Versatile synthesis of 4-spiro-β-lactam-3-carbonitriles via the intramolecular nucleophilic cyclization of N-(p-hydroxyphenyl)cyanoacetamides
作者:Hassane Abdellaoui、Jiaxi Xu
DOI:10.1016/j.tet.2014.05.008
日期:2014.7
yields via the intramolecular nucleophilic cyclization of N-(p-hydroxyphenyl)cyanoacetamides with iodobenzene diacetate (IBD) as oxidant and potassium hydroxide as base. Acetic 4-spiro-cyclohexadienonyl-β-lactam-3-carbimidic anhydrides were obtained when organic base triethylamine was applied instead of potassium hydroxide. The mechanisms of the intramolecular nucleophilic cyclization and formation
一系列4-螺环己二酮基-β-内酰胺-3-腈,2,7-二氧代-1-氮杂螺[3.5] nona-5,8-二烯-3-腈的合成通过令人满意的至优异的收率。N-(对羟基苯基)氰基乙酰胺的分子内亲核环化反应,以碘化苯二乙酸酯(IBD)为氧化剂,氢氧化钾为碱。当使用有机碱三乙胺代替氢氧化钾时,获得了乙酸4-螺环-环己二烯酰基-β-内酰胺-3-碳二酸酐。提出了分子内亲核环化和乙酸β-内酰胺-3-碳二酸酐的形成机理。环化是亲核ipso的序列加成和氧化脱芳香化作用。乙氨基乙二酸酐的形成是腈中的一种酸催化的乙酸酯。