Cycloaddition reactions of quinoneimine N-oxides and of fluorenoneimine N-oxide: exocyclic nitrones conjugated with electron-withdrawing rings
作者:Jaffar A. Damavandy、Richard A. Y. Jones
DOI:10.1039/p19810000712
日期:——
N-Phenyl-p-benzoquinoneimine N-oxide is generally unreactive in 1,3-dipolar cycloaddition reactions, but with acetylenedicarboxylate esters it gives indolones, formed from the initial adducts by a rearrangement which entails an alkoxycarbonyl migration. The analogous nitrone derived from anthraquinone gives unrearranged adducts with a variety of 1,3-dipolarophiles; monosubstituted alkynes and alkenes
N-苯基-对-苯并醌亚胺N-氧化物通常在1,3-偶极环加成反应中不反应,但是与乙炔二羧酸酯一起生成吲哚酮,其由初始加合物通过重排形成,该重排需要烷氧基羰基迁移。衍生自蒽醌的类似硝酮可与多种1,3-双极性亲和剂产生未重排的加合物。单取代的炔烃和烯烃得到4-取代的异恶唑啉和-异恶唑烷。芴酮亚胺N-氧化物的行为类似。我们还描述了一些二苯环丙烯酮的反应,这些反应是为了制备环丙烯酮亚胺N-氧化物而进行的。