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。
A Gold(I) Complex with a 1,1′-Binaphthyl-Substituted Diphosphene: Synthesis, Structure, and Catalytic Application to Intramolecular Hydroarylation Reactions
作者:Akihiro Tsurusaki、Rikako Ura、Ken Kamikawa
DOI:10.1021/acs.organomet.9b00665
日期:2020.1.13
A gold(I) complex with a 1,1′-binaphthyl-substituted diphosphene was synthesized and fully characterized. A phosphorus atom with a less-hindered binaphthyl group coordinates to a gold(I) moiety in an η1 fashion. Both experiment and theoretical calculations supported the facile rotation around the C(Naph)–P bond in neutral and cationic diphosphene–gold(I) complexes. The newly obtained complex 2 was