Mild Cobalt-Catalyzed Negishi Cross-Couplings of (Hetero)arylzinc Reagents with (Hetero)aryl Halides
作者:Diana Haas、Jeffrey M. Hammann、Ferdinand H. Lutter、Paul Knochel
DOI:10.1002/anie.201510665
日期:2016.3.7
CoCl2⋅2 LiCl (5 mol %) and HCO2Na (50 mol %) enables the cross‐coupling of various N‐heterocyclic chlorides and bromides as well as aromatic halogenated ketones with various electron‐rich and ‐poor arylzincreagents. The reactions reached full conversion within a few hours at 25 °C.
Ni-Catalyzed Synthesis of Thiocarboxylic Acid Derivatives
作者:John J. Monteith、Katerina Scotchburn、L. Reginald Mills、Sophie A. L. Rousseaux
DOI:10.1021/acs.orglett.1c04074
日期:2022.1.21
cross-coupling of readily accessible O-alkyl xanthate esters or thiocarbonyl imidazolides and organozinc reagents for the synthesis of thiocarboxylic acidderivatives has been developed. This method benefits from a fast reaction time, mild reaction conditions, and ease of starting material synthesis. The use of transition-metal catalysis to access a diverse range of thiocarbonyl-containing compounds provides
Enantioselective rhodium-catalysed 1,4-additions of 2-heteroarylzinc donors using Me-DUPHOS
作者:Jérôme Le Nôtre、Joseph C. Allen、Christopher G. Frost
DOI:10.1039/b806098c
日期:——
The enantioselective 1,4-addition of 2-(substituted)thienylzinc and 2-furanylzinc reagents has been achieved (up to 99 : 1 er) using a complex derived from [Rh(C2H4)2Cl]2 and Me-DUPHOS.
New B-substituted derivatives of m-carborane, p-carborane, and cobalt bis(1,2-dicarbollide) anion
作者:Irina P. Beletskaya、Vladimir I. Bregadze、Vasily A. Ivushkin、Pavel V. Petrovskii、Igor B. Sivaev、Stefan Sjöberg、Galina G. Zhigareva
DOI:10.1016/j.jorganchem.2004.05.047
日期:2004.9
The Pd-catalyzed cross-coupling reactions of B–I bond in m- and p-carboranes and cobalt bis(1,2-dicarbollide) anion with organomagnesium and organozinc compounds were studied. Carboranyl derivatives of furan, thiophene, indole, pyridine and quinoline were synthesized. 2-Pyridylethynyl and 3-quinolylethynyl derivatives of p-carborane were prepared by Pd-catalyzed cross-coupling reactions using corresponding
Rhodium-Catalyzed Three-Component Reaction of Alkynes, Arylzinc Chlorides, and Iodomethanes Producing Trisubstituted/Tetrasubstituted Alkenes with/without 1,4-Migration
作者:He Meng、Shiming Bai、Yu Qiao、Ting He、Weiyi Li、Jialin Ming
DOI:10.1021/acs.orglett.2c02299
日期:2022.7.29
A three-component reaction of alkynes, arylzinc chlorides, and iodomethanes was found to proceed in the presence of a rhodium catalyst to give high yields of trisubstituted/tetrasubstituted alkenes. The usual arylzinc chlorides only gave trisubstitutedalkenes, generated through a migratory carbozincation–cross-coupling sequence, where 1,4-Rh migration from an alkenyl carbon to an aryl carbon occurred