Pd/P(<i>t</i>-Bu)<sub>3</sub>: A Mild and General Catalyst for Stille Reactions of Aryl Chlorides and Aryl Bromides
作者:Adam F. Littke、Lothar Schwarz、Gregory C. Fu
DOI:10.1021/ja020012f
日期:2002.6.1
catalyst for Stille reactions of arylchlorides and bromides, providing solutions to a number of long-standing challenges. An unprecedented array of arylchlorides can be cross-coupled with a range of organotin reagents, including SnBu(4). Very hindered biaryls (e.g., tetra-ortho-substituted) can be synthesized, and arylchlorides can be coupled in the presence of aryl triflates. The method is user-friendly
Versatile Catalysts for the Suzuki Cross-Coupling of Arylboronic Acids with Aryl and Vinyl Halides and Triflates under Mild Conditions
作者:Adam F. Littke、Chaoyang Dai、Gregory C. Fu
DOI:10.1021/ja0002058
日期:2000.5.1
Through the use of Pd-2(dba)(3)/P(t-Bu)(3) as a catalyst, a wide range of aryl and vinyl halides, including chlorides, undergo Suzuki cross-coupling with arylboronic acids in very good yield, typically at room temperature; through use of Pd(OAc)(2)/PCy3, a diverse array of aryl and vinyl triflates react cleanly at room temperature. Together, these two catalyst systems cover a broad spectrum of commonly encountered substrates for Suzuki couplings. Furthermore, they display novel reactivity patterns, such as the selective cross-coupling by Pd-2(dba)(3)/P(t-Bu)(3) of an aryl chloride in preference to an aryl triflate, and they can be used at low lending, even for reactions of aryl chlorides. Preliminary mechanistic work indicates that a palladium monophosphine complex is the active catalyst in the cross-coupling of aryl halides.
Dual Intermolecular Allylic C-H Functionalization of the Tetrasubstituted Alkene Scaffold
作者:Claudio Martínez、Kilian Muñiz
DOI:10.1002/ejoc.201701624
日期:2018.3.14
Simple activation of chloramine‐T by a Brønsted acid generates N‐chlorotosylamide, which serves as a reagent for the selective double C–H functionalization at the allylic position of tetrasubstituted alkenes.