A Sequential Pummerer−Diels−Alder Route for the Generation and Trapping of Furo[3,4-<i>c</i>]pyridines: Synthesis of Heterocyclic Analogues of 1-Arylnaphthalene Lignans
作者:Tarun K. Sarkar、Niranjan Panda、Sankar Basak
DOI:10.1021/jo0344081
日期:2003.9.1
looked upon as a heterocyclicanalogue of 1-arylnaphthalene lignans. This procedure occurs readily with electron-poor dienophiles and the entire sequence can be run in one pot. The facility of the sequential Pummerer-Diels-Alder reaction hinges on the experimental conditions, the best results being obtained with heptafluorobutyric anhydride as the triggering agent in toluene containing a catalytic amount