3-二酮(6)。