Intramolecular Hydroamidation of <i>ortho</i>
-Vinyl Benzamides Promoted by Potassium <i>tert</i>
-Butoxide/<i>N,N</i>
-Dimethylformamide
作者:Zhen-yu Chen、Liang-yu Wu、Hai-sheng Fang、Ting Zhang、Zhi-feng Mao、Yong Zou、Xue-jing Zhang、Ming Yan
DOI:10.1002/adsc.201700369
日期:2017.11.23
An intramolecular hydroamidation of ortho-vinyl benzamides had been developed. The reaction was promoted efficiently by potassiumtert-butoxide and N,N-dimethylformamide without the need for strong oxidants or transition-metal catalysts. A series of dihydroisoquinolinones and 3-benzylisoindolinones were prepared in good to excellent yields. The new method is operationally simple, scalable, and tolerant
A Visible Light Photocatalytic Cross-Dehydrogenative Coupling/Dehydrogenation/6π-Cyclization/Oxidation Cascade: Synthesis of 12-Nitroindoloisoquinolines from 2-Aryltetrahydroisoquinolines
A visiblelight‐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。
Aerobic α‐Oxidation of N‐Substituted Tetrahydroisoquinolines to Dihydroisoquinolones via Organo‐photocatalysis
作者:Kim Aganda、Boseok Hong、Anna Lee
DOI:10.1002/adsc.201801301
日期:——
An efficient visible‐light‐induced α‐oxidation of N‐substituted tetrahydroisoquinolines to dihydroisoquinolones has been developed using eosinY as an organo‐photocatalyst and oxygen as a green oxidant. The reactions were carried out under mild reaction conditions; the desired dihydroisoquinolones were obtained in up to 96% yield at room temperature under oxygen atmosphere. This transformation provides
A ligand-free iron-catalyzed method for the oxygenation of benzylic sp3 C–H bonds by molecular oxygen (1 atm) using a thiylradical as a cocatalyst has been developed. This transformation provides a facile access to amides, esters and ketones from readily accessible corresponding amines, ethers and alkanes. It features high regioselectivity, mild oxidative conditions and excellent functional group
α-Angelica Lactone in a New Role: Facile Access to <i>N</i>-Aryl Tetrahydroisoquinolinones and Isoindolinones via Organocatalytic α-CH<sub>2</sub> Oxygenation
作者:Thanusha Thatikonda、Siddharth K. Deepake、Utpal Das
DOI:10.1021/acs.orglett.9b00224
日期:2019.4.19
A method for the directoxidation of various N-aryl tetrahydroisoquinolines and isoindolines to the corresponding lactams using α-angelica lactone as a catalyst was developed. The utility of the method was further demonstrated by synthesis of indoprofen and indobufen.