Simple <i>Aza</i>-Conjugate Addition Methodology for the Synthesis of Isoindole Nitrones and 3,4-Dihydroisoquinoline Nitrones
作者:Lucy R. Peacock、Robert S. L. Chapman、Adam C. Sedgwick、Mary F. Mahon、Dominique Amans、Steven D. Bull
DOI:10.1021/acs.orglett.5b00103
日期:2015.2.20
reactive N-hydroxy-carbinolamine intermediates that undergo intramolecular aza-conjugate addition reactions to afford isoindole nitrones and 3,4-dihydroisoquinoline nitrones in good yield. Conditions have been developed to reduce these isoindole nitrones to their corresponding hydroxylamine, enamine, and amine derivatives. Isoindole nitrones react with dimethyl acetylenedicarboxylate (DMAD) via a [4
含有邻位取代的α,β-不饱和羧酸衍生物的芳醛与羟胺反应,以提供反应性的N-羟基-甲醇胺中间体,使它们进行分子内的氮杂-共轭加成反应,从而以高收率获得异吲哚腈和3,4-二氢异喹啉腈。已经开发了将这些异吲哚腈还原为它们相应的羟胺,烯胺和胺衍生物的条件。异吲哚硝酮通过[4 + 2]-环加成/脱氨基途径与乙酰二甲酸二甲酯(DMAD)反应,得到取代的萘衍生物,而3,4-二氢异喹啉硝酮通过[1,3]-偶极环加成途径与DMAD反应,得到萘衍生物。三环杂芳烃。