Chromatography-Free and Eco-Friendly Synthesis of Aryl Tosylates and Mesylates
摘要:
Two chromatography-free and eco-friendly protocols have been developed to synthesize aryl tosylates and mesylates by the tosylation and mesylation of the corresponding hydroxyarenes, respectively. These protocols are superior to other known ones regarding the simplicity, reaction time and conditions, the range of substrates, yields, and environmental friendliness.
A nickel precatalyst for efficient cross-coupling reactions of aryl tosylates with arylboronic acids: vital role of dppf
作者:Feng Hu、Xiangyang Lei
DOI:10.1016/j.tet.2014.04.059
日期:2014.6
An air-stable and easy-to-handle nickelprecatalyst, (9-phenanthrenyl)Ni(II)(PPh3)2Cl, was examined for the cross-couplingreactions of aryl tosylates with arylboronic acids. Under the optimized reaction conditions, the catalytic system tolerates a wide range of activated, neutral and deactivated substrates. The selectivity of this cross-couplingreaction towards aryl tosylates and arylboronic acids
Aryl tosylates are an attractive class of electrophiles for cross‐coupling reactions due to ease of synthesis, low price, and the employment of C−O electrophiles, however, the reactivity of aryl tosylates is low. Herein, we report the Ni‐catalyzed C(sp2)−C(sp3) Kumada cross‐coupling of aryl tosylates with primary and secondary alkyl Grignard reagents. The method delivers valuable alkyl arenes by cross‐coupling
Palladium-Catalyzed Phosphorylation of Aryl Mesylates and Tosylates
作者:Wai Chung Fu、Chau Ming So、Fuk Yee Kwong
DOI:10.1021/acs.orglett.5b03104
日期:2015.12.4
The first general palladium catalyst for the phosphorylation of arylmesylates and tosylates is reported. The newly developed system exhibits excellent functional group compatibility. For instance, free amino, keto, ester, and amido groups, as well as heterocycles, remain intact during the course of reaction. The mesylated derivatives of biologically active compounds such as 17β-estradiol and 6-hydroxyflavone
Palladium-Catalyzed <i>N</i>-Arylation of Sulfoximines with Aryl Sulfonates
作者:Qingjing Yang、Pui Ying Choy、Qingyang Zhao、Man Pan Leung、Hoi Shan Chan、Chau Ming So、Wing-Tak Wong、Fuk Yee Kwong
DOI:10.1021/acs.joc.8b01599
日期:2018.9.21
Palladium-catalyzed C–N bond coupling reaction between NH-sulfoximines and aryl halides (e.g., −Br, −I, and −Cl and pseudohalides −OTf and −ONf) was successfully achieved. Nevertheless, aryltosylates/mesylates left much to be achieved. In this report, a general N-arylation of sulfoximines with aryl sulfonates is described. Using Pd(OAc)2/MeO-CM-phos complex, the N-aryl sulfoximine products can be
A Cu(I) complex of bisamidine-type sp2N bidentate ligand, Naph-diPIM, catalyzes coupling between 1,3-dicarbonylcompounds and simple cyclic alkenes using (t-BuO)2, providing the corresponding C-all...