A highly efficient cobalt-catalyzed deuterogenolysis of diboron: Synthesis of deuterated pinacolborane and vinylboronates
摘要:
Highly efficient hydrogenolysis and deuterogenolysis of diboron compounds have been realized by the use of a cobalt catalyst, affording TON up to 48201. Furthermore, a one-pot two-step procedure comprising sequential deuterogenolysis of diboron and deuteroboration of alkynes under the same cobalt catalyst has been developed for the efficient, atom-economical synthesis of deuterated vinylboronates with high deuterium incorporation and excellent regio- and stereoselectivity. (C) 2019 Elsevier Ltd. All rights reserved.
Base-free nickel-catalyzed hydroboration of simple alkenes with bis(pinacolato)diboron in an alcoholic solvent
作者:Jiang-Fei Li、Zhen-Zhong Wei、Yong-Qiu Wang、Mengchun Ye
DOI:10.1039/c7gc02282d
日期:——
A base-free nickel-catalyzed hydroboration of unreactive simple alkenes with bis(pinacolato)diboron using methanol as the hydride source under mild conditions has been developed.
Unlocking the catalytic potential of tris(3,4,5-trifluorophenyl)borane with microwave irradiation
作者:Jamie L. Carden、Lukas J. Gierlichs、Duncan F. Wass、Duncan L. Browne、Rebecca L. Melen
DOI:10.1039/c8cc09459d
日期:——
The catalytic activity of tris(3,4,5-trifluorophenyl)borane has been explored in the 1,2-hydroboration reactions of unsaturated substrates. Under conventional conditions, the borane was found to be active only in the hydroboration of aldehyde, ketone and imine substrates, with alkenes and alkynes not being reduced effectively. The use of microwave irradiation on the other hand has permitted alkenes
Transition-metal-free regioselective synthesis of alkylboronates from arylacetylenes and vinyl arenes
作者:Kai Yang、Qiuling Song
DOI:10.1039/c5gc02633d
日期:——
A transition-metal-free synthesis of alkylboronates from arylacetylenes or vinyl arenes and B2pin2via tandem borylation and protodeboronation has been developed. This reaction features with excellent regioselectivities, broad functional group tolerance and good yields in both small and gram scale.
Beneficial Effect of a Secondary Ligand on the Catalytic Difunctionalization of Vinyl Arenes with Boron and CO
<sub>2</sub>
作者:Trina M. Perrone、Amy S. Gregory、Steven W. Knowlden、Natalie R. Ziemer、Rabah N. Alsulami、Jeffrey L. Petersen、Brian V. Popp
DOI:10.1002/cctc.201901197
日期:2019.12.5
superstoichiometric addition of vinyl arene or addition of secondary phosphine ligand. Reactivity optimization and competition experiments have provided preliminary insights into the ability of PPh3 to aid in the catalytic cycle, specifically carboxylation of electron‐rich benzyl‐copper(I) intermediate. Additional competition studies revealed that a catalytic amount of an electron‐rich vinyl arene could be used
Organoboron compounds are powerful precursors of value-added organic compounds in synthetic chemistry, and transition metal-catalysed borylation has always been dominant. To avoid toxic reagents and costs associated with metal catalysts, simpler, more economical and effective approaches for delivering organoborons are highly desirable. Here, without the use of any metal catalysts, a CH3CN-involved