Synthesis of Tricyclic Aromatic Compounds by the Intramolecular Pauson−Khand Reaction Promoted by Molecular Sieves<sup>,</sup><sup>1</sup>
作者:Leticia Pérez-Serrano、Jaime Blanco-Urgoiti、Luis Casarrubios、Gema Domínguez、Javier Pérez-Castells
DOI:10.1021/jo0001232
日期:2000.6.1
Pauson-Khand reactions are carried out with different substituted aromatic enynes, yielding tricyclic cyclopentenones related to natural products such as chromenes. Enynes are easily obtained in a two-step approximation from the corresponding salicylaldehydes. The reaction is promoted by dissolved TMANO (trimethylamine N-oxide) and/or 4 A molecular sieves. This new way of induction for the Pauson-Khand
用不同的取代芳族烯炔进行Pauson-Khand反应,生成与天然产物(例如色烯)有关的三环环戊烯酮。从相应的水杨醛通过两步近似即可轻松获得烯炔。溶解的TMANO(三甲胺N-氧化物)和/或4 A分子筛可促进反应。Pauson-Khand反应的这种新的诱导方式显着提高了收率,允许某些取代的烯烃在没有沸石的情况下无法反应。观察到环戊烯酮环的双键的异构化,除了使用非末端三键时。对于三取代的烯烃,观察到中断的Pauson-Khand过程,产率中等。