Herein we present a Bi-catalyzed cross-coupling of arylboronic acids with perfluoroalkyl sulfonate salts based on a Bi(III)/Bi(V) redox cycle. An electron-deficient sulfone ligand proved to be key for the successful implementation of this protocol, which allows the unusual construction of C(sp2)–O bonds using commercially available NaOTf and KONf as coupling partners. Preliminary mechanistic studies
作者:Kevin W. Anderson、Maria Mendez-Perez、Julian Priego、Stephen L. Buchwald
DOI:10.1021/jo034962a
日期:2003.12.1
detailed study of the palladium-catalyzedamination of aryl nonaflates is reported. Use of ligands 2-4 and 6 allows for the catalytic amination of electron-rich and -neutral aryl nonaflates with both primary and secondary amines. With use of Xantphos 5, the catalytic amination of a variety of functionalized aryl nonaflates resulted in excellent yields of anilines; even 2-carboxymethyl aryl nonaflate is effectively
Synthesis of (<i>Z</i>)-<i>N</i>-Alkenylazoles and Pyrroloisoquinolines from α-<i>N</i>-Azoleketones through Pd-Catalyzed Tosylhydrazone Cross-Couplings
作者:Lucía Florentino、Fernando Aznar、Carlos Valdés
DOI:10.1002/chem.201301057
日期:2013.8.5
Azoles reacting in tandem: The ortho‐stereodirecting effect is the key to the stereoselective synthesis of (Z)‐N‐alkenylazoles I through the tosylhydrazide‐mediated Pd‐catalyzed cross‐coupling reaction of α‐N‐azoleacetophenones with ortho‐substituted aryl halides and nonaflates (see scheme). Additionally, the preorganization of the alkene allowed for the development of an auto‐tandem reaction involving
are employed as electrophiles in the Pd-catalyzed cross-coupling with tosylhydrazones affording di-, tri-, and tetrasubstituted olefins. Fine tunning of the reaction conditions are required to accomplish the coupling successfully, including the addition of LiCl and the presence of small amounts of water. Under the optimized conditions, the reactions proceed with high yield and also high stereoselectivity
A palladium-catalyzed coupling reaction of aryl nonaflates, sulfur dioxide, and hydrazines
作者:Yuanyuan An、Hongguang Xia、Jie Wu
DOI:10.1039/c5ob02514a
日期:——
nonaflates, sulfurdioxide, and hydrazines is reported. This transformation proceeds in the presence of Pd(OAc)2/XantPhos, and TBAB in 1,4-dioxane at 80 °C, leading to the corresponding N-aminosulfonamides in moderate to good yields. The reaction scope has been demonstrated, and good functional tolerance is observed. A plausible mechanism is proposed through the insertion of sulfurdioxide.