Synergy between Heterogeneous Catalysis and Microwave Irradiation in an Efficient One-Pot Synthesis of Benzene Derivatives via Ring-Opening of Diels-Alder Cycloadducts of Substituted Furans
作者:Antonio de la Hoz、Angel Díaz-Ortiz、José María Fraile、María Victoria Gómez、José Antonio Mayoral、Andrés Moreno、Alfonso Saiz、Ester Vázquez
DOI:10.1055/s-2001-14580
日期:——
The use of silica-supported Lewis acids as catalysts under microwave irradiation promotes regiospecific opening of the 7-oxa bridge of Diels-Alder cycloadducts, producing the corresponding arenes in a single step. This rapid and efficient procedure permits the synthesis of 1,2-, 1,2,4- and 1,2,3,4-substituted benzenes by reaction of 2,5-dimethylfuran (1), 2-methoxyfuran (2) and 2-ethylfuran (3) with dienophiles such as acrylonitrile, methyl acrylate, N-methylmaleimide and fumaronitrile.
在微波辐照下使用二氧化硅支撑的路易斯酸作为催化剂,可促进 Diels-Alder 环加载产物的 7-oxa 桥的特异性打开,从而一步生成相应的炔类化合物。通过这种快速高效的方法,2,5-二甲基呋喃(1)、2-甲氧基呋喃(2)和 2-乙基呋喃(3)可与丙烯腈、丙烯酸甲酯、N-甲基马来酰亚胺和富马腈等二烯烃反应,合成 1,2-、1,2,4- 和 1,2,3,4-取代的苯。