Borderline metal catalysts, Bi(OTf)3 and Fe(OTf)3, were proven to work as dual activators for alkynes and N,O-acetals via σ,π-chelation, which achieved a new carboarylation reaction of alkynylarenes with N,O-acetals.
Synthesis of Benzofused <i>O</i>- and <i>N</i>-Heterocycles through Cascade Carbopalladation/Cross-Alkylation of Alkynes Involving the C–C Cleavage of Cyclobutanols
intramolecular carbopalladation of tethered alkynes with an alkylation step produced by the C–C cleavage of cyclobutanol derivatives. An alkenyl-Pd(II) intermediate has been isolated and characterized by X-ray diffraction studies. Interestingly, the nature of the tethering alkynyl chain influences the E/Z stereochemistry of the alkenyl fragment in the functionalized heterocycles.
我们报告了 Pd 催化的带有四取代烯烃片段的杂环的路线。我们的方法将束缚炔烃的分子内碳钯化与环丁醇衍生物的 C-C 裂解产生的烷基化步骤相结合。已分离出一种烯基-Pd(II) 中间体,并通过 X 射线衍射研究对其进行了表征。有趣的是,束缚炔基链的性质会影响官能化杂环中烯基片段的E / Z立体化学。
Alkyne Insertion Enabled Vinyl to Acyl 1,5‐Palladium Migration: Rapid Access to Substituted 5‐Membered‐Dihydrobenzofurans and Indolines
We herein report a novel 1,5-palladium/hydrogen shift pattern between a vinyl and an acyl group, which provides a divergent access to substituted 5-membered-dihydrobenzofurans and indolines. Further studies unveiled a novel relayed decarbonylative Catellani-type reaction. Mechanistic investigations including DFT calculations have shed light on the reaction pathway.
Palladium-Catalyzed Cyclization Coupling with Cyclobutanone-Derived <i>N</i>-Tosylhydrazones: Synthesis of Benzofuran-3-Cyclobutylidenes and Spirocyclobutanes
作者:Jie Sun、Hao Ye、Haibin Zhang、Xin-Xing Wu
DOI:10.1021/acs.joc.2c02620
日期:2023.2.3
Synergistic Steric Effects in the Development of a Palladium‐Catalyzed Alkyne Carbohalogenation: Stereodivergent Synthesis of Vinyl Halides
作者:Christine M. Le、Perry J. C. Menzies、David A. Petrone、Mark Lautens
DOI:10.1002/anie.201409248
日期:2015.1.2
our finding that by exploiting the synergisticstericeffects between substrate and catalyst, an intramolecular Pd‐catalyzedalkynecarbohalogenation can be achieved. This operationally simple method uses the bulky Pd/Q‐Phos combination and allows access to tetrasubstituted vinylhalides from the corresponding aryl chlorides, bromides, and iodides. Stericeffects in the substrate play a key role by