Pd-Catalyzed Vinylation of Aryl Halides with Inexpensive Organosilicon Reagents Under Mild Conditions
作者:Chu-Ting Yang、Jun Han、Jun Liu、Yi Li、Fan Zhang、Hai-Zhu Yu、Sheng Hu、Xiaolin Wang
DOI:10.1002/chem.201802573
日期:2018.7.20
Pd‐catalyzed Hiyama vinylation reaction of non‐activated aryl chlorides and bromides under mild conditions was developed. The use of efficient vinyl donors and electron‐rich sterically hindered phosphine ligands was critical for the success of the reaction. The products of this transformation can be used for Am/Cm separation, an important challenge in nuclear fuel reprocessing. The substituent effect
1-Methyl-1-vinyl- and 1-Methyl-1-(prop-2-enyl)silacyclobutane: Reagents for Palladium-Catalyzed Cross-Coupling Reactions of Aryl Halides
作者:Scott E. Denmark、Zhigang Wang
DOI:10.1055/s-2000-6292
日期:——
1-Methyl-1-vinylsilacyclobutane (1) and 1-methyl-1-(prop-2-enyl)silacyclobutane (2) undergo rapid and high yielding cross-coupling with aromatic halides. Many different substituents and patterns on the aromatic moiety are tolerated. All reactions can be run at room temperature and require the presence of tetrabutylammonium fluoride and Pd(dba)2. Both silacyclobutanes can be made in one step from commercially available precursors.
Palladium−Phosphinous Acid-Catalyzed Cross-Coupling of Aryl and Acyl Halides with Aryl-, Alkyl-, and Vinylzinc Reagents
作者:Hanhui Xu、Kekeli Ekoue-Kovi、Christian Wolf
DOI:10.1021/jo801445y
日期:2008.10.3
biaryls in up to 92% yield. Arylhalides also undergo POPd7-catalyzed aryl-vinyl and aryl-alkyl bond formation under mild conditions. Styrenes and alkylarenes were prepared in 79-93% yield fromarylhalides and vinyl or alkylzinc reagents. The replacement of arylhalides by acyl halides provides access to ketones which were produced in up to 98% yield when POPd was used as catalyst. This approach overcomes
synthesis of 2‐vinylanilines from the reaction of arylhydrazine hydrochlorides with alkenes and diethyl ketone via a rhodium‐catalyzed CHactivation is described. The oxidant‐free olefination reaction involves the in situ generation of an NNCR1R2 moiety as the oxidizingdirecting group thus providing an easy access to 2‐vinylanilines.
Photocatalysed eosin Y mediated C(sp3)-H alkylation of amine substrates via direct HAT
作者:Vishal Srivastava、Pravin K. Singh、Praveen P. Singh
DOI:10.1016/j.tetlet.2019.04.016
日期:2019.5
catalysed, green one-pot approach for the alkylation of amine substrates with sp2 carbon has been developed. This eosin Y based organic transformations, can behave as an effective direct hydrogen-atomtransfer catalyst for coupling reaction. The proposed strategy includes simple procedure which can make adduct product with sp2 carbon. This eosin Y based photocatalytic hydrogen-atomtransfer strategy may hold