γ-Selective C(sp3)–H amination via controlled migratory hydroamination DOI Creative Commons
Changseok Lee, Huiyeong Seo, Jinwon Jeon

et al.

Nature Communications, Journal Year: 2021, Volume and Issue: 12(1)

Published: Sept. 27, 2021

Abstract Remote functionalization of alkenes via chain walking has generally been limited to C(sp 3 )–H bonds α and β polar-functional units, while γ -C(sp through controlled alkene transposition is a longstanding challenge. Herein, we describe NiH-catalyzed migratory formal hydroamination alkenyl amides achieved chelation-assisted control, whereby various amino groups are installed at the -position aliphatic chains. By tuning olefin isomerization ligand directing group optimization, -selective amination can be stabilization 6-membered nickellacycle by an 8-aminoquinoline subsequent interception aminating reagent. A range amines bond unactivated with varying alkyl lengths, enabling late-stage access value-added -aminated products. Moreover, employing picolinamide-coupled substrates, this approach further extended δ amination. The chain-walking mechanism pathway selectivity investigated experimental computational methods.

Language: Английский

Site-Selective Ni-Catalyzed Reductive Coupling of α-Haloboranes with Unactivated Olefins DOI
Shang‐Zheng Sun, Marino Börjesson,

Raúl Martín‐Montero

et al.

Journal of the American Chemical Society, Journal Year: 2018, Volume and Issue: 140(40), P. 12765 - 12769

Published: Sept. 23, 2018

A mild, chemo- and site-selective catalytic protocol that allows for incorporating an alkylboron fragment into unactivated olefins is described. The use of internal enables C–C bond-formation at remote sp3 C–H sites, constituting a complementary conceptually different approach to existing borylation techniques are currently available centers.

Language: Английский

Citations

233

Nickel-catalyzed difunctionalization of allyl moieties using organoboronic acids and halides with divergent regioselectivities DOI Creative Commons
Wanfang Li,

Jie Kang Boon,

Yu Zhao

et al.

Chemical Science, Journal Year: 2017, Volume and Issue: 9(3), P. 600 - 607

Published: Oct. 26, 2017

We present herein a nickel-catalyzed dicarbofunctionalization of alkenes using readily available organoboronic acids and organic halides in three-component fashion.

Language: Английский

Citations

222

Electroreductive Carbofunctionalization of Alkenes with Alkyl Bromides via a Radical-Polar Crossover Mechanism DOI
Wen Zhang, Song Lin

Journal of the American Chemical Society, Journal Year: 2020, Volume and Issue: 142(49), P. 20661 - 20670

Published: Nov. 24, 2020

Electrochemistry grants direct access to reactive intermediates (radicals and ions) in a controlled fashion toward selective organic transformations. This feature has been demonstrated variety of alkene functionalization reactions, most which proceed via an anodic oxidation pathway. In this report, we further expand the scope electrochemistry reductive alkenes. particular, strategic choice reagents reaction conditions enabled radical-polar crossover pathway wherein two distinct electrophiles can be added across highly chemo- regioselective fashion. Specifically, used strategy intermolecular carboformylation, anti-Markovnikov hydroalkylation, carbocarboxylation alkenes—reactions with rare precedents literature—by means electroreductive generation alkyl radical carbanion intermediates. These reactions employ readily available starting materials (alkyl halides, alkenes, etc.) simple, transition-metal-free display broad substrate good tolerance functional groups. A uniform protocol achieve all three transformations by simply altering medium. development provides new avenue for constructing Csp3–Csp3 bonds.

Language: Английский

Citations

216

Catalytic Intermolecular Carboamination of Unactivated Alkenes via Directed Aminopalladation DOI
Zhen Liu, Yanyan Wang, Zichen Wang

et al.

Journal of the American Chemical Society, Journal Year: 2017, Volume and Issue: 139(32), P. 11261 - 11270

Published: July 20, 2017

An intermolecular 1,2-carboamination of unactivated alkenes proceeding via a Pd(II)/Pd(IV) catalytic cycle has been developed. To realize this transformation, cleavable bidentate directing group is used to control the regioselectivity aminopalladation and stabilize resulting organopalladium(II) intermediate, such that oxidative addition carbon electrophile outcompetes potential β-hydride elimination. Under optimized reaction conditions, broad range nitrogen nucleophiles electrophiles are compatible coupling partners in reaction, affording moderate high yields. The products can be easily converted free γ-amino acids γ-lactams, both which common structural motifs found drug molecules bioactive compounds. Reaction kinetics DFT calculations shed light on mechanism explain empirically observed reactivity trends.

Language: Английский

Citations

210

Nickel-Catalyzed Enantioconvergent Reductive Hydroalkylation of Olefins with α-Heteroatom Phosphorus or Sulfur Alkyl Electrophiles DOI

Shi-Jiang He,

Jia‐Wang Wang, Yan Li

et al.

Journal of the American Chemical Society, Journal Year: 2019, Volume and Issue: 142(1), P. 214 - 221

Published: Dec. 15, 2019

Substantial advances in enantioconvergent C(sp3)–C(sp3) bond formation reactions have been made recent years through the use of transition-metal-catalyzed cross-coupling racemic secondary alkyl electrophiles with organometallic reagents. Herein, we report a general process for asymmetric construction alkyl–alkyl bonds adjacent to heteroatoms, namely, nickel-catalyzed reductive hydroalkylation olefins α-heteroatom phosphorus or sulfur electrophiles. Including readily available olefins, this reaction has considerable advantages, such as mild conditions, broad substrate scope, and good functional group compatibility, making it desirable alternative traditional electrophile–nucleophile reactions.

Language: Английский

Citations

169

Palladium-Catalyzed Amide-Directed Enantioselective Hydrocarbofunctionalization of Unactivated Alkenes Using a Chiral Monodentate Oxazoline Ligand DOI
Hao Wang, Zibo Bai,

Tang-Qian Jiao

et al.

Journal of the American Chemical Society, Journal Year: 2018, Volume and Issue: 140(10), P. 3542 - 3546

Published: Feb. 23, 2018

A Pd-catalyzed amide-directed enantioselective hydrocarbofunctionalization of unactivated alkenes with C–H nucleophiles has been developed using a chiral monodentate oxazoline (MOXin) ligand. Various indoles react at C3 position aminoquinoline-coupled 3-alkenamides to give γ addition products in good excellent yield and enantioselectivity. This study represents an important advance the development ligands, which have underexplored for asymmetric catalysis.

Language: Английский

Citations

166

Recent advances in nickel-catalyzed reductive hydroalkylation and hydroarylation of electronically unbiased alkenes DOI
Xiaoxu Wang, Xi Lu, Yan Li

et al.

Science China Chemistry, Journal Year: 2020, Volume and Issue: 63(11), P. 1586 - 1600

Published: Sept. 28, 2020

Language: Английский

Citations

154

Transition-metal-catalyzed C–H bond alkylation using olefins: recent advances and mechanistic aspects DOI
Debasish Mandal,

Sumali Roychowdhury,

Jyoti Prasad Biswas

et al.

Chemical Society Reviews, Journal Year: 2022, Volume and Issue: 51(17), P. 7358 - 7426

Published: Jan. 1, 2022

Transition metal catalysis has contributed immensely to C-C bond formation reactions over the last few decades, and alkylation is no exception. The superiority of such methodologies traditional evident from minimal reaction steps, shorter times, atom economy while also allowing control regio- stereo-selectivity. In particular, hydrocarbonation alkenes grabbed increased attention due its fundamental ability effectively selectively synthesise a wide range industrially pharmaceutically relevant moieties. This review attempts provide scientific viewpoint systematic analysis recent developments in transition-metal-catalyzed various C-H bonds using simple activated olefins. key features mechanistic studies involved these transformations are described briefly.

Language: Английский

Citations

83

β,γ-Vicinal Dicarbofunctionalization of Alkenyl Carbonyl Compounds via Directed Nucleopalladation DOI
Zhen Liu, Tian Zeng,

Kin S. Yang

et al.

Journal of the American Chemical Society, Journal Year: 2016, Volume and Issue: 138(46), P. 15122 - 15125

Published: Oct. 25, 2016

A palladium(II)-catalyzed 1,2-dicarbofunctionalization reaction of unactivated alkenes has been developed, wherein a cleavable bidentate directing group is used to control the regioselectivity and stabilize putative alkylpalladium(II) intermediate. Under optimized conditions, broad range nucleophiles electrophiles were found participate in this transformation, providing moderate high yields. 3-Butenoic acid derivatives containing internal α-substituents reactive substrates, offering powerful platform for preparing β,γ-substituted carbonyl compounds with multiple stereocenters.

Language: Английский

Citations

167

C(alkenyl)–H Activation via Six-Membered Palladacycles: Catalytic 1,3-Diene Synthesis DOI
Mingyu Liu, Pusu Yang, Malkanthi K. Karunananda

et al.

Journal of the American Chemical Society, Journal Year: 2018, Volume and Issue: 140(17), P. 5805 - 5813

Published: April 9, 2018

A catalytic method to prepare highly substituted 1,3-dienes from two different alkenes is described using a directed, palladium(II)-mediated C(alkenyl)–H activation strategy. The transformation exhibits broad scope across three synthetically useful substrate classes masked with suitable bidentate auxiliaries (4-pentenoic acids, allylic alcohols, and bishomoallylic amines) tolerates internal nonconjugated alkenes, which have traditionally been challenging class of substrates in this type chemistry. Catalytic turnover enabled by either MnO2 as the stoichiometric oxidant or co-catalytic Co(OAc)2 O2 (1 atm). Experimental computational studies were performed elucidate preference for over other potential pathways. As part effort, structurally unique alkenylpalladium(II) dimer was isolated characterized.

Language: Английский

Citations

144