1
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Miller JL, Lawrence JMIA, Rodriguez Del Rey FO, Floreancig PE. Synthetic applications of hydride abstraction reactions by organic oxidants. Chem Soc Rev 2022; 51:5660-5690. [PMID: 35712818 DOI: 10.1039/d1cs01169c] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Carbon-hydrogen bond functionalizations provide an attractive method for streamlining organic synthesis, and many strategies have been developed for conducting these transformations. Hydride-abstracting reactions have emerged as extremely effective methods for oxidative bond-forming processes due to their mild reaction conditions and high chemoselectivity. This review will predominantly focus on the mechanism, reaction development, natural product synthesis applications, approaches to catalysis, and use in enantioselective processes for hydride abstractions by quinone, oxoammonium ion, and carbocation oxidants. These are the most commonly employed hydride-abstracting agents, but recent efforts illustrate the potential for weaker ketone and triaryl borane oxidants, which will be covered at the end of the review.
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Affiliation(s)
- Jenna L Miller
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, USA.
| | - Jean-Marc I A Lawrence
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, USA.
| | | | - Paul E Floreancig
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania, 15260, USA.
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2
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Xu X, Zheng W, Ren L, Jiao P. Thermodynamic and Kinetic Studies on Copper-Catalyzed Cross-Dehydrogenative Couplings of N-aryl Glycine Esters with Phenols. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20220043] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Xiaofei Xu
- College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
| | - Wenrui Zheng
- College of Chemistry and Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
| | - Lufei Ren
- Shanghai Frontiers Science Research Center for Druggability of Cardiovascular noncoding RNA, Institute for Frontier Medical Technology, Shanghai University of Engineering Science, Shanghai, 201620, China
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3
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Miller JL, Zhou L, Liu P, Floreancig PE. Mechanism-Based Approach to Reagent Selection for Oxidative Carbon-Hydrogen Bond Cleavage Reactions. Chemistry 2021; 28:e202103078. [PMID: 34822737 DOI: 10.1002/chem.202103078] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Indexed: 11/07/2022]
Abstract
Numerous hydride-abstracting agents generate the same cationic intermediate, but substrate features such as intermediate cation stability, oxidation potential, and steric environment can influence reaction rates in an oxidant-dependent manner. This manuscript provides experimental data to illustrate the role that structural features play in the kinetics of hydride abstraction reactions with commonly used quinone-, oxoammonium ion-, and carbocation- based oxidants. Computational studies of the transition state structures and energies explain these results and energy decomposition analysis calculations reveal unique sensitivities to electrostatic attraction and steric repulsions. Rigorous rate studies of select reactions validated the capacity of the calculations to predict reactivity trends. Additionally, kinetics studies demonstrate the potential for product inhibition in DDQ-mediated reactions. These studies provide a clear guide to select the optimal oxidant for structurally disparate substrates and lead to predictions of reactivity that were validated experimentally.
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Affiliation(s)
- Jenna L Miller
- Department of Chemistry, University of Pittsburgh Pittsburgh, Pennsylvania, 15260, United States
| | - Lin Zhou
- Department of Chemistry, University of Pittsburgh Pittsburgh, Pennsylvania, 15260, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh Pittsburgh, Pennsylvania, 15260, United States
| | - Paul E Floreancig
- Department of Chemistry, University of Pittsburgh Pittsburgh, Pennsylvania, 15260, United States
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4
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Baek J, Je EK, Kim J, Qi A, Ahn KH, Kim Y. Experimental and Theoretical Studies on the Mechanism of DDQ-Mediated Oxidative Cyclization of N-Aroylhydrazones. J Org Chem 2020; 85:9727-9736. [PMID: 32614179 DOI: 10.1021/acs.joc.0c00937] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The controversial single-electron-transfer process, frequently proposed in many 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ)-mediated reactions, was investigated experimentally and theoretically using the oxidative cyclization of aroylhydrazone with DDQ. DDQ-mediated oxadiazole formation involves several processes, including cyclization to form an oxadiazole ring and N-H bond cleavage, either by proton, hydride, or hydrogen atom transfer. The detailed mechanistic study using the M06-2X density functional theory, and the 6-31+G(d,p) basis set, suggests that the pathways involving radical ion pair (RIP) intermediates, which resulted from single-electron transfer (SET), were found to be energetically nearly identical to the pathway without the SET. The substituent-dependent reactivity of oxadiazole formation was consistent with the free energy profiles of both pathways, with or without the SET. This result indicates that in addition to the electron-transfer pathway, the nucleophilic addition/elimination pathway for DDQ should be considered as a possible mechanism of the oxidative transformation reaction using DDQ.
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Affiliation(s)
- Jihye Baek
- Department of Applied Chemistry and Institute of Natural Sciences, Kyung Hee University, Yongin-si 446-701, Korea
| | - Eun-Kyung Je
- Department of Applied Chemistry and Institute of Natural Sciences, Kyung Hee University, Yongin-si 446-701, Korea
| | - Jina Kim
- Department of Applied Chemistry and Institute of Natural Sciences, Kyung Hee University, Yongin-si 446-701, Korea
| | - Ai Qi
- Department of Applied Chemistry and Institute of Natural Sciences, Kyung Hee University, Yongin-si 446-701, Korea
| | - Kwang-Hyun Ahn
- Department of Applied Chemistry and Institute of Natural Sciences, Kyung Hee University, Yongin-si 446-701, Korea
| | - Yongho Kim
- Department of Applied Chemistry and Institute of Natural Sciences, Kyung Hee University, Yongin-si 446-701, Korea
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5
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Li X, Xu J, Li SJ, Qu LB, Li Z, Chi YR, Wei D, Lan Y. Prediction of NHC-catalyzed chemoselective functionalizations of carbonyl compounds: a general mechanistic map. Chem Sci 2020; 11:7214-7225. [PMID: 34123007 PMCID: PMC8159411 DOI: 10.1039/d0sc01793k] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Generally, N-heterocyclic carbene (NHC) complexed with carbonyl compounds would transform into several important active intermediates, i.e., enolates, Breslow intermediates, or acylazolium intermediates, which act as either a nucleophile (Nu) or an electrophile (E) to react with the other E/Nu partner. Hence, the key to predicting the origin of chemoselectivity is to compute the activity (i.e., electrophilic index ω for E and nucleophilic index N for Nu) and stability of the intermediates and products, which are suggested in a general mechanistic map of these reactions. To support this point, we selected and studied different cases of the NHC-catalyzed reactions of carbonyl compounds in the presence of a base and/or an oxidant, in which multiple possible pathways involving acylazolium, enolate, Breslow, and α,β-unsaturated acylazolium intermediates were proposed and a novel index ω + N of the E and Nu partners was employed to exactly predict the energy barrier of the chemoselective step in theory. This work provides a guide for determining the general principle behind organocatalytic reactions with various chemoselectivities, and suggests a general application of the reaction index in predicting the chemoselectivity of the nucleophilic and electrophilic reactions. A novel index ω + N can be used to predict the chemoselectivity according to the general NHC-catalyzed reaction mechanism.![]()
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Affiliation(s)
- Xue Li
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University 100 Science Avenue Zhengzhou Henan 450001 China
| | - Jun Xu
- College of Pharmacy, Guizhou University of Traditional Chinese Medicine Guiyang China
| | - Shi-Jun Li
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University 100 Science Avenue Zhengzhou Henan 450001 China
| | - Ling-Bo Qu
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University 100 Science Avenue Zhengzhou Henan 450001 China
| | - Zhongjun Li
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University 100 Science Avenue Zhengzhou Henan 450001 China
| | - Yonggui Robin Chi
- Division of Chemistry & Biological Chemistry, School of Physical & Mathematical Sciences, Nanyang Technological University Singapore 637371 Singapore
| | - Donghui Wei
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University 100 Science Avenue Zhengzhou Henan 450001 China
| | - Yu Lan
- College of Chemistry, Institute of Green Catalysis, Zhengzhou University 100 Science Avenue Zhengzhou Henan 450001 China .,College of Chemistry and Chemical Engineering, Chongqing University Chongqing 400044 China
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6
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Steck V, Kolev JN, Ren X, Fasan R. Mechanism-Guided Design and Discovery of Efficient Cytochrome P450-Derived C-H Amination Biocatalysts. J Am Chem Soc 2020; 142:10343-10357. [PMID: 32407077 DOI: 10.1021/jacs.9b12859] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Cytochromes P450 have been recently identified as a promising class of biocatalysts for mediating C-H aminations via nitrene transfer, a valuable transformation for forging new C-N bonds. The catalytic efficiency of P450s in these non-native transformations is however significantly inferior to that exhibited by these enzymes in their native monooxygenase function. Using a mechanism-guided strategy, we report here the rational design of a series of P450BM3-based variants with dramatically enhanced C-H amination activity acquired through disruption of the native proton relay network and other highly conserved structural elements within this class of enzymes. This approach further guided the identification of XplA and BezE, two "atypical" natural P450s implicated in the degradation of a man-made explosive and in benzastatins biosynthesis, respectively, as very efficient C-H aminases. Both XplA and BezE could be engineered to further improve their C-H amination reactivity, which demonstrates their evolvability for abiological reactions. These engineered and natural P450 catalysts can promote the intramolecular C-H amination of arylsulfonyl azides with over 10 000-14 000 catalytic turnovers, ranking among the most efficient nitrene transfer biocatalysts reported to date. Mechanistic and structure-reactivity studies provide insights into the origin of the C-H amination reactivity enhancement and highlight the divergent structural requirements inherent to supporting C-H amination versus C-H monooxygenation reactivity within this class of enzymes. Overall, this work provides new promising scaffolds for the development of nitrene transferases and demonstrates the value of mechanism-driven rational design as a strategy for improving the catalytic efficiency of metalloenzymes in the context of abiological transformations.
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Affiliation(s)
- Viktoria Steck
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Joshua N Kolev
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Xinkun Ren
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Rudi Fasan
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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7
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Mao Z, Campbell CT. Kinetic Isotope Effects: Interpretation and Prediction Using Degrees of Rate Control. ACS Catal 2020. [DOI: 10.1021/acscatal.9b05637] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhongtian Mao
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Charles T. Campbell
- Department of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
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8
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Zhao L, Liu B, Tan Q, Ding CH, Xu B. Silver-Assisted Oxidative Isocyanide Insertion of Ethers: A Direct Approach to β-Carbonyl α-Iminonitriles. Org Lett 2019; 21:9223-9227. [DOI: 10.1021/acs.orglett.9b03590] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Leiyang Zhao
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China
| | - Bingxin Liu
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China
| | - Qitao Tan
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China
| | - Chang-Hua Ding
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China
| | - Bin Xu
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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9
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Chi H, Li H, Liu B, Ye R, Wang H, Guo YL, Tan Q, Xu B. From Isocyanides to Iminonitriles via Silver-mediated Sequential Insertion of C(sp 3)-H Bond. iScience 2019; 21:650-663. [PMID: 31731202 PMCID: PMC6859232 DOI: 10.1016/j.isci.2019.10.057] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2019] [Revised: 10/25/2019] [Accepted: 10/27/2019] [Indexed: 11/08/2022] Open
Abstract
Heterocycles are prevalent constituents of many marketing drugs and biologically active molecules to meet modern medical challenges. Isocyanide insertion into C(sp3)–H bonds is challenging especially for the construction of quaternary carbon centers. Herein, we describe an efficient strategy for the synthesis of α-iminonitrile substituted isochromans and tetrahydroisoquinolines (THIQs) with quaternary carbon centers through silver-triflate-mediated sequential isocyanide insertion of C(sp3)–H bonds, where isocyanide acts as the crucial “CN” and “imine” sources. The produced α-iminonitriles have extensive applications as valuable synthetic building blocks for pharmacologically interesting heterocycles. This protocol could be further applied for the synthesis of iminonitrile-decorated phenanthridines and azapyrene. Interestingly, a remarkable aggregation-induced emission (AIE) effect was first observed for an iminonitrile-decorated pyrene derivative, which may open a particular area for iminonitrile applications in materials science. Iminonitrile formation via sequential C(sp3)-H bond isocyanide insertion Construction of quaternary center Isocyanide as both "imine" and "CN" sources Valuable synthetic building blocks and novel AIEgen
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Affiliation(s)
- Huiwen Chi
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China
| | - Hao Li
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China
| | - Bingxin Liu
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China
| | - Rongxuan Ye
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China; Qianweichang College, Shanghai University, Shanghai 200444, China
| | - Haoyang Wang
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Yin-Long Guo
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
| | - Qitao Tan
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China.
| | - Bin Xu
- Department of Chemistry, Innovative Drug Research Center, Shanghai University, Shanghai 200444, China; State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China.
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10
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Pan D, Pan Z, Hu Z, Li M, Hu X, Jin L, Sun N, Hu B, Shen Z. Metal-Free Aerobic Oxidative C-O Coupling of C(sp
3
)-H with Carboxylic Acids Catalyzed by DDQ and tert
-Butyl Nitrite. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900773] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Decheng Pan
- College of Chemical Engineering; Zhejiang University of Technology; No. 18, Chaowang Road, Hangzhou 310014 P.R. China
| | - Zilong Pan
- College of Chemical Engineering; Zhejiang University of Technology; No. 18, Chaowang Road, Hangzhou 310014 P.R. China
| | - Zhiming Hu
- College of Chemical Engineering; Zhejiang University of Technology; No. 18, Chaowang Road, Hangzhou 310014 P.R. China
| | - Meichao Li
- College of Chemical Engineering; Zhejiang University of Technology; No. 18, Chaowang Road, Hangzhou 310014 P.R. China
| | - Xinquan Hu
- College of Chemical Engineering; Zhejiang University of Technology; No. 18, Chaowang Road, Hangzhou 310014 P.R. China
| | - Liqun Jin
- College of Chemical Engineering; Zhejiang University of Technology; No. 18, Chaowang Road, Hangzhou 310014 P.R. China
| | - Nan Sun
- College of Chemical Engineering; Zhejiang University of Technology; No. 18, Chaowang Road, Hangzhou 310014 P.R. China
| | - Baoxiang Hu
- College of Chemical Engineering; Zhejiang University of Technology; No. 18, Chaowang Road, Hangzhou 310014 P.R. China
| | - Zhenlu Shen
- College of Chemical Engineering; Zhejiang University of Technology; No. 18, Chaowang Road, Hangzhou 310014 P.R. China
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11
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Hu YL, Wang Z, Yang H, Chen J, Wu ZB, Lei Y, Zhou L. Conversion of two stereocenters to one or two chiral axes: atroposelective synthesis of 2,3-diarylbenzoindoles. Chem Sci 2019; 10:6777-6784. [PMID: 31391898 PMCID: PMC6657404 DOI: 10.1039/c9sc00810a] [Citation(s) in RCA: 90] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Accepted: 05/09/2019] [Indexed: 12/13/2022] Open
Abstract
Central-to-axial chirality conversion provides efficient access to axially chiral compounds, and several examples regarding the conversion of one, two or four stereocenters to one axis have been reported. Herein, we report the conversion of two stereocenters to one or two chiral axes for the first time. In this study, a new class of enantiomerically enriched 2,3-diarylbenzoindoles was efficiently synthesized using a chiral phosphoric acid-catalyzed [3 + 2] formal cycloaddition and a mild DDQ oxidation strategy. Moreover, a speculative model of the central-to-axial chirality conversion outcome was proposed based on preliminary mechanistic studies and DFT calculations. Potentially, using this strategy, useful chiral phosphine ligand can be synthesized smoothly (99% ee).
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Affiliation(s)
- Yu-Long Hu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education , Department of Chemistry & Materials Science , National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China .
| | - Zhe Wang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education , Department of Chemistry & Materials Science , National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China .
| | - Hui Yang
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education , Department of Chemistry & Materials Science , National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China .
| | - Jie Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education , Department of Chemistry & Materials Science , National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China .
| | - Zi-Bo Wu
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education , Department of Chemistry & Materials Science , National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China .
| | - Yibo Lei
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education , Department of Chemistry & Materials Science , National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China .
| | - Ling Zhou
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education , Department of Chemistry & Materials Science , National Demonstration Center for Experimental Chemistry Education , Northwest University , Xi'an 710127 , P. R. China .
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12
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13
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Wang Z, Mao Y, Guan H, Cao M, Hua J, Feng L, Liu L. Direct oxidative C(sp3) H cyanation of secondary benzylic ethers. CHINESE CHEM LETT 2019. [DOI: 10.1016/j.cclet.2019.03.019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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14
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Peng Z, Wang Y, Yu Z, Wu H, Fu S, Song L, Jiang C. Direct and Efficient C(
sp
3
)‐H Bond Alkylation of Tetrahydroisoquinolines and Isochroman with Alkylzinc Reagents. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900023] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Zhihua Peng
- Department of Chemistry, College of ScienceChina University of Petroleum (East China), Qingdao Shandong 266580 People's Republic of China
| | - Yilei Wang
- Department of Chemistry, College of ScienceChina University of Petroleum (East China), Qingdao Shandong 266580 People's Republic of China
| | - Zhi Yu
- Department of Chemistry, College of ScienceChina University of Petroleum (East China), Qingdao Shandong 266580 People's Republic of China
| | - Hao Wu
- Department of Chemistry, College of ScienceChina University of Petroleum (East China), Qingdao Shandong 266580 People's Republic of China
| | - Shanshan Fu
- Department of Chemistry, College of ScienceChina University of Petroleum (East China), Qingdao Shandong 266580 People's Republic of China
| | - Linhua Song
- Department of Chemistry, College of ScienceChina University of Petroleum (East China), Qingdao Shandong 266580 People's Republic of China
| | - Cuiyu Jiang
- Department of Chemistry, College of ScienceChina University of Petroleum (East China), Qingdao Shandong 266580 People's Republic of China
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15
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16
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Shariati M, Imanzadeh G, Rostami A, Ghoreishy N, Kheirjou S. Application of laccase/DDQ as a new bioinspired catalyst system for the aerobic oxidation of tetrahydroquinazolines and Hantzsch 1,4-dihydropyridines. CR CHIM 2019. [DOI: 10.1016/j.crci.2019.03.003] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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17
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Xin X, Pan X, Meng Z, Liu X, Liu L. Catalytic enantioselective cross-dehydrogenative coupling of 3,6-dihydro-2H-pyrans with aldehydes. Org Chem Front 2019. [DOI: 10.1039/c9qo00123a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The first catalytic asymmetric cross-dehydrogenative coupling of 3,6-dihydro-2H-pyrans and aldehydes with excellent enantioselectivity is described.
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Affiliation(s)
- Xiaodong Xin
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- P.R. China
| | - Xinhui Pan
- School of Pharmaceutical Sciences
- Shandong University
- Jinan 250012
- P.R. China
| | - Zhilin Meng
- School of Pharmaceutical Sciences
- Shandong University
- Jinan 250012
- P.R. China
| | - Xigong Liu
- School of Pharmaceutical Sciences
- Shandong University
- Jinan 250012
- P.R. China
| | - Lei Liu
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- P.R. China
- School of Pharmaceutical Sciences
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18
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Mao Y, Cao M, Pan X, Huang J, Li J, Xu L, Liu L. Bimolecular oxidative C–H alkynylation of α-substituted isochromans. Org Chem Front 2019. [DOI: 10.1039/c9qo00352e] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The first bimolecular oxidative C–H functionalization of secondary benzylic ethers for tertiary ether synthesis has been established in high efficiency.
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Affiliation(s)
- Ying Mao
- School of Pharmaceutical Sciences
- Shandong University
- Jinan 250012
- P.R. China
| | - Min Cao
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- P.R. China
| | - Xiaoguang Pan
- School of Pharmaceutical Sciences
- Shandong University
- Jinan 250012
- P.R. China
| | - Jiancheng Huang
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- P.R. China
| | - Jing Li
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- P.R. China
| | - Liren Xu
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- P.R. China
| | - Lei Liu
- School of Pharmaceutical Sciences
- Shandong University
- Jinan 250012
- P.R. China
- School of Chemistry and Chemical Engineering
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19
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Džambaski Z, Bondžić BP. Dehydrogenative C(sp3)–H bond functionalization of tetrahydroisoquinolines mediated by organic oxidants under mild conditions. Org Biomol Chem 2019; 17:6420-6425. [DOI: 10.1039/c9ob01090d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
DDQ and IBX are effective SET oxidants of N-aryl-protected and unprotected THIQs. Mannich and Strecker type functionalizations ensued in an overall CDC reaction.
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Affiliation(s)
- Zdravko Džambaski
- Center for Chemistry
- ICTM institute
- University of Belgrade
- 11 000 Belgrade
- Serbia
| | - Bojan P. Bondžić
- Center for Chemistry
- ICTM institute
- University of Belgrade
- 11 000 Belgrade
- Serbia
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20
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Enzymatic regeneration of DDQ in aerobic oxidation of sulfides and oxidative coupling of thiols: New bioinspired cooperative catalytic system. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2018.09.012] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Gouranourimi A, Chipman A, Babaahmadi R, Olding A, Yates BF, Ariafard A. Nazarov cyclisations initiated by DDQ-oxidised pentadienyl ether: a mechanistic investigation from the DFT perspective. Org Biomol Chem 2018; 16:9021-9029. [PMID: 30427044 DOI: 10.1039/c8ob02590h] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The Nazarov cyclisation is an important and reliable reaction for the synthesis of cyclopentenones. Density functional theory (DFT) has been utilised to study the mechanism of Nazarov cyclisations initiated by oxidation of pentadienyl ethers by a benzoquinone derivative (DDQ), as recently reported by West et al. (Angew. Chem., Int. Ed., 2017, 56, 6335). We determined that the reaction is most likely initiated by a hydride transfer from the pentadienyl ether to an oxygen of DDQ through a concerted pathway and not a single electron transfer mechanism. This oxidation by hydride abstraction leads to the formation of a pentadienyl cation from which the 4π electrocyclisation occurs, giving an alkoxycyclopentenyl cation. The ensuing cation is subsequently deprotonated by the reduced DDQ to afford an enol ether product. Consistent with experimental results, the hydride transfer is calculated to be the rate determining step and it can be accelerated by using electron donating substituents on the pentadienyl ether substrate. Indeed, the electron donating substituents increase the HOMO energy of the ether, making it more reactive toward oxidation. It is predicted that an unsubstituted benzoquinone, due to having a higher lying LUMO, shows much less reactivity than DDQ. Interestingly, we found an excellent correlation between the hydride transfer activation energy and the gap between the ether HOMO and the benzoquinone LUMO. From this correlation, we propose a predictive formula for reactivity of different types of substrates in the corresponding reaction.
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Affiliation(s)
- Ali Gouranourimi
- School of Natural Sciences-Chemistry, University of Tasmania, Hobart, Tasmania 7001, Australia.
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22
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Pan X, Liu X, Sun S, Meng Z, Liu L. Catalytic Asymmetric Cross-Dehydrogenative Coupling of 2H
-Chromenes and Aldehydes. CHINESE J CHEM 2018. [DOI: 10.1002/cjoc.201800369] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Xinhui Pan
- School of Pharmaceutical Sciences; Shandong University; Jinan Shandong 250012 China
- Key Laboratory of Xinjiang Phytomedicine Resource and Utilization, Ministry of Education; School of Pharmaceutical Sciences, Shihezi University; Shihezi Xinjiang 832002 China
| | - Xigong Liu
- School of Pharmaceutical Sciences; Shandong University; Jinan Shandong 250012 China
| | - Shutao Sun
- School of Pharmaceutical Sciences; Shandong University; Jinan Shandong 250012 China
| | - Zhilin Meng
- School of Pharmaceutical Sciences; Shandong University; Jinan Shandong 250012 China
| | - Lei Liu
- School of Pharmaceutical Sciences; Shandong University; Jinan Shandong 250012 China
- School of Chemistry and Chemical Engineering; Shandong University; Jinan Shandong 250100 China
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23
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Peng Z, Wang Y, Yu Z, Zhao D, Song L, Jiang C. Direct Arylation of Benzyl Ethers with Organozinc Reagents. J Org Chem 2018; 83:7900-7906. [PMID: 29893129 DOI: 10.1021/acs.joc.8b00776] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A novel C(sp3)-H bond arylation of benzyl ethers with Knochel-type arylzinc reagents has been developed. This transition-metal-catalyst-free reaction proceeds well under mild conditions in a simple and effective manner and enables the synthesis of a wide range of potentially biologically active benzyl ethers by using highly functionalized organozinc reagents as a carbon nucleophile.
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Affiliation(s)
- Zhihua Peng
- Department of Chemistry, College of Science , China University of Petroleum (East China) , Qingdao , Shandong 266580 , P. R. China
| | - Yilei Wang
- Department of Chemistry, College of Science , China University of Petroleum (East China) , Qingdao , Shandong 266580 , P. R. China
| | - Zhi Yu
- Department of Chemistry, College of Science , China University of Petroleum (East China) , Qingdao , Shandong 266580 , P. R. China
| | - Dezhi Zhao
- Department of Chemistry, College of Science , China University of Petroleum (East China) , Qingdao , Shandong 266580 , P. R. China
| | - Linhua Song
- Department of Chemistry, College of Science , China University of Petroleum (East China) , Qingdao , Shandong 266580 , P. R. China
| | - Cuiyu Jiang
- Department of Chemistry, College of Science , China University of Petroleum (East China) , Qingdao , Shandong 266580 , P. R. China
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24
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Yang F, Li Y, Floreancig PE, Li X, Liu L. Copper-catalyzed oxidative cross-dehydrogenative coupling of 2H-chromenes and terminal alkynes. Org Biomol Chem 2018; 16:5144-5149. [PMID: 29963678 PMCID: PMC6051884 DOI: 10.1039/c8ob00949j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
An efficient copper-catalyzed cross-dehydrogenative coupling of 2H-chromenes and terminal alkynes mediated by DDQ has been established. A protic additive, EtOH, proved to be crucial for harmonizing the oxidation with a subsequent alkynylation step by retaining the oxidation state of an oxocarbenium ion in the form of acetal. The CDC reaction exhibits a good substrate scope, with a range of terminal aryl- and alkyl alkynes being well tolerated. The copper-catalyzed alkynylation of 2H-chromene acetals with terminal alkynes was also explored.
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Affiliation(s)
- Fei Yang
- School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, China.
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25
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Li X, Wang Y, Wang Y, Tang M, Qu LB, Li Z, Wei D. Insights into the N-Heterocyclic Carbene (NHC)-Catalyzed Oxidative γ-C(sp 3)-H Deprotonation of Alkylenals and Cascade [4 + 2] Cycloaddition with Alkenylisoxazoles. J Org Chem 2018; 83:8543-8555. [PMID: 29927597 DOI: 10.1021/acs.joc.8b01112] [Citation(s) in RCA: 57] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The N-heterocyclic carbene (NHC)-catalyzed oxidative C-H deprotonations have attracted increasing attention; however, the general mechanism regarding this kind of oxidative organocatalysis remains unclear. In this paper, the competing mechanisms and origin of the stereoselectivity of the NHC-catalyzed oxidative γ-C(sp3)-H deprotonation of alkylenals and cascade [4 + 2] cycloaddition with alkenylisoxazoles were systematically investigated for the first time using density functional theory (DFT). The computed results indicate that the oxidation of the Breslow intermediate by 3,3',5,5'-tetra- tert-butyl diphenoquinone (DQ) via a hydride transfer to oxygen (HTO) pathway is the most favorable among the four competing pathways. In addition, the analyses demonstrate that oxidant DQ plays a double role, i.e., strengthening the acidity of the hydrogen of the γ-carbon of alkylenal and forming π···π interactions with conjugated C═C bonds to promote the γ-C(sp3)-H deprotonation. The NHC catalyst acts as a Lewis base, and the hydrogen-bond network between the NHC and the substrate formed in the key Michael addition step is responsible for the origin of the stereoselectivity. Further DFT calculations reveal that the nonpolar solvent can stabilize the nonpolar R isomer but destabilize the polar S isomer for the stereoselectivity-determining transition states, thus improving the stereoselectivity.
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26
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Dong J, Xia Q, Yan C, Song H, Liu Y, Wang Q. C(sp3)–H Azidation Reaction: A Protocol for Preparation of Aminals. J Org Chem 2018; 83:4516-4524. [DOI: 10.1021/acs.joc.8b00235] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Jianyang Dong
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Qing Xia
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Changcun Yan
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Hongjian Song
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Yuxiu Liu
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Qingmin Wang
- State Key Laboratory of Elemento-Organic Chemistry, Research Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin 300071, People’s Republic of China
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27
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Morales-Rivera CA, Floreancig PE, Liu P. Predictive Model for Oxidative C–H Bond Functionalization Reactivity with 2,3-Dichloro-5,6-dicyano-1,4-benzoquinone. J Am Chem Soc 2017; 139:17935-17944. [DOI: 10.1021/jacs.7b08902] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
| | - Paul E. Floreancig
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Peng Liu
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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28
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Xia Q, Wang Q, Yan C, Dong J, Song H, Li L, Liu Y, Wang Q, Liu X, Song H. Merging Photoredox with Brønsted Acid Catalysis: The Cross-Dehydrogenative C−O Coupling for sp3
C−H Bond Peroxidation. Chemistry 2017; 23:10871-10877. [DOI: 10.1002/chem.201701755] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Qing Xia
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Qiang Wang
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Changcun Yan
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Jianyang Dong
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Hongjian Song
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Ling Li
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Yuxiu Liu
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Qingmin Wang
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin); Tianjin 300071 P. R. China
| | - Xiangming Liu
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
| | - Haibin Song
- State Key Laboratory of Elemento-Organic Chemistry; Research Institute of Elemento-Organic Chemistry; Nankai University; Tianjin 300071 P. R. China
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29
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Tsang ASK, Hashmi ASK, Comba P, Kerscher M, Chan B, Todd MH. N-Aryl Groups Are Ubiquitous in Cross-Dehydrogenative Couplings Because They Stabilize Reactive Intermediates. Chemistry 2017; 23:9313-9318. [DOI: 10.1002/chem.201700430] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Indexed: 11/11/2022]
Affiliation(s)
| | - A. Stephen K. Hashmi
- Institute of Organic Chemistry; Im Neuenheimer Feld 270, Heidelberg University 69120 Heidelberg Germany
- Chemistry Department; Faculty of Science; King Abdulaziz University (KAU); Jeddah 21589 Saudi Arabia
| | - Peter Comba
- Institute of Inorganic Chemistry; Heidelberg University; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Marion Kerscher
- Institute of Inorganic Chemistry; Heidelberg University; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Bun Chan
- School of Chemistry; The University of Sydney, NSW; 2006 Australia
- Current address: Graduate School of Engineering; Nagasaki University; Bunkyo 1-14 Nagasaki 852-8521 Japan
| | - Matthew H. Todd
- School of Chemistry; The University of Sydney, NSW; 2006 Australia
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30
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Wan M, Sun S, Li Y, Liu L. Organocatalytic Redox Deracemization of Cyclic Benzylic Ethers Enabled by An Acetal Pool Strategy. Angew Chem Int Ed Engl 2017; 56:5116-5120. [DOI: 10.1002/anie.201701439] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Indexed: 01/26/2023]
Affiliation(s)
- Miao Wan
- School of Pharmaceutical Sciences; Shandong University; Jinan 250012 P.R. China
| | - Shutao Sun
- School of Pharmaceutical Sciences; Shandong University; Jinan 250012 P.R. China
| | - Yangshan Li
- School of Pharmaceutical Sciences; Shandong University; Jinan 250012 P.R. China
| | - Lei Liu
- School of Pharmaceutical Sciences; Shandong University; Jinan 250012 P.R. China
- School of Chemistry and Chemical Engineering; Shandong University; Jinan 250100 P.R. China
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31
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Wan M, Sun S, Li Y, Liu L. Organocatalytic Redox Deracemization of Cyclic Benzylic Ethers Enabled by An Acetal Pool Strategy. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201701439] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Miao Wan
- School of Pharmaceutical Sciences; Shandong University; Jinan 250012 P.R. China
| | - Shutao Sun
- School of Pharmaceutical Sciences; Shandong University; Jinan 250012 P.R. China
| | - Yangshan Li
- School of Pharmaceutical Sciences; Shandong University; Jinan 250012 P.R. China
| | - Lei Liu
- School of Pharmaceutical Sciences; Shandong University; Jinan 250012 P.R. China
- School of Chemistry and Chemical Engineering; Shandong University; Jinan 250100 P.R. China
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32
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Shu W, Nevado C. Visible-Light-Mediated Remote Aliphatic C−H Functionalizations through a 1,5-Hydrogen Transfer Cascade. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201609885] [Citation(s) in RCA: 61] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Wei Shu
- Department of Chemistry; University of Zürich; Winterthurerstrasse 190 8057 Zürich Switzerland
| | - Cristina Nevado
- Department of Chemistry; University of Zürich; Winterthurerstrasse 190 8057 Zürich Switzerland
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33
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Shu W, Nevado C. Visible-Light-Mediated Remote Aliphatic C-H Functionalizations through a 1,5-Hydrogen Transfer Cascade. Angew Chem Int Ed Engl 2017; 56:1881-1884. [PMID: 28097790 DOI: 10.1002/anie.201609885] [Citation(s) in RCA: 193] [Impact Index Per Article: 27.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2016] [Indexed: 01/09/2023]
Abstract
A redox-neutral, light-mediated functionalization of unactivated C(sp3 )-H bonds via iminyl radicals is presented here. A 1,5-H transfer followed by the functionalization of a C(sp2 )-H bond takes place in aqueous media producing a variety of elaborated fused ketones. Mechanistic investigations have revealed 1,5-H transfer as the reversible, rate-determining step in this transformation. Divergent scaffolds are also accessible via C(sp3 )-N bond formation upon a careful choice of the reaction additives.
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Affiliation(s)
- Wei Shu
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland
| | - Cristina Nevado
- Department of Chemistry, University of Zürich, Winterthurerstrasse 190, 8057, Zürich, Switzerland
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34
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Liu TX, Ma J, Chao D, Zhang P, Ma N, Liu Q, Shi L, Zhang Z, Zhang G. Synthesis of C60-Fused Tetrahydrocarbazole/Dibenzothiophene/Benzothiophene and Dibenzofuran Derivatives via Metal-Free Oxidative Dehydrogenative Carboannulation. Org Lett 2016; 18:4044-7. [DOI: 10.1021/acs.orglett.6b01902] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Tong-Xin Liu
- Collaborative
Innovation
Center of Henan Province for Green Manufacturing of Fine Chemicals,
Key Laboratory of Green Chemical Media and Reactions, Ministry of
Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Jinliang Ma
- Collaborative
Innovation
Center of Henan Province for Green Manufacturing of Fine Chemicals,
Key Laboratory of Green Chemical Media and Reactions, Ministry of
Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Di Chao
- Collaborative
Innovation
Center of Henan Province for Green Manufacturing of Fine Chemicals,
Key Laboratory of Green Chemical Media and Reactions, Ministry of
Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Pengling Zhang
- Collaborative
Innovation
Center of Henan Province for Green Manufacturing of Fine Chemicals,
Key Laboratory of Green Chemical Media and Reactions, Ministry of
Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Nana Ma
- Collaborative
Innovation
Center of Henan Province for Green Manufacturing of Fine Chemicals,
Key Laboratory of Green Chemical Media and Reactions, Ministry of
Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Qingfeng Liu
- Collaborative
Innovation
Center of Henan Province for Green Manufacturing of Fine Chemicals,
Key Laboratory of Green Chemical Media and Reactions, Ministry of
Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Lei Shi
- Collaborative
Innovation
Center of Henan Province for Green Manufacturing of Fine Chemicals,
Key Laboratory of Green Chemical Media and Reactions, Ministry of
Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Zhiguo Zhang
- Collaborative
Innovation
Center of Henan Province for Green Manufacturing of Fine Chemicals,
Key Laboratory of Green Chemical Media and Reactions, Ministry of
Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
| | - Guisheng Zhang
- Collaborative
Innovation
Center of Henan Province for Green Manufacturing of Fine Chemicals,
Key Laboratory of Green Chemical Media and Reactions, Ministry of
Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, Henan 453007, P. R. China
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35
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Affiliation(s)
- Nathan A. Romero
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - David A. Nicewicz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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36
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Yao SG, Meier MS, Pace III RB, Crocker M. A comparison of the oxidation of lignin model compounds in conventional and ionic liquid solvents and application to the oxidation of lignin. RSC Adv 2016. [DOI: 10.1039/c6ra18806k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The oxidation of lignin model compounds in ionic liquid solvents was investigated as a prelude to the oxidation of lignin in these solvents where the polymer is appreciably soluble.
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Affiliation(s)
- Soledad G. Yao
- Department of Chemistry
- University of Kentucky
- Lexington
- USA
| | - Mark S. Meier
- Department of Chemistry
- University of Kentucky
- Lexington
- USA
| | | | - Mark Crocker
- Department of Chemistry
- University of Kentucky
- Lexington
- USA
- Center for Applied Energy Research
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37
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Xiang M, Meng QY, Gao XW, Lei T, Chen B, Tung CH, Wu LZ. Reactivity and mechanistic insight into the cross coupling reaction between isochromans and β-keto esters through C–H bond activation under visible light irradiation. Org Chem Front 2016. [DOI: 10.1039/c5qo00412h] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The formation of a C(sp3)–C(sp3) bond next to an oxygen atom from two different C–H bonds is realized by oxidative photocatalysis.
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Affiliation(s)
- Ming Xiang
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Qing-Yuan Meng
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Xue-Wang Gao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Tao Lei
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Bin Chen
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Chen-Ho Tung
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Li-Zhu Wu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry & University of Chinese Academy of Sciences
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
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38
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Reddy BVS, Anjum SR, Sridhar B. A novel self-terminated Prins strategy for the synthesis of tetrahydropyran-4-one derivatives and their behaviour in Fisher indole synthesis. RSC Adv 2016. [DOI: 10.1039/c6ra11218h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A novel self-terminated Prins strategy has been developed for the synthesis of 2-substituted tetrahydropyran-4-one derivatives through a condensation of 3-(phenylthio)but-3-en-1-ol with carbonyl compounds in the presence of 5 mol% of Sc(OTf)3 under mild conditions.
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Affiliation(s)
- B. V. Subba Reddy
- Centre for Semiochemicals
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
| | - S. Rehana Anjum
- Centre for Semiochemicals
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
| | - B. Sridhar
- Laboratory of X-ray Crystallography
- CSIR-Indian Institute of Chemical Technology
- Hyderabad
- India
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39
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Wendlandt AE, Stahl SS. Quinone-Catalyzed Selective Oxidation of Organic Molecules. Angew Chem Int Ed Engl 2015; 54:14638-58. [PMID: 26530485 PMCID: PMC4859943 DOI: 10.1002/anie.201505017] [Citation(s) in RCA: 241] [Impact Index Per Article: 26.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Indexed: 01/12/2023]
Abstract
Quinones are common stoichiometric reagents in organic chemistry. Para-quinones with high reduction potentials, such as DDQ and chloranil, are widely used and typically promote hydride abstraction. In recent years, many catalytic applications of these methods have been achieved by using transition metals, electrochemistry, or O2 to regenerate the oxidized quinone in situ. Complementary studies have led to the development of a different class of quinones that resemble the ortho-quinone cofactors in copper amine oxidases and mediate the efficient and selective aerobic and/or electrochemical dehydrogenation of amines. The latter reactions typically proceed by electrophilic transamination and/or addition-elimination reaction mechanisms, rather than hydride abstraction pathways. The collective observations show that the quinone structure has a significant influence on the reaction mechanism and has important implications for the development of new quinone reagents and quinone-catalyzed transformations.
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Affiliation(s)
- Alison E Wendlandt
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706 (USA)
| | - Shannon S Stahl
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706 (USA).
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40
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Wendlandt AE, Stahl SS. Chinon‐katalysierte, selektive Oxidation organischer Moleküle. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201505017] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Alison E. Wendlandt
- Department of Chemistry, University of Wisconsin‐Madison, 1101 University Avenue, Madison, Wisconsin 53706 (USA)
| | - Shannon S. Stahl
- Department of Chemistry, University of Wisconsin‐Madison, 1101 University Avenue, Madison, Wisconsin 53706 (USA)
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41
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Xiang M, Meng QY, Li JX, Zheng YW, Ye C, Li ZJ, Chen B, Tung CH, Wu LZ. Activation of CH Bonds through Oxidant-Free Photoredox Catalysis: Cross-Coupling Hydrogen-Evolution Transformation of Isochromans and β-Keto Esters. Chemistry 2015; 21:18080-4. [DOI: 10.1002/chem.201503361] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Indexed: 12/21/2022]
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42
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Chen Q, Zhou J, Wang Y, Wang C, Liu X, Xu Z, Lin L, Wang R. Transition-Metal-Free Dehydrosilylative Difluoroamidation of Tetrahydroisoquinolines under Mild Conditions. Org Lett 2015; 17:4212-5. [DOI: 10.1021/acs.orglett.5b01997] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Qiao Chen
- Key Laboratory of Preclinical
Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Jiawei Zhou
- Key Laboratory of Preclinical
Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Yanan Wang
- Key Laboratory of Preclinical
Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Chao Wang
- Key Laboratory of Preclinical
Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Xihong Liu
- Key Laboratory of Preclinical
Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Zhaoqing Xu
- Key Laboratory of Preclinical
Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Li Lin
- Key Laboratory of Preclinical
Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
| | - Rui Wang
- Key Laboratory of Preclinical
Study for New Drugs of Gansu Province, School of Basic Medical Sciences, Lanzhou University, Lanzhou 730000, China
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43
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Affiliation(s)
- GuangRong Peh
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
| | - Paul E. Floreancig
- Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, United States
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44
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Singh R, Kolev JN, Sutera PA, Fasan R. Enzymatic C(sp 3)-H Amination: P450-Catalyzed Conversion of Carbonazidates into Oxazolidinones. ACS Catal 2015; 5:1685-1691. [PMID: 25954592 PMCID: PMC4416466 DOI: 10.1021/cs5018612] [Citation(s) in RCA: 137] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 01/29/2015] [Indexed: 11/28/2022]
Abstract
Cytochrome P450 enzymes can effectively promote the activation and cyclization of carbonazidate substrates to yield oxazolidinones via an intramolecular nitrene C-H insertion reaction. Investigation of the substrate scope shows that while benzylic/allylic C-H bonds are most readily aminated by these biocatalysts, stronger, secondary C-H bonds are also accessible to functionalization. Leveraging this "non-native" reactivity and assisted by fingerprint-based predictions, improved active-site variants of the bacterial P450 CYP102A1 could be identified to mediate the aminofunctionalization of two terpene natural products with high regio- and stereoselectivity. Mechanistic studies and KIE experiments show that the C-H activation step in these reactions is rate-limiting and proceeds in a stepwise manner, namely, via hydrogen atom abstraction followed by radical recombination. This study expands the reactivity scope of P450-based catalysts in the context of nitrene transfer transformations and provides first-time insights into the mechanism of P450-catalyzed C-H amination reactions.
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Affiliation(s)
- Ritesh Singh
- Department of Chemistry, University
of Rochester, Rochester, New York 14627, United
States
| | - Joshua N. Kolev
- Department of Chemistry, University
of Rochester, Rochester, New York 14627, United
States
| | - Philip A. Sutera
- Department of Chemistry, University
of Rochester, Rochester, New York 14627, United
States
| | - Rudi Fasan
- Department of Chemistry, University
of Rochester, Rochester, New York 14627, United
States
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45
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Cheng D, Yuan K, Xu X, Yan J. The oxidative coupling of benzylic compounds catalyzed by 2,3-dichloro-5,6-dicyano-benzoquinone and sodium nitrite using molecular oxygen as a co-oxidant. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.02.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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46
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Chen W, Xie Z, Zheng H, Lou H, Liu L. Structurally diverse α-substituted benzopyran synthesis through a practical metal-free C(sp3)-H functionalization. Org Lett 2014; 16:5988-91. [PMID: 25386987 DOI: 10.1021/ol503004a] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A trityl ion-mediated practical C-H functionalization of a variety of benzopyrans with a wide range of nucleophiles (organoboranes and C-H molecules) at ambient temperature has been disclosed. The metal-free reaction has an excellent functional group tolerance and high chemoselectivity and displays a broad scope with respect to both benzopyran and nucleophile partners, efficiently affording a collection of benzopyrans bearing diverse skeletons and α-functionalities in one step.
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Affiliation(s)
- Wenfang Chen
- Key Laboratory of Chemical Biology of Ministry of Education, School of Pharmaceutical Sciences, Shandong University , Jinan 250012, PR China
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47
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Wan M, Meng Z, Lou H, Liu L. Practical and highly selective C-H functionalization of structurally diverse ethers. Angew Chem Int Ed Engl 2014; 53:13845-9. [PMID: 25346297 DOI: 10.1002/anie.201407083] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2014] [Revised: 08/31/2014] [Indexed: 11/10/2022]
Abstract
A trityl ion mediated C-H functionalization of ethers with a wide range of nucleophiles at ambient temperature has been developed. The reaction displays high chemoselectivity and good functional group tolerance. The protocol also exhibits excellent regio- and diastereoselectivities for the unsymmetric ethers, thus stereoselectively generating highly functionalized disubstituted 2,5-trans tetrahydrofurans (THF), 2,6-trans tetrahydropyrans (THP), 2,6-trans dihydropyrans (DHP), and 1,3-trans isochromans, and highlighting the capacity of the protocol in complex molecule synthesis.
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Affiliation(s)
- Miao Wan
- Key Lab of Chemical Biology of Ministry of Education, School of Pharmaceutical Sciences, Shandong University, Jinan 250012 (China)
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48
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Wan M, Meng Z, Lou H, Liu L. Practical and Highly Selective CH Functionalization of Structurally Diverse Ethers. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201407083] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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49
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Han X, Floreancig PE. Spiroacetal formation through telescoped cycloaddition and carbon-hydrogen bond functionalization: total synthesis of bistramide A. Angew Chem Int Ed Engl 2014; 53:11075-8. [PMID: 25196585 PMCID: PMC4234310 DOI: 10.1002/anie.201406819] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Indexed: 11/07/2022]
Abstract
Spiroacetals can be formed through a one-pot sequence of a hetero-Diels-Alder reaction, an oxidative carbon-hydrogen bond cleavage, and an acid treatment. This convergent approach expedites access to a complex molecular subunit which is present in numerous biologically active structures. The utility of the protocol is demonstrated through its application to a brief synthesis of the actin-binding cytotoxin bistramide A.
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Affiliation(s)
- Xun Han
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260 (USA)
| | - Paul E. Floreancig
- Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260 (USA)
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50
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Han X, Floreancig PE. Spiroacetal Formation through Telescoped Cycloaddition and Carbon-Hydrogen Bond Functionalization: Total Synthesis of Bistramide A. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201406819] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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