Reaction of (E)-β-enamino amides with dimethyl acetylenedicarboxylate (DMAD): formation of benzene derivatives, enamino esters, and 2-pyridones
作者:Antonio Nuvole、Giuseppe Paglietti
DOI:10.1039/p19890001007
日期:——
An investigation of the additions of (E)-enamino amides (1a–d) with DMAD has shown that they are influenced by the stereochemistry of the intermediates and the amine component of the enamine system. In dryacetonitrile (E)-benzyl(methyl)amino-(1b), (E)-pyrrolidin-1-ylamino-(1c), and (E)-piperidin-1-ylamino-(1d) acrylamides, following a known mechanism, yielded tetramethyl benzene-1,2,3,4-tetracarboxylate
(的加法调查ë)-enamino酰胺(1A - d)与DMAD已经表明,它们是由中间体的立体化学和烯胺系统的胺成分的影响。在干乙腈中,(E)-苄基(甲基)氨基-(1b),(E)-吡咯烷-1-基氨基-(1c)和(E)-哌啶-1-基氨基-(1d)丙烯酰胺,得到四甲基苯-1,2,3,4-四羧酸酯(5),(E)-氨基丁烯二酸酯(6b - d)和3,4-双甲氧基羰基吡啶-2-(1 H)-一8)。由于β-碳的不同亲核性,二甲氨基-(1a)和吗啉-1-基氨基-(1e)-丙烯酰胺形成了两性离子(11),该两性离子消除了丙醇酰胺,仅得到(E)-氨基丁烯二酸酯(6a,e)。