Radical Hydroboration and Hydrosilylation of gem-Difluoroalkenes: Synthesis of α-Difluorinated Alkylborons and Alkylsilanes DOI
Xiaozu Liu, E. Lin, Guojun Chen

et al.

Organic Letters, Journal Year: 2019, Volume and Issue: 21(20), P. 8454 - 8458

Published: Oct. 10, 2019

A first example of radical hydroboration and hydrosilylation gem-difluoroalkenes using ABIN as the initiator is described. This protocol features good functional group tolerance, operational simplicity, high atom economy, easy scale-up, enabling efficient assembly a wide range α-difluorinated alkylborons alkylsilanes in moderate to excellent yields. The synthetic utility these products demonstrated by further transformation C–B bond C–Si into valuable CF2-containing molecules.

Language: Английский

Radical philicity and its role in selective organic transformations DOI

Faeze Parsaee,

Milinda C. Senarathna, Prashansa B. Kannangara

et al.

Nature Reviews Chemistry, Journal Year: 2021, Volume and Issue: 5(7), P. 486 - 499

Published: June 22, 2021

Language: Английский

Citations

288

Photoinduced Borylation for the Synthesis of Organoboron Compounds DOI
Ya‐Ming Tian, Xiaoning Guo, Holger Braunschweig

et al.

Chemical Reviews, Journal Year: 2021, Volume and Issue: 121(7), P. 3561 - 3597

Published: Feb. 17, 2021

Organoboron compounds have important synthetic value and can be applied in numerous transformations. The development of practical convenient ways to synthesize boronate esters has thus attracted significant interest. Photoinduced borylations originated from stoichiometric reactions alkanes arenes with well-defined metal–boryl complexes. Now, photoredox-initiated borylations, catalyzed by either transition metal or organic photocatalysts, photochemical high efficiency become a burgeoning area research. In this Focus Review, we summarize research on photoinduced especially emphasizing recent developments trends. This includes the borylation arenes, alkanes, aryl/alkyl halides, activated carboxylic acids, amines, alcohols, so based catalysis, metal-free organocatalysis, direct activation. We focus reaction mechanisms involving single-electron transfer, triplet-energy other radical processes.

Language: Английский

Citations

261

First-Row d-Block Element-Catalyzed Carbon–Boron Bond Formation and Related Processes DOI
Shubhankar Kumar Bose, Lujia Mao,

Laura Kuehn

et al.

Chemical Reviews, Journal Year: 2021, Volume and Issue: 121(21), P. 13238 - 13341

Published: Oct. 7, 2021

Organoboron reagents represent a unique class of compounds because their utility in modern synthetic organic chemistry, often affording unprecedented reactivity. The transformation the carbon–boron bond into carbon–X (X = C, N, and O) stereocontrolled fashion has become invaluable medicinal agrochemistry, natural products chemistry as well materials science. Over past decade, first-row d-block transition metals have increasingly widely used catalysts for formation bond, traditionally catalyzed by expensive precious metals. This recent focus on alternative enabled growth fundamental methods organoboron chemistry. review surveys current state-of-the-art use element-based bonds.

Language: Английский

Citations

245

Sequential C–F bond functionalizations of trifluoroacetamides and acetates via spin-center shifts DOI Open Access

You‐Jie Yu,

Feng‐Lian Zhang,

Tianyu Peng

et al.

Science, Journal Year: 2021, Volume and Issue: 371(6535), P. 1232 - 1240

Published: March 5, 2021

Defluorinative functionalization of readily accessible trifluoromethyl groups constitutes an economical route to partially fluorinated molecules. However, the controllable replacement one or two fluorine atoms while maintaining high chemoselectivity remains a formidable challenge. Here we describe general strategy for sequential carbon-fluorine (C-F) bond functionalizations trifluoroacetamides and trifluoroacetates. The reaction begins with activation carbonyl oxygen atom by 4-dimethylaminopyridine-boryl radical, followed spin-center shift trigger C-F scission. A chemoselectivity-controllable two-stage process enables generation difluoro- monofluoroalkyl radicals, which are selectively functionalized different radical traps afford diverse products. mechanism origin were established experimental computational approaches.

Language: Английский

Citations

241

A radical approach for the selective C–H borylation of azines DOI

Ji Hye Kim,

Timothée Constantin, Marco Simonetti

et al.

Nature, Journal Year: 2021, Volume and Issue: 595(7869), P. 677 - 683

Published: May 20, 2021

Language: Английский

Citations

137

Advances in chemistry of N-heterocyclic carbene boryl radicals DOI
Tsuyoshi Taniguchi

Chemical Society Reviews, Journal Year: 2021, Volume and Issue: 50(16), P. 8995 - 9021

Published: Jan. 1, 2021

This review focuses on synthesis and reactions of boryl radicals ligated by N-heterocyclic carbenes.

Language: Английский

Citations

123

New Radical Borylation Pathways for Organoboron Synthesis Enabled by Photoredox Catalysis DOI
Jing Qi, Feng‐Lian Zhang, Ji‐Kang Jin

et al.

Angewandte Chemie International Edition, Journal Year: 2020, Volume and Issue: 59(31), P. 12876 - 12884

Published: March 31, 2020

Radical borylation using N-heterocyclic carbene (NHC)-BH3 complexes as boryl radical precursors has emerged an important synthetic tool for organoboron assembly. However, the majority of reported methods are limited to reaction modes involving carbo- and/or hydroboration specific alkenes and alkynes. Moreover, generation NHC-boryl radicals relies principally on hydrogen atom abstraction with aid initiators. A distinct method is reported, well pathways enabled by photoredox catalysis. generated via a single-electron oxidation subsequently undergo cross-coupling in-situ-generated anions yield gem-difluoroallylboronates. photoredox-catalyzed arylboration was achieved cyanoarenes arylating components from which elaborated organoborons were accessed. Mechanistic studies verified oxidative formation through single-electron-transfer pathway.

Language: Английский

Citations

121

Hydroalkylation of Unactivated Olefins via Visible-Light-Driven Dual Hydrogen Atom Transfer Catalysis DOI

Guangyue Lei,

Meichen Xu,

Rui Chang

et al.

Journal of the American Chemical Society, Journal Year: 2021, Volume and Issue: 143(29), P. 11251 - 11261

Published: July 16, 2021

Radical hydroalkylation of olefins enabled by hydrogen atom transfer (HAT) catalysis represents a straightforward means to access C(sp3)-rich molecules from abundant feedstock chemicals without the need for prefunctionalization. While Giese-type activated initiated HAT hydridic carbon-hydrogen bonds is well-precedented, unactivated in similar fashion remains elusive, primarily owing lack general methods overcome inherent polarity-mismatch this scenario. Here, we report use visible-light-driven dual achieve goal, where catalytic amounts an amine-borane and situ generated thiol were utilized as abstractor donor, respectively. The reaction completely atom-economical exhibits broad scope. Experimental computational studies support proposed mechanism suggest that hydrogen-bonding between substrates beneficial improving efficiency.

Language: Английский

Citations

95

Copper‐Photocatalyzed Hydroboration of Alkynes and Alkenes DOI Creative Commons
Mingbing Zhong,

Yohann Gagné,

Taylor O. Hope

et al.

Angewandte Chemie International Edition, Journal Year: 2021, Volume and Issue: 60(26), P. 14498 - 14503

Published: March 29, 2021

The photocatalytic hydroboration of alkenes and alkynes is reported. use newly-designed copper photocatalysts with B

Language: Английский

Citations

82

Boryl Radical Activation of Benzylic C–OH Bond: Cross-Electrophile Coupling of Free Alcohols and CO2 via Photoredox Catalysis DOI
Wen‐Duo Li, Yang Wu, Shijun Li

et al.

Journal of the American Chemical Society, Journal Year: 2022, Volume and Issue: 144(19), P. 8551 - 8559

Published: April 4, 2022

A new strategy for the direct cleavage of C(sp3)-OH bond has been developed via activation free alcohols with neutral diphenyl boryl radical generated from sodium tetraphenylborate under mild visible light photoredox conditions. This verified by cross-electrophile coupling and carbon dioxide synthesis carboxylic acids. Direct transformation a range primary, secondary, tertiary benzyl to acids achieved. Control experiments computational studies indicate that undergoes homolysis bond, generating alkyl radicals. After reducing into anion conditions, following carboxylation CO2 affords product.

Language: Английский

Citations

70