Palladium-Catalyzed sp3 C–H Nitration of 8-Methylquinolines
摘要:
Palladium-Catalyzed nitration of 8-methylquinolines with t-BuONO to give 8-(nitromethyl)quinolines in moderate to excellent yields has been developed involving an sp(3) C-H bond activation. The resulting (nitromethyl)quinolines could be Selectively reduced to (1,2,3,4-tetrahydroquinolin-8-yl)-methanamines by NaBH4 in the presence of a catalytic amount of NiCl2 center dot 6H(2)O.
Pd-Catalyzed C–H Fluorination with Nucleophilic Fluoride
摘要:
The palladium-catalyzed C-H fluorination of 8-methylquinoline derivatives with nucleophilic fluoride is reported. This transformation involves the use of AgF as the fluoride source in combination with a hypervalent iodine oxidant. Both the scope and mechanism of the reaction are discussed.
Rh(<scp>iii</scp>)-Catalyzed straightforward arylation of 8-methyl/formylquinolines using diazo compounds
作者:Bidhan Ghosh、Rajarshi Samanta
DOI:10.1039/c9cc02391g
日期:——
A straightforward Rh(III)-catalyzed general strategy was developed for the introduction of naphthol/phenol moieties to the C(sp3)–H bond of 8-methylquinoline using diazonaphthalen-2(1H)-ones/quinone diazides. The developed method was further extended towards the arylation of 8-formylquinolines to accomplish diarylketone derivatives. The method is simple, relatively rapid, and chemo and regioselective
Anthranil: An Aminating Reagent Leading to Bifunctionality for Both C(sp<sup>3</sup>)−H and C(sp<sup>2</sup>)−H under Rhodium(III) Catalysis
作者:Songjie Yu、Guodong Tang、Yingzi Li、Xukai Zhou、Yu Lan、Xingwei Li
DOI:10.1002/anie.201602224
日期:2016.7.18
nitrogenation suffered from simple amidation/amination with limited atom‐economy and is mostly limited to C(sp2)−H substrates. In this work, anthranil was designed as a novel bifunctional aminating reagent for both C(sp2)−H and C(sp3)−H bonds under rhodium(III) catalysis, thus affording a nucleophilic aniline tethered to an electrophilic carbonyl. A tridendate rhodium(III) complex has been isolated as the
Cp*Co(III)-Catalyzed C(sp<sup>3</sup>)–H Bond Activation: A Highly Stereoselective and Regioselective Alkenylation of 8-Methylquinoline with Alkynes
作者:Malay Sen、Balakumar Emayavaramban、Nagaraju Barsu、J. Richard Premkumar、Basker Sundararaju
DOI:10.1021/acscatal.6b00612
日期:2016.5.6
Efficient, atom-economical, highly regioselective C(sp3)–H bond alkenylation of 8-methylquinoline catalyzed by (Cp*)Co(III) is reported. A well-defined, air-stable, molecular cobalt catalyst, Cp*Co(III), is employed for the first time in C(sp3)–H bond activation. The developed methodology is broadly applicable and tolerates a variety of functional groups, under mild conditions. Experimental and density
Disclosed herein is a Pd(II)-catalyzedC(sp3)–H/P–H oxidative cross-coupling reaction between 8-methylquinolines with H-phosphonates or diarylphosphine oxides via chelation-assisted C(sp3)–H bond activation. The protocol exhibits a relatively broad functional-group tolerance and exclusive chemo- and regioselectivity. Furthermore, detailed mechanistic studies support the proposed reaction pathway.
Rhodium(<scp>iii</scp>)-catalyzed regio- and stereoselective benzylic α-fluoroalkenylation with gem-difluorostyrenes
作者:Lingheng Kong、Bingxian Liu、Xukai Zhou、Fen Wang、Xingwei Li
DOI:10.1039/c7cc06048c
日期:——
Rhodium(III)-catalyzed mild benzylic α-fluoroalkenylation of 8-methylquinolines with gem-difluorostyrenes has been developed. This reaction occurred via C–H activation and C–F cleavage and is applicable to a wide range of substrates, leading to the synthesis of Z-alkenyl fluorides under mild and redox-neutral conditions with high regio- and stereoselectivity.