Intramolecular Michael-type addition of azadienes to 1,4-naphthoquinones instead of Aza-Diels–Alder cycloaddition: a synthesis of ascididemin
作者:Juan M. Cuerva、Diego J. Cárdenas、Antonio M. Echavarren
DOI:10.1039/b202555h
日期:2002.5.23
α,β-Unsaturated hydrazones tethered by an amino group to 1,4-naphthoquinone or quinoline-5,8-dione do not react by intramolecular aza-DielsâAlder cycloaddition. Instead, these substrates cyclize to form benzo[b]acridine-6,11-dione or pyrido[2,3-b]acridine-5,12-dione derivatives, respectively. This route leads to a highly concise synthesis of the pyridoacridine alkaloid ascididemin.
与氨基连接的α,β-不饱和肼酮与1,4-萘醌或喹啉-5,8-二酮并不会通过分子内氮杂Diels–Alder环加成反应。相反,这些底物会环化形成苯并[b]氨基芴-6,11-二酮或吡啶[2,3-b]氨基芴-5,12-二酮衍生物。该路线实现了吡啶氨基芴生物碱ascididemin的高效合成。