A Visible Light Photocatalytic Cross-Dehydrogenative Coupling/Dehydrogenation/6π-Cyclization/Oxidation Cascade: Synthesis of 12-Nitroindoloisoquinolines from 2-Aryltetrahydroisoquinolines
作者:Fabian Rusch、Lisa-Natascha Unkel、Dirk Alpers、Frank Hoffmann、Malte Brasholz
DOI:10.1002/chem.201500612
日期:2015.6.1
A visible light‐induced photocatalytic dehydrogenation/6π‐cyclization/oxidation cascade converts 1‐(nitromethyl)‐2‐aryl‐1,2,3,4‐tetrahydroisoquinolines into novel 12‐nitro‐substituted tetracyclic indolo[2,1‐a]isoquinoline derivatives. Various photocatalysts promote the reaction in the presence of air and a base, the most efficient being 1‐aminoanthraquinone in combination with K3PO4. Further, the
可见光诱导的光催化脱氢/6π环化/氧化级联反应将1-(硝基甲基)-2-芳基-1,2,3,4-四氢异喹啉转化为新型的12-硝基取代的四环吲哚[2,1- a ]异喹啉衍生物。各种光催化剂可在空气和碱的存在下促进反应,最有效的是将1-氨基蒽醌与K 3 PO 4结合使用。此外,通过扩展单锅程序与前述的光催化交叉脱氢偶联反应,可直接从C1未官能化的2‐芳基1,2,3,4‐四氢异喹啉中直接获得12‐硝基吲哚异喹啉产物,从而产生四级联反应转型。