Efficient Synthesis of 1-Amino-2-naphthalenecarboxylic Acid Derivatives via a Sequential Michael Addition/Enolate−Nitrile Coupling Route and Its Application to Facile Preparation of 9-Amino Analogues of Arylnaphthofuranone Lignans
作者:Kazuhiro Kobayashi、Tomokazu Uneda、Keiichiro Takada、Hiroto Tanaka、Tomohide Kitamura、Osamu Morikawa、Hisatoshi Konishi
DOI:10.1021/jo961744r
日期:1997.2.1
2-alkylbenzonitriles with LDA in diglyme, with alpha,beta-unsaturated carboxylates and nitriles produced 1-amino-3,4-dihydro-2-naphthalenecarboxylates and carbonitriles in 54-98% yields through Michael addition of the lithio nitriles to alpha,beta-unsaturated carboxylic acid derivatives, followed by zinc iodide-promoted intramolecular enolate-nitrile coupling of the resulting enolate intermediates. The
通过在二甘醇二甲醚中用LDA处理2-烷基苄腈与α,β-不饱和羧酸酯和腈反应原位生成的2-(α-硫代烷基)苄腈与1-氨基-3,4-二氢-2-萘甲酸乙酯和通过将硫代腈迈克尔加成到α,β-不饱和羧酸衍生物上,然后碘化锌促进分子内烯醇盐-腈偶联,生成的烯醇盐中间体以54-98%的产率形成腈。在回流的对甲基苯甲基中用活性炭上的钯脱氢,将二氢萘羧酸衍生物以43-99%的产率转化为相应的1-氨基-2-萘甲酸衍生物。随后,我们表明,通过使用类似的反应顺序,