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Visible light-induced hydroxymethylation and formylation of (iso)quinolines with alcohols. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Colgan AC, Proctor RSJ, Gibson DC, Chuentragool P, Lahdenperä ASK, Ermanis K, Phipps RJ. Hydrogen Atom Transfer Driven Enantioselective Minisci Reaction of Alcohols. Angew Chem Int Ed Engl 2022; 61:e202200266. [PMID: 35420220 PMCID: PMC9321721 DOI: 10.1002/anie.202200266] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Indexed: 12/25/2022]
Abstract
Catalytic enantioselective Minisci reactions have recently been developed but all instances so far utilize α-amino radical coupling partners. We report a substantial evolution of the enantioselective Minisci reaction that enables α-hydroxy radicals to be used, providing valuable enantioenriched secondary alcohol products. This is achieved through the direct oxidative coupling of two C-H bonds on simple alcohol and pyridine partners through a hydrogen atom transfer (HAT)-driven approach: a challenging process to achieve due to the numerous side reactions that can occur. Our approach is highly regioselective as well as highly enantioselective. Dicumyl peroxide, upon irradiation with 390 nm light, serves as both HAT reagent and oxidant whilst selectivity is controlled by use of a chiral phosphoric acid catalyst. Computational and experimental evidence provide mechanistic insight as to the origin of selectivity, revealing a stereodetermining deprotonation step distinct from the analogous reaction of amide-containing substrates.
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Affiliation(s)
- Avene C Colgan
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Rupert S J Proctor
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - David C Gibson
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Padon Chuentragool
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Antti S K Lahdenperä
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Kristaps Ermanis
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.,School of Chemistry, University of Nottingham University Park, Nottingham, NG7 2RD, UK
| | - Robert J Phipps
- Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
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Colgan AC, Proctor RSJ, Gibson DC, Chuentragool P, Lahdenpera A, Ermanis K, Phipps RJ. Hydrogen Atom Transfer Driven Enantioselective Minisci Reaction of Alcohols. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202200266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Avene C. Colgan
- University of Cambridge Central Science Library: University of Cambridge Chemistry UNITED KINGDOM
| | | | | | | | - Antti Lahdenpera
- University of Cambridge Yusuf Hamied Department of Chemistry UNITED KINGDOM
| | | | - Robert J Phipps
- University of Cambridge Department of Chemistry Lensfield Road CB2 1EW Cambridge UNITED KINGDOM
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One-pot synthesis of heteroaromatic acetals via selectfluor-mediated tandem reaction of methyl quinoline-2-carboxylate and methanol. Tetrahedron 2022. [DOI: 10.1016/j.tet.2021.132607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
Minisci-type reactions have been widely known as reactions that involve the addition
of carbon-centered radicals to basic heteroarenes followed by formal hydrogen atom loss.
While the originally developed protocols for radical generation remain in active use today, in
recent years, the new array of radical generation strategies have allowed the use of a wider
variety of radical precursors that often operate under milder and more benign conditions. New
transformations based on free radical reactivity are now available to a synthetic chemist, to
utilize a Minisci-type reaction. Radical-generation methods based on photoredox catalysis
and electrochemistry, which utilize thermal cleavage or the in situ generation of reactive radical
precursors, have become popular approaches. Our review will cover the remarkable literature
that has been reported on this topic in recent 5 years, from 2015-01 to 2020-01, in an
attempt to provide guidance to the synthetic chemist on both the challenges that need to be overcome and the applications
in organic synthesis.
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Affiliation(s)
- Wengui Wang
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China
| | - Shoufeng Wang
- Shandong Provincial Key Laboratory of Fluorine Chemistry and Chemical Materials, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, China
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Shantharjun B, Vani D, Unnava R, Sandeep M, Reddy KR. Hydroxymethylation of quinolines via iron promoted oxidative C-H functionalization: synthesis of arsindoline-A and its derivatives. Org Biomol Chem 2021; 19:645-652. [PMID: 33393550 DOI: 10.1039/d0ob02212h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we report a mild and efficient hydroxymethylation of quinolines via an iron promoted cross-dehydrogenative coupling reaction under external acid free conditions. Various hydroxyalkyl substituted quinolines were achieved in excellent yields with well tolerated functional groups. Importantly, a few of the hydroxylmethylated quinolines were further transformed into respective aldehydes, and were successfully utilized for the synthesis of alkaloid arsindoline-A and its derivatives.
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Affiliation(s)
- Bangarigalla Shantharjun
- Catalysis and Fine Chemicals Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, U.P., India
| | - Damera Vani
- Catalysis and Fine Chemicals Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, U.P., India
| | - Ramanjaneyulu Unnava
- Catalysis and Fine Chemicals Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad - 500007, India.
| | - Mummadi Sandeep
- Catalysis and Fine Chemicals Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, U.P., India
| | - Kallu Rajender Reddy
- Catalysis and Fine Chemicals Division, CSIR-Indian Institute of Chemical Technology, Tarnaka, Hyderabad - 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, U.P., India
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Fuse H, Nakao H, Saga Y, Fukatsu A, Kondo M, Masaoka S, Mitsunuma H, Kanai M. Photocatalytic redox-neutral hydroxyalkylation of N-heteroaromatics with aldehydes. Chem Sci 2020; 11:12206-12211. [PMID: 34094432 PMCID: PMC8163015 DOI: 10.1039/d0sc04114a] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 10/08/2020] [Indexed: 01/02/2023] Open
Abstract
Hydroxyalkylation of N-heteroaromatics with aldehydes was achieved using a binary hybrid catalyst system comprising an acridinium photoredox catalyst and a thiophosphoric acid organocatalyst. The reaction proceeded through the following sequence: (1) photoredox-catalyzed single-electron oxidation of a thiophosphoric acid catalyst to generate a thiyl radical, (2) cleavage of the formyl C-H bond of the aldehyde substrates by a thiyl radical acting as a hydrogen atom transfer catalyst to generate acyl radicals, (3) Minisci-type addition of the resulting acyl radicals to N-heteroaromatics, and (4) a spin-center shift, photoredox-catalyzed single-electron reduction, and protonation to produce secondary alcohol products. This metal-free hybrid catalysis proceeded under mild conditions for a wide range of substrates, including isoquinolines, quinolines, and pyridines as N-heteroaromatics, as well as both aromatic and aliphatic aldehydes, and tolerated various functional groups. The reaction was applicable to late-stage derivatization of drugs and their leads.
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Affiliation(s)
- Hiromu Fuse
- Graduate School of Pharmaceutical Sciences, The University of Tokyo 7-3-1 Bunkyo-ku Tokyo 113-0033 Japan
| | - Hiroyasu Nakao
- Graduate School of Pharmaceutical Sciences, The University of Tokyo 7-3-1 Bunkyo-ku Tokyo 113-0033 Japan
| | - Yutaka Saga
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Arisa Fukatsu
- Department of Life and Coordination-Complex Molecular Science, Institute for Molecular Science (IMS) 5-1 Higashiyama, Myodaiji Okazaki Aichi 444-8787 Japan
| | - Mio Kondo
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Shigeyuki Masaoka
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University 2-1 Yamadaoka Suita Osaka 565-0871 Japan
| | - Harunobu Mitsunuma
- Graduate School of Pharmaceutical Sciences, The University of Tokyo 7-3-1 Bunkyo-ku Tokyo 113-0033 Japan
| | - Motomu Kanai
- Graduate School of Pharmaceutical Sciences, The University of Tokyo 7-3-1 Bunkyo-ku Tokyo 113-0033 Japan
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Aoki K, Yonekura K, Ikeda Y, Ueno R, Shirakawa E. Direct α‐Arylation of Alcohols with Aryl Halides through a Radical Chain Mechanism. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000216] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Kohei Aoki
- Department of Applied Chemistry for EnvironmentSchool of Science and TechnologyKwansei Gakuin University Sanda Hyogo 669-1337 Japan
| | - Kyohei Yonekura
- Department of Applied Chemistry for EnvironmentSchool of Science and TechnologyKwansei Gakuin University Sanda Hyogo 669-1337 Japan
| | - Yuko Ikeda
- Department of Applied Chemistry for EnvironmentSchool of Science and TechnologyKwansei Gakuin University Sanda Hyogo 669-1337 Japan
| | - Ryota Ueno
- Department of ChemistryGraduate School of ScienceKyoto University, Sakyo Kyoto 606-8502 Japan
| | - Eiji Shirakawa
- Department of Applied Chemistry for EnvironmentSchool of Science and TechnologyKwansei Gakuin University Sanda Hyogo 669-1337 Japan
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