Palladium(0)-catalyzed Domino C−N Coupling/Hydroamination/C−H Arylation: Efficient Synthesis of Benzothieno[2′,3′:4,5]pyrrolo[1,2-<i>f</i>]phenanthridines
作者:Ghazwan Ali Salman、Ngo Nghia Pham、Thang Ngoc Ngo、Peter Ehlers、Alexander Villinger、Peter Langer
DOI:10.1002/adsc.201601285
日期:2017.4.17
efficient routes to benzothieno[2′,3′:4,5]pyrrolo[1,2‐f]phenanthridines have been developed. Alkynylated benzothiophenes reacted with various anilines to the target compounds in a domino reaction consisting of a C−N coupling‐, hydroamination‐ followed by a final, ring‐closing C−H arylation step. Products were isolated in moderate to good yields.
已开发出两条新的高效途径制备苯并噻吩并[2',3':4,5]吡咯并[1,2- f ]菲啶。炔基化苯并噻吩与各种苯胺在多米诺反应中与目标化合物反应,该反应由CN偶联,加氢胺化,随后的最终闭环CH芳基化步骤组成。分离产物的产率中等至良好。
Domino CN Coupling/Annulation versus CN Coupling/ Hydroamination of 2-Alkynyl-3-bromobenzothiophenes and 2-Alkynyl-3-bromothiophenes. Highly Efficient Synthesis of Benzothieno[3,2-b]quinolines and Thieno[3,2-b]pyrroles
作者:Ghazwan Ali Salman、Munawar Hussain、Viktor Iaroshenko、Alexander Villinger、Peter Langer
DOI:10.1002/adsc.201000709
日期:2011.2.11
palladium-catalyzed reaction of 2-alkynyl-3-bromothiophenes with anilines afforded thienopyrroles by a domino CN coupling/hydroamination process, the reaction of 2-alkynyl-3-bromobenzothiophenes with anilines resulted, under identical conditions, in the formation of benzothienoquinolines by a domino CN coupling/annulation process. The electronic character of the aniline also has an influence on the product distribution
Pd-Catalyzed Cascade Crossover Annulation of <i>o</i>-Alkynylarylhalides and Diarylacetylenes Leading to Dibenzo[<i>a</i>,<i>e</i>]pentalenes
作者:Jian Zhao、Kazuaki Oniwa、Naoki Asao、Yoshinori Yamamoto、Tienan Jin
DOI:10.1021/ja403382d
日期:2013.7.17
A novel and selective Pd-catalyzed cascade crossover-annulation of o-alkynylarylhalides and diarylacetylenes for the synthesis of dibenzo[a,e]pentalenes has been reported. Various arylacetylenes with a wide range of functional groups were tolerated, producing the corresponding multisubstituted dibenzopentalenes with the different substituents on the aromatic rings in good to high yields under the optimized reaction conditions. The reaction proceeds through a Pd-catalyzed cascade carbopalladation and C-H activation. The use of the combined DBU and CsOPiv bases is crucial for the successful implementation of the present cross-annulation.
Serendipitous discovery of Pd-catalyzed intramolecular cyclization of ortho-bromo(hetero)aryl-substituted (hetero)aryl-1,2-diketones: Applications in the synthesis of carba- and heterocyclic benzoin derivatives
heterocyclic benzoin derivatives were prepared by Sonogashiracoupling of alkynes with 1,2-dihaloalkenes and subsequent oxidation of the alkyne to a 1,2-diketone. The Pd-catalyzed reaction of the product with (2-bromophenyl)boronic acid in the presence of phenylacetylene resulted in formation of cyclic benzoin derivatives by Suzuki-Miyaura reaction and subsequent Pdcatalyzed nucleophilic addition