A natural light induced regioselective 6π-electrocyclisation–oxidative aromatisation reaction: experimental and theoretical insights
作者:Benjamin E. Moulton、Hao Dong、Ciara T. O'Brien、Simon B. Duckett、Zhenyang Lin、Ian J. S. Fairlamb
DOI:10.1039/b811284c
日期:——
Stoichiometric intermolecular Pauson-Khand reactions of 4-(phenylethynyl)-6-methyl-2-pyrones with norbornene and dicobalt(0)octacarbonyl provide cyclopentenone products that undergo a facile 6pi-electrocyclisation-oxidative aromatisation transformation in the presence of natural light and oxygen, affording functionalised benzo[h]indeno[1,2-f]isochromene type products. The results are rationalised by
4-(苯基乙炔基)-6-甲基-2-吡喃酮与降冰片烯和二甲双(0)八羰基的化学计量分子间Pauson-Khand反应提供了环戊烯酮产品,该产品在自然光和氧气存在下容易进行6pi-电环化-氧化芳构化转化,提供官能化的苯并[h]茚并[1,2-f]异戊二烯型产品。通过理论研究使结果合理化,这些研究证实了在2吡喃环系统中C3有利于电环化过程。“三烯基”取代基的身份和精确排列控制着电环化是否在自然光下发生。