Synthesis of Phenanthrenes through Visible-Light Photoredox Catalyzed Intramolecular Cyclization of α-Bromochalcones
作者:Savita B. Nagode、Ruchir Kant、Namrata Rastogi
DOI:10.1002/ejoc.201800011
日期:2018.4.9
A simple synthesis of the phenanthrene scaffold from α‐bromochalcones under visible‐light photoredox catalysis is described. The corresponding α‐keto vinyl radicals are generated under irradiation with blue light in the presence of photocatalyst fac‐[Ir(ppy)3]. The radical subsequently undergoes intramolecular cyclization with the ortho‐aryl/heteroaryl ring to afford the phenanthrene scaffold.
Synthesis of Substituted Phenanthrene by Iron(III)-Catalyzed Intramolecular Alkyne–Carbonyl Metathesis
作者:Krishnendu Bera、Soumen Sarkar、Swapnadeep Jalal、Umasish Jana
DOI:10.1021/jo301371n
日期:2012.10.5
An efficient synthesis of functionalized phenanthrenes has been developed for the first time involving an iron(III)-catalyzed intramolecular coupling of 2′-alkynyl-biphenyl-2-carbaldehydes. A broad range of functionalized phenanthrene derivatives could be obtained in the present method in moderate to good yields with high chemo- and regioselectivity. This transformation can also be applied to the synthesis