reaction of substituted furans with reactive dienophiles (i.e., dimethyl acetylenedicarboxylate (DMAD) and dimethyl maleate). Regiospecific furano Diels−Alder cycloaddition of 2-vinylic furans with DMAD furnished functionalized oxabicyclic alkenes in good yield under ultrasonication condition.
超声波辐照有效地促进了取代
呋喃与反应性亲二烯物(即,
乙炔二
羧酸二甲酯(
DMAD)和
马来酸二甲酯)的狄尔斯-阿尔德反应。在超声条件下,具有
DMAD的
2-乙烯基呋喃的区域特异性
呋喃诺Diels-Alder环加成反应提供了功能化的氧双环烯烃。