1
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Rekha, Fatma S, Sharma S, Anand RV. Eosin Y-catalyzed reductive homocoupling of para-quinone methides under visible-light. Photochem Photobiol 2024. [PMID: 38597042 DOI: 10.1111/php.13946] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 03/17/2024] [Accepted: 03/18/2024] [Indexed: 04/11/2024]
Abstract
In this manuscript, we demonstrate a visible-light driven dimerization of para-quinone methides using eosin Y catalyst via a reductive homocoupling process. This mild and operationally simple methodology was found to be compatible with a variety of differently substituted para-quinone methides and a broad range of tetra-arylethane derivatives were obtained in moderate to good yields (47%-87%).
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Affiliation(s)
- Rekha
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Manauli (PO), Punjab, India
| | - Shaheen Fatma
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Manauli (PO), Punjab, India
| | - Sonam Sharma
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Manauli (PO), Punjab, India
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Manauli (PO), Punjab, India
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2
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Nguyen TH, Pauly C, Kent GT, Wu G, Hayton TW. Dimerization and ring-opening in bis(diisopropylamino)cyclopropenylidene (BAC) mediated by [U(NR 2) 3(CCPh)] (R = SiMe 3). Dalton Trans 2023; 52:13868-13871. [PMID: 37751280 DOI: 10.1039/d3dt02741d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/27/2023]
Abstract
Addition of 2 equiv. of bis(diisopropylamino)cyclopropenylidene (BAC) to [U(NR2)3(CCPh)] (1, R = SiMe3), in Et2O, results in formation of [cyclo-N(iPr)C(Me)2CH(NiPr2)C{CHC3(NiPr2)2}][U(NR2)2(N(SiMe3)SiMe2CH2)(CCPh)] (2) in moderate isolated yield. Complex 2 is the result of coupling and protonation of two BAC molecules, where complex 1 contributes the required proton. It was characterized by NMR spectroscopy and X-ray crystallography and represents a new mode of reactivity of the cyclopropenylidene fragment.
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Affiliation(s)
- Thien H Nguyen
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
| | - Christophe Pauly
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
| | - Greggory T Kent
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
| | - Guang Wu
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
| | - Trevor W Hayton
- Department of Chemistry and Biochemistry, University of California Santa Barbara, Santa Barbara, CA 93106, USA.
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3
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Singh T, Upreti GC, Arora S, Chauhan H, Singh A. Visible Light-Mediated Carbamoylation of para-Quinone Methides. J Org Chem 2023. [PMID: 36792547 DOI: 10.1021/acs.joc.2c02394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
We report a photocatalytic approach for the installation of the amide moiety onto para-quinone methides. This transformation features a net reductive approach for the generation of carbamoyl radicals from amide-substituted Hantzsch ester derivatives under transition metal-free conditions. This protocol exhibits wide scope and allows access to diarylacetamides employing a C-C bond formation approach.
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Affiliation(s)
- Tavinder Singh
- Department of Chemistry, IIT Kanpur, Kanpur, UP 208016, India
| | | | - Shivani Arora
- Department of Chemistry, IIT Kanpur, Kanpur, UP 208016, India
| | | | - Anand Singh
- Department of Chemistry, IIT Kanpur, Kanpur, UP 208016, India.,Department of Sustainable Energy Engineering, IIT Kanpur, Kanpur, UP 208016, India
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4
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Xiong B, Si L, Zhu L, Wu R, Liu Y, Xu W, Zhang F, Tang KW, Wong WY. Room-Temperature ZnBr 2 -Catalyzed Regioselective 1,6-Hydroarylation of Electron-Rich Arenes to para-Quinone Methides: Synthesis of Unsymmetrical Triarylmethanes. Chem Asian J 2023; 18:e202201156. [PMID: 36507597 DOI: 10.1002/asia.202201156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 12/10/2022] [Accepted: 12/12/2022] [Indexed: 12/14/2022]
Abstract
A mild and efficient Zn(II)-catalyzed regioselective 1,6-hydroarylation of para-quinone methides (p-QMs) with electron-rich arenes protocol is reported. A variety of electron-rich arenes and para-quinone methides are well tolerated under mild conditions, delivering a broad range of triarylmethanes in good to excellent yields. The present method also works well for the hydroarylation of p-QMs with other nucleophiles, such as aniline, indole and phenol derivatives, offering the corresponding triarylmethanes with good yields under the standard conditions. The possible mechanism for the formation of C(sp3 )-C(sp2 ) bonds in hydroarylation reactions has been explored by step-by-step control experiments, and the reaction may follow a second-order manner in a chemical kinetic study.
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Affiliation(s)
- Biquan Xiong
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, 414006, Yueyang, P. R. China.,Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University Hung Hom, Hong Kong, P. R. China
| | - Lulu Si
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, 414006, Yueyang, P. R. China
| | - Longzhi Zhu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, 414006, Yueyang, P. R. China.,Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University Hung Hom, Hong Kong, P. R. China
| | - Rong Wu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, 414006, Yueyang, P. R. China
| | - Yu Liu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, 414006, Yueyang, P. R. China
| | - Weifeng Xu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, 414006, Yueyang, P. R. China
| | - Fan Zhang
- College of Chemistry and Chemical Engineering, Jishou University, 416000, Jishou, P. R. China
| | - Ke-Wen Tang
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, 414006, Yueyang, P. R. China
| | - Wai-Yeung Wong
- Department of Applied Biology and Chemical Technology and Research Institute for Smart Energy, The Hong Kong Polytechnic University Hung Hom, Hong Kong, P. R. China
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5
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Xiong B, Shang W, Xu W, Liu Y, Tang KW, Wong WY. Acid‐catalyzed Regioselective Synthesis of α‐Diarylmethyl Substituted Phenols and para‐Quinone Methides in Water. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200295] [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)
- Biquan Xiong
- Hunan Institute of Science and Technology Department of Chemistry and Chemical Engineering Xueyuan Road 414006 Yueyang CHINA
| | - Wenli Shang
- Hunan Institute of Science and Technology Department of Chemistry and Chemical Engineering Xueyuan Road 414006 Yueyang CHINA
| | - Weifeng Xu
- Hunan Institute of Science and Technology Department of Chemistry and Chemical Engineering Xueyuan Road 414006 Yueyang CHINA
| | - Yu Liu
- Hunan Institute of Science and Technology Department of Chemistry and Chemical Engineering Xueyuan Road 414006 Yueyang CHINA
| | - Ke-Wen Tang
- Hunan Institute of Science and Technology Department of Chemistry and Chemical Engineering Xueyuan Road 414006 Yueyang CHINA
| | - Wai-Yeung Wong
- The Hong Kong Polytechnic University Department of Applied Biology and Chemical Technology Hung Hom Hong Kong HONG KONG
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6
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Kumar S, Vaishanv NK, Mohanan K. Efficient Construction of 3‐Fluoroalkylated Oxindoles Enabled by Zwitterion Catalysis. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Sandeep Kumar
- Central Drug Research Institute Medicinal and Process Chemistry Division Lucknow INDIA
| | | | - Kishor Mohanan
- CSIR-Central Drug Research Institute Medicinal and Process Chemistry Sector-10Jankipuram ExtensionSitapur Road 226031 Lucknow INDIA
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7
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Xiong B, Xu S, Xu W, Liu Y, Zhang L, Tang K, Yin SF, Wong WYR. Silver-Catalyzed Regioselective 1,6-Hydroarylation of para-Quinone Methides with Anilines and Phenols. Org Chem Front 2022. [DOI: 10.1039/d2qo00541g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple and efficient method for the silver-catalyzed regioselective 1,6-hydroarylation of para-quinone methides (p-QMs) with anilines and phenols has been established. Without the need for pre-protection, a broad range of...
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8
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He C, Zhong Y, Han H, Wang Q, Xu L, Zhang T, Hu Y, Huang Q, Liu J, Yang M. Photoinduced decarboxylative 1,6-addition of para-quinone methides with α-keto acids: an eco-friendly approach to α,α′-diarylated ketones. NEW J CHEM 2022. [DOI: 10.1039/d2nj04562a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The photoinduced decarboxylative 1,6-addition of para-quinone methides with α-keto acids in an eco-friendly approach to α,α′-diarylated ketones is developed.
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Affiliation(s)
- Chen He
- Key Laboratory of Biomaterials and Biofabrication in Tissue Engineering of Jiangxi Province, Oil-tea in Medical Health Care and Functional Product Development Engineering Research Center in Jiangxi, Key Laboratory of Biomedical Sensors of Ganzhou, School of Pharmacy, Gannan Medical University, Ganzhou, 341000, China
| | - Yingfang Zhong
- Key Laboratory of Biomaterials and Biofabrication in Tissue Engineering of Jiangxi Province, Oil-tea in Medical Health Care and Functional Product Development Engineering Research Center in Jiangxi, Key Laboratory of Biomedical Sensors of Ganzhou, School of Pharmacy, Gannan Medical University, Ganzhou, 341000, China
| | - Huiqi Han
- Key Laboratory of Biomaterials and Biofabrication in Tissue Engineering of Jiangxi Province, Oil-tea in Medical Health Care and Functional Product Development Engineering Research Center in Jiangxi, Key Laboratory of Biomedical Sensors of Ganzhou, School of Pharmacy, Gannan Medical University, Ganzhou, 341000, China
| | - Qi Wang
- Key Laboratory of Biomaterials and Biofabrication in Tissue Engineering of Jiangxi Province, Oil-tea in Medical Health Care and Functional Product Development Engineering Research Center in Jiangxi, Key Laboratory of Biomedical Sensors of Ganzhou, School of Pharmacy, Gannan Medical University, Ganzhou, 341000, China
| | - Lijing Xu
- Key Laboratory of Biomaterials and Biofabrication in Tissue Engineering of Jiangxi Province, Oil-tea in Medical Health Care and Functional Product Development Engineering Research Center in Jiangxi, Key Laboratory of Biomedical Sensors of Ganzhou, School of Pharmacy, Gannan Medical University, Ganzhou, 341000, China
| | - Ting Zhang
- Key Laboratory of Biomaterials and Biofabrication in Tissue Engineering of Jiangxi Province, Oil-tea in Medical Health Care and Functional Product Development Engineering Research Center in Jiangxi, Key Laboratory of Biomedical Sensors of Ganzhou, School of Pharmacy, Gannan Medical University, Ganzhou, 341000, China
| | - Yaqiong Hu
- Key Laboratory of Biomaterials and Biofabrication in Tissue Engineering of Jiangxi Province, Oil-tea in Medical Health Care and Functional Product Development Engineering Research Center in Jiangxi, Key Laboratory of Biomedical Sensors of Ganzhou, School of Pharmacy, Gannan Medical University, Ganzhou, 341000, China
| | - Qitong Huang
- Key Laboratory of Biomaterials and Biofabrication in Tissue Engineering of Jiangxi Province, Oil-tea in Medical Health Care and Functional Product Development Engineering Research Center in Jiangxi, Key Laboratory of Biomedical Sensors of Ganzhou, School of Pharmacy, Gannan Medical University, Ganzhou, 341000, China
| | - Jun Liu
- Department of Neurosurgery, the Affiliated Ganzhou Hospital of Nanchang University, Ganzhou, Jiangxi Province, 341000, China
| | - Min Yang
- Key Laboratory of Biomaterials and Biofabrication in Tissue Engineering of Jiangxi Province, Oil-tea in Medical Health Care and Functional Product Development Engineering Research Center in Jiangxi, Key Laboratory of Biomedical Sensors of Ganzhou, School of Pharmacy, Gannan Medical University, Ganzhou, 341000, China
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9
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Rekha, Sharma S, Singh G, Vijaya Anand R. Tropylium Salt-Promoted Vinylogous Aza-Michael Addition of Carbamates to para-Quinone Methides: Elaboration to Diastereomerically Pure α,α'-Diarylmethyl Carbamates. ACS ORGANIC & INORGANIC AU 2021; 2:186-196. [PMID: 36855457 PMCID: PMC9954356 DOI: 10.1021/acsorginorgau.1c00033] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Carbocation catalysis is emerging as an important subarea of Lewis acid catalysis. Some stable and isolable carbocations have been successfully utilized as Lewis acid catalysts and promoters in many synthetic transformations. In this manuscript, we report a tropylium cation-promoted vinylogous aza-Michael addition of carbamates to para-quinone methides (QMs) to access a wide range of unsymmetrical α,α'-diarylmethyl carbamates. This mild protocol was effective for the vinylogous conjugate addition of (-)-menthyl carbamate to p-QMs, and the respective diastereomerically pure α,α'-diarylmethyl carbamate derivatives could be obtained in excellent yields and diastereoselectivities (up to >20:1 de).
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10
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Shirsath SR, Chandgude SM, Muthukrishnan M. Iron catalyzed tandem ring opening/1,6-conjugate addition of cyclopropanols with p-quinone methides: new access to γ,γ-diaryl ketones. Chem Commun (Camb) 2021; 57:13582-13585. [PMID: 34846388 DOI: 10.1039/d1cc05997a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
An iron(III) catalyzed tandem ring opening/1,6-conjugate addition of cyclopropanols to p-quinone methides leading to γ,γ-diaryl ketones has been described. This catalytic protocol provides a novel and efficient method to access γ,γ-diaryl ketone derivatives in good to excellent yields with high functional group tolerance. Importantly, γ,γ-diaryl ketone can be further functionalized to give a versatile set of useful products.
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Affiliation(s)
- Sachin R Shirsath
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Pune 411008, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sagar M Chandgude
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Pune 411008, India.
| | - M Muthukrishnan
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Pune 411008, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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11
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Ranga PK, Ahmad F, Singh G, Tyagi A, Vijaya Anand R. Recent advances in the organocatalytic applications of cyclopropene- and cyclopropenium-based small molecules. Org Biomol Chem 2021; 19:9541-9564. [PMID: 34704583 DOI: 10.1039/d1ob01549d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The development of novel small molecule-based catalysts for organic transformations has increased noticeably in the last two decades. A very recent addition to this particular research area is cyclopropene- and cyclopropenium-based catalysts. At one point in time, particularly in the mid-20th century, much attention was focused on the structural aspects and physical properties of cyclopropene-based compounds. However, a paradigm shift was observed in the late 20th century, and the focus shifted to the synthetic utility of these compounds. In fact, a wide range of cyclopropene derivatives have been found serving as valuable synthons for the construction of carbocycles, heterocycles and other useful organic compounds. In the last few years, the catalytic applications of cyclopropene/cyclopropenium-based compounds have been uncovered and many synthetic protocols have been developed using cyclopropene-based compounds as organocatalysts. Therefore, the main objective of this review is to highlight recent developments in the catalytic applications of cyclopropene-based small molecules in different areas of organocatalysis such as phase-transfer catalysis (PTC), Brønsted base catalysis, hydrogen-bond donor catalysis, nucleophilic carbene catalysis, and electrophotocatalysis developed within the past two decades.
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Affiliation(s)
- Pavit K Ranga
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Feroz Ahmad
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Gurdeep Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Akshi Tyagi
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
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12
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Xu S, Xie J, Liu Y, Xu W, Tang KW, Xiong B, Wong WY. Silver-Catalyzed Regioselective Phosphorylation of para-Quinone Methides with P(III)-Nucleophiles. J Org Chem 2021; 86:14983-15003. [PMID: 34665625 DOI: 10.1021/acs.joc.1c01703] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A simple and efficient method for the silver-catalyzed regioselective phosphorylation of para-quinone methides (p-QMs) with P(III)-nucleophiles (P(OR)3, ArP(OR)2, Ar2P-OR) has been established via Michaelis-Arbuzov-type reaction. A broad range of P(III)-nucleophiles and para-quinone methides are well tolerated under the mild conditions, giving the expected diarylmethyl-substituted organophosphorus compounds with good to excellent yields. Moreover, a series of corresponding enantiomers can be obtained by employing dialkyl arylphosphonite (ArP(OR)2) as substrates. The control experiments and 31P NMR tracking experiments were also performed to gain insights for the plausible reaction mechanism. This protocol may have significant implications for the formation of C(sp3)-P bonds in Michaelis-Arbuzov-type reactions.
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Affiliation(s)
- Shipan Xu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, P. R. China
| | - Jun Xie
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, P. R. China
| | - Yu Liu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, P. R. China
| | - Weifeng Xu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, P. R. China
| | - Ke-Wen Tang
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, P. R. China
| | - Biquan Xiong
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, P. R. China.,Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
| | - Wai-Yeung Wong
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
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13
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Arokianathar JN, Hartley WC, McLaughlin C, Greenhalgh MD, Stead D, Ng S, Slawin AMZ, Smith AD. Isothiourea-Catalyzed Enantioselective α-Alkylation of Esters via 1,6-Conjugate Addition to para-Quinone Methides. Molecules 2021; 26:6333. [PMID: 34770741 PMCID: PMC8588318 DOI: 10.3390/molecules26216333] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/12/2021] [Accepted: 10/14/2021] [Indexed: 01/21/2023] Open
Abstract
The isothiourea-catalyzed enantioselective 1,6-conjugate addition of para-nitrophenyl esters to 2,6-disubstituted para-quinone methides is reported. para-Nitrophenoxide, generated in situ from initial N-acylation of the isothiourea by the para-nitrophenyl ester, is proposed to facilitate catalyst turnover in this transformation. A range of para-nitrophenyl ester products can be isolated, or derivatized in situ by addition of benzylamine to give amides at up to 99% yield. Although low diastereocontrol is observed, the diastereoisomeric ester products are separable and formed with high enantiocontrol (up to 94:6 er).
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Affiliation(s)
- Jude N. Arokianathar
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK; (J.N.A.); (W.C.H.); (C.M.); (M.D.G.); (A.M.Z.S.)
| | - Will C. Hartley
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK; (J.N.A.); (W.C.H.); (C.M.); (M.D.G.); (A.M.Z.S.)
| | - Calum McLaughlin
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK; (J.N.A.); (W.C.H.); (C.M.); (M.D.G.); (A.M.Z.S.)
| | - Mark D. Greenhalgh
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK; (J.N.A.); (W.C.H.); (C.M.); (M.D.G.); (A.M.Z.S.)
- Department of Chemistry, University of Warwick, Coventry CV4 7AL, UK
| | - Darren Stead
- AstraZeneca, Oncology R&D, Research & Early Development, Darwin Building, 310, Cambridge Science Park, Milton Road, Cambridge CB4 0WG, UK;
| | - Sean Ng
- Syngenta, Jealott’s Hill International Research Centre, Bracknell RG42 6EY, UK;
| | - Alexandra M. Z. Slawin
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK; (J.N.A.); (W.C.H.); (C.M.); (M.D.G.); (A.M.Z.S.)
| | - Andrew D. Smith
- EaStCHEM, School of Chemistry, University of St Andrews, North Haugh, St Andrews KY16 9ST, UK; (J.N.A.); (W.C.H.); (C.M.); (M.D.G.); (A.M.Z.S.)
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14
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Singh G, Pandey R, Pankhade YA, Fatma S, Anand RV. Construction of Oxygen- and Nitrogen-based Heterocycles from p-Quinone Methides. CHEM REC 2021; 21:4150-4173. [PMID: 34369640 DOI: 10.1002/tcr.202100137] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 06/25/2021] [Accepted: 06/28/2021] [Indexed: 01/08/2023]
Abstract
In the last few years, there has been an explosive growth in the area of para-quinone methide (p-QM) chemistry. This boom is actually due to the unique reactivity pattern of p-QMs, and also their remarkable synthetic applications. In fact, p-QMs serve as synthons for unsymmetrical diaryl- and triarylmethanes, and also for the construction of diverse range of carbocycles and heterocycles. In the last few years, a wide range of structurally complex heterocyclic frameworks could be accessed through the synthetic transformations of structurally modified stable p-QMs. Therefore, the main focus of this review article is to cover the recent advancements in the transition-metal, Lewis acid and base-catalyzed/mediated synthetic transformations of the stable p-quinone methides (p-QMs) to oxygen- and nitrogen-containing heterocycles.
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Affiliation(s)
- Gurdeep Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, SAS Nagar, Manauli (PO), Punjab, 140306
| | - Rajat Pandey
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, SAS Nagar, Manauli (PO), Punjab, 140306
| | - Yogesh A Pankhade
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, SAS Nagar, Manauli (PO), Punjab, 140306
| | - Shaheen Fatma
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, SAS Nagar, Manauli (PO), Punjab, 140306
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, SAS Nagar, Manauli (PO), Punjab, 140306
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15
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Shyam A, Pradhan AK, Mondal P. A Density Functional Theory Study on Et-BAC-Catalyzed 1,6-Conjugate Addition of p-Chlorobenzaldehyde to p-Quinone Methide for the Synthesis of α,α '-Diarylated Ketones. J Org Chem 2021; 86:9040-9054. [PMID: 34126745 DOI: 10.1021/acs.joc.1c01014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Umpolung-based organocatalysis has made a remarkable breakthrough in the field of synthetic organic chemistry. Among a plethora of umpolung catalysts, bis(amino)cyclopropenylidenes (BACs) have emerged as efficient organocatalysts with potential applications in synthesizing numerous essential organic moieties. In this study, a plausible mechanism for bis(diethylamino)cyclopropenylidene (Et-BAC)-catalyzed synthesis of α,α'-diarylated ketones has been established using the density functional theory (DFT) method. The proposed catalytic cycle of the studied reaction initiates with the nucleophilic interaction of Et-BAC with p-chlorobenzaldehyde to form a zwitterionic intermediate, which is then transformed to a reactive Breslow intermediate. The Breslow intermediate further undergoes a chemoselective and stereoselective 1,6-conjugate addition reaction with p-quinone methide to form a new C-C bond connection. Finally, the generated adduct undergoes a proton shift reaction with the assistance of both 8-diazabicyclo(5.4.0)undec-7-ene (DBU) and protonated DBU to yield the desired product. Conceptual DFT-derived reactivity indices and frontier molecular orbital theory analysis have been successfully utilized to unravel the role of Et-BAC in this studied reaction. In addition to Et-BAC, DBU and protonated DBU also play a very important role in lowering the activation energy barrier of proton transfer steps. This investigation will help in the rational designing of simple nonheterocyclic carbene-mediated novel organic transformations.
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Affiliation(s)
- Abhijit Shyam
- Department of Chemistry, Assam University, Silchar 788011, Assam, India
| | - Amit K Pradhan
- Department of Chemistry, Assam University, Silchar 788011, Assam, India
| | - Paritosh Mondal
- Department of Chemistry, Assam University, Silchar 788011, Assam, India
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16
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Shyam A, Pradhan AK, Mondal P. A density functional theory investigation on bis(diethylamino)cyclopropenylidene catalyzed synthesis of 1,4‐bifunctional compounds. J PHYS ORG CHEM 2021. [DOI: 10.1002/poc.4219] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Abhijit Shyam
- Department of Chemistry Assam University Silchar India
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17
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Ranga PK, Ahmad F, Nager P, Rana PS, Vijaya Anand R. Bis(amino)cyclopropenium Ion as a Hydrogen-Bond Donor Catalyst for 1,6-Conjugate Addition Reactions. J Org Chem 2021; 86:4994-5010. [PMID: 33721500 DOI: 10.1021/acs.joc.0c02940] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The catalytic application of the bis(amino)cyclopropenium ion has been investigated in conjugate addition reactions. The hydrogen atom, which is attached to the cyclopropene ring of bis(amino)cyclopropenium salts, is moderately acidic and can potentially serve as a hydrogen-bond donor catalyst in some organic transformations. This hypothesis has been successfully realized in the 1,6-conjugate addition reactions of p-quinone methides with various nucleophiles such as indole, 2-naphthol, thiols, phenols, and so forth. The spectroscopic studies (NMR and UV-vis) as well as the deuterium isotope labeling studies clearly revealed that the hydrogen atom (C-H) that is present in the cyclopropene ring of the catalyst is indeed solely responsible for catalyzing these transformations. In addition, these studies also strongly indicate that the C-H hydrogen of the cyclopropene ring activates the carbonyl group of the p-quinone methide through hydrogen bonding.
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Affiliation(s)
- Pavit Kumar Ranga
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, Manauli (P.O.), S. A. S. Nagar, Punjab 140306, India
| | - Feroz Ahmad
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, Manauli (P.O.), S. A. S. Nagar, Punjab 140306, India
| | - Prashant Nager
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, Manauli (P.O.), S. A. S. Nagar, Punjab 140306, India
| | - Prabhat Singh Rana
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, Manauli (P.O.), S. A. S. Nagar, Punjab 140306, India
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, Manauli (P.O.), S. A. S. Nagar, Punjab 140306, India
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18
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Xiong B, Xu S, Liu Y, Tang KW, Wong WY. Metal-Free, Acid/Phosphine-Induced Regioselective Thiolation of p-Quinone Methides with Sodium Aryl/Alkyl Sulfinates. J Org Chem 2021; 86:1516-1527. [PMID: 33406835 DOI: 10.1021/acs.joc.0c02390] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A simple and efficient method for the regioselective thiolation of p-quinone methides with sodium aryl/alkyl sulfinates has been established using an acid/phosphine-induced radical route under transition-metal-free conditions. A broad range of sodium aryl/alkyl sulfinates and p-quinone methides (p-QMs) are compatible for the reaction, giving the expected products with good to excellent yields. Control experiments were also performed to gain insights into the generation mechanism of thiyl radicals and hydrogen-atom transfer process. This protocol provides a safe and feasible way for the formation of carbon-sulfur bonds.
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Affiliation(s)
- Biquan Xiong
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China.,Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
| | - Shipan Xu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China
| | - Yu Liu
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China
| | - Ke-Wen Tang
- Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006, P. R. China
| | - Wai-Yeung Wong
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P. R. China
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19
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Rezazadeh Khalkhali M, Wilde MMD, Gravel M. Enantioselective Stetter Reactions Catalyzed by Bis(amino)cyclopropenylidenes: Important Role for Water as an Additive. Org Lett 2021; 23:155-159. [PMID: 33320678 DOI: 10.1021/acs.orglett.0c03879] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The first highly enantioselective intermolecular Stetter reaction using simple enones is reported. A series of novel chiral BAC structures were designed and prepared. They were tested in the Stetter reaction with simple aldehydes and enones. The products were generated in excellent yields and enantioselectivities (up to 94% ee). Surprisingly, a substoichiometric amount of water was crucial to obtain high enantioselectivities. Chiral BACs were also shown to catalyze 1,6-conjugate addition reactions with paraquinone methides enantioselectively.
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Affiliation(s)
| | - Myron M D Wilde
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
| | - Michel Gravel
- Department of Chemistry, University of Saskatchewan, 110 Science Place, Saskatoon, SK S7N 5C9, Canada
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20
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Guan R, Hsu C, Han J. Trifluoroethanol‐mediated Decarboxylative Addition Reactions of β‐Ketoacids with Diverse Electrophiles. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000553] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Ren‐You Guan
- Department of Chemistry National Chung Hsing University 145 Xingda Rd., South Dist. Taichung City 402 Taiwan R.O.C
| | - Chan‐Wei Hsu
- Department of Chemistry Chung Yuan Christian University 200 Chung Pei Road, Chung Li District Taoyuan City 32023 Taiwan R.O.C
| | - Jeng‐Liang Han
- Department of Chemistry National Chung Hsing University 145 Xingda Rd., South Dist. Taichung City 402 Taiwan R.O.C
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21
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Kumaran S, Prabhakaran M, Mariyammal N, Parthasarathy K. Catalyst-free 1,6-conjugate addition of indoles and 4-hydroxycoumarins to para-quinone methides: synthesis of unsymmetrical triarylmethanes. Org Biomol Chem 2020; 18:7837-7841. [PMID: 32996543 DOI: 10.1039/d0ob01789b] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The catalyst-free 1,6-conjugate addition of indoles and 4-hydroxycoumarins to para-quinone methides is reported. This protocol allowed us to access a range of unsymmetrical triarylmethanes in good to excellent yields. The outlined procedure is operationally simple, efficient, atom and step economical. The synthesized heterocyclic triarylmethanes were further converted into highly substituted indoloisoquinolines and pyranochromenones via metal-catalyzed C-H activation/annulation.
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Affiliation(s)
- Subramani Kumaran
- Department of Organic Chemistry, University of Madras, Guindy Campus, Tamil Nadu, Chennai 600025, India.
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22
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Kanchupalli V, Shukla RK, Singh A, Volla CMR. Rh(III)-Catalyzed Redox-Neutral Cascade Annulation of Benzamides with p
-Quinone Methides. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000863] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Vinaykumar Kanchupalli
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Mumbai Powai India
| | - Rahul K. Shukla
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Mumbai Powai India
| | - Anurag Singh
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Mumbai Powai India
| | - Chandra M. R. Volla
- Department of Chemistry; Indian Institute of Technology Bombay; 400076 Mumbai Powai India
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23
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Dai L, Mao K, Zhang G, Wang C, Liu Y, Rong L, Zhang J. Ru-Catalyzed δ-Arylation of para-Quninone Methides with Aryl Diazonium Salts to Synthesize Fuchsones. J Org Chem 2020; 85:7238-7246. [DOI: 10.1021/acs.joc.0c00621] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lei Dai
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Kaimin Mao
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Ge Zhang
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Chang Wang
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Yun Liu
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Liangce Rong
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, PR China
| | - Jinpeng Zhang
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Xuzhou 221004, Jiangsu, PR China
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24
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Yuan H, Kowah JA, Jiang J. Base-promoted hydrophosphination of para-quinone methides under ultrasonic irradiation: A rapid and efficient synthesis of diarylmethyl phosphorus oxides. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2020.151748] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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25
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Lima CGS, Pauli FP, Costa DCS, de Souza AS, Forezi LSM, Ferreira VF, de Carvalho da Silva F. para
-Quinone Methides as Acceptors in 1,6-Nucleophilic Conjugate Addition Reactions for the Synthesis of Structurally Diverse Molecules. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901796] [Citation(s) in RCA: 85] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Carolina G. S. Lima
- Departamento de Química Orgânica; Instituto de Química; Universidade Federal Fluminense; Campus do Valonguinho 24020-150 Niterói RJ Brazil
| | - Fernanda P. Pauli
- Departamento de Química Orgânica; Instituto de Química; Universidade Federal Fluminense; Campus do Valonguinho 24020-150 Niterói RJ Brazil
| | - Dora C. S. Costa
- Departamento de Química Orgânica; Instituto de Química; Universidade Federal Fluminense; Campus do Valonguinho 24020-150 Niterói RJ Brazil
| | - Acácio S. de Souza
- Departamento de Química Orgânica; Instituto de Química; Universidade Federal Fluminense; Campus do Valonguinho 24020-150 Niterói RJ Brazil
| | - Luana S. M. Forezi
- Departamento de Química Orgânica; Instituto de Química; Universidade Federal Fluminense; Campus do Valonguinho 24020-150 Niterói RJ Brazil
| | - Vitor F. Ferreira
- Departamento de Tecnologia Farmacêutica; Universidade Federal Fluminense; 24241-000 Niterói RJ Brazil
| | - Fernando de Carvalho da Silva
- Departamento de Química Orgânica; Instituto de Química; Universidade Federal Fluminense; Campus do Valonguinho 24020-150 Niterói RJ Brazil
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26
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Maripally N, Reddy VR, Donthi R, Mutyala R, Chandra R. DMAP catalyzed addition-cyclization reaction of 2-hydroxyphenyl-para-quinone methide with nitroalkenes: Facile entry into highly substituted chromane derivatives. Tetrahedron Lett 2020. [DOI: 10.1016/j.tetlet.2019.151554] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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27
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Roy S, Pradhan S, Kumar K, Chatterjee I. Asymmetric organocatalytic double 1,6-addition: rapid access to chiral chromans with molecular complexity. Org Chem Front 2020. [DOI: 10.1039/d0qo00354a] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have developed a highly δ-selective organocatalytic asymmetric double 1,6-addition protocol by tethering ortho-hydroxyphenyl substituted p-QMs onto the linear unbiased 2,4-dienals towards the formation of synthetically enriched chiral chromans.
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Affiliation(s)
- Sourav Roy
- Department of Chemistry
- Indian Institute of Technology Ropar
- Rupnagar
- India
| | - Suman Pradhan
- Department of Chemistry
- Indian Institute of Technology Ropar
- Rupnagar
- India
| | - Krishan Kumar
- Department of Chemistry
- Indian Institute of Technology Ropar
- Rupnagar
- India
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28
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Ghotekar GS, Shirsath SR, Shaikh AC, Muthukrishnan M. 1,6-Conjugate addition initiated formal [4+2] annulation of p-quinone methides with sulfonyl allenols: a unique access to spiro[5.5]undeca-1,4-dien-3-one scaffolds. Chem Commun (Camb) 2020; 56:5022-5025. [DOI: 10.1039/d0cc01005g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An expedient one-pot synthesis of carbocyclic spiro[5.5]undeca-1,4-dien-3-ones via 1,6-conjugate addition initiated formal [4+2] annulation sequences by employing p-quinone methides and sulfonyl allenols.
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Affiliation(s)
- Ganesh S. Ghotekar
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Sachin R. Shirsath
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Aslam C. Shaikh
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune 411008
- India
| | - M. Muthukrishnan
- Division of Organic Chemistry
- CSIR-National Chemical Laboratory
- Pune 411008
- India
- Academy of Scientific and Innovative Research (AcSIR)
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29
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Qi Y, Zhang F, Wang L, Feng A, Zhu R, Sun S, Li W, Liu L. δ-Cyano substituted para-quinone methides enable access to unsymmetric tri- and tetraarylmethanes containing all-carbon quaternary stereocenters. Org Biomol Chem 2020; 18:3522-3526. [DOI: 10.1039/d0ob00551g] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Placing an electron-withdrawing cyano group into the δ-position of para-quinone methides enables facile access to unsymmetrical tri- and tetraarylmethanes bearing all-carbon quaternary stereocenters.
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Affiliation(s)
- Yue Qi
- Department of Pharmaceutical Analysis
- School of Pharmacy
- Shandong University of Traditional Chinese Medicine
- Jinan 250355
- China
| | - Fang Zhang
- Department of pharmacy
- Jinan Central Hospital Affiliated to Shandong First Medical University
- Jinan 250013
- China
| | - Lin Wang
- Department of Pharmaceutical Analysis
- School of Pharmacy
- Shandong University of Traditional Chinese Medicine
- Jinan 250355
- China
| | - Aili Feng
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- China
| | - Rongxiu Zhu
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- China
| | - Shutao Sun
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- China
| | - Wei Li
- Department of Pharmaceutical Analysis
- School of Pharmacy
- Shandong University of Traditional Chinese Medicine
- Jinan 250355
- China
| | - Lei Liu
- School of Chemistry and Chemical Engineering
- Shandong University
- Jinan 250100
- China
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30
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Terashima K, Kawasaki-Takasuka T, Agou T, Kubota T, Yamazaki T. Syntheses of α-CF3-α-quaternary ketones via p-quinone methides and their derivatization to compounds with successively congested stereogenic centers. Org Biomol Chem 2020; 18:4638-4644. [DOI: 10.1039/d0ob00951b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
NHC-catalyzed 1,6-conjugate additions of a variety of aldehydes to δ-CF3-δ-substituted p-quinone methides and their highly diastereoselective derivatization to compounds with successively congested stereogenic centers were performed.
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Affiliation(s)
- Kyu Terashima
- Division of Applied Chemistry
- Institute of Engineering
- Tokyo University of Agriculture and Technology
- Koganei 184-8588
- Japan
| | - Tomoko Kawasaki-Takasuka
- Division of Applied Chemistry
- Institute of Engineering
- Tokyo University of Agriculture and Technology
- Koganei 184-8588
- Japan
| | - Tomohiro Agou
- Department of Biomolecular Functional Engineering
- Ibaraki University
- Hitachi 316-8511
- Japan
| | - Toshio Kubota
- Department of Biomolecular Functional Engineering
- Ibaraki University
- Hitachi 316-8511
- Japan
| | - Takashi Yamazaki
- Division of Applied Chemistry
- Institute of Engineering
- Tokyo University of Agriculture and Technology
- Koganei 184-8588
- Japan
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31
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Liou YC, Karanam P, Jang YJ, Lin W. Synthesis of Functionalized Benzofurans from para-Quinone Methides via Phospha-1,6-Addition/O-Acylation/Wittig Pathway. Org Lett 2019; 21:8008-8012. [DOI: 10.1021/acs.orglett.9b03001] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yan-Cheng Liou
- Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Tingchow Road, Taipei 11677, Taiwan, R.O.C
| | - Praneeth Karanam
- Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Tingchow Road, Taipei 11677, Taiwan, R.O.C
| | - Yeong-Jiunn Jang
- Chinese Medicine Research and Development Center, China Medical University Hospital, 2, Yuh-Der Road, Taichung 40447, Taiwan, R.O.C
| | - Wenwei Lin
- Department of Chemistry, National Taiwan Normal University, 88, Sec. 4, Tingchow Road, Taipei 11677, Taiwan, R.O.C
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32
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Liu Z, Xu H, Yao T, Zhang J, Liu L. Catalyst-Enabled Chemodivergent Construction of Alkynyl- and Vinyl-Substituted Diarylmethanes from p-Quinone Methides and Alkynes. Org Lett 2019; 21:7539-7543. [DOI: 10.1021/acs.orglett.9b02810] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhenli Liu
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, P.R. China
| | - Haofeng Xu
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, P.R. China
| | - Tengfei Yao
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, P.R. China
| | - Junliang Zhang
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, P.R. China
| | - Lu Liu
- School of Chemistry and Molecular Engineering, East China Normal University, 500 Dongchuan Road, Shanghai 200241, P.R. China
- Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development, East China Normal University, Shanghai 200062, P.R. China
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33
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Ghosh KG, Chandu P, Mondal S, Sureshkumar D. Visible-light mediated trifluoromethylation of p-quinone methides by 1,6-conjugate addition using pyrylium salt as organic photocatalyst. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.06.029] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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34
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Aher YN, Pawar AB. Catalyst- and reagent-free 1,6-hydrophosphonylation of p-quinone methides: a practical approach for the synthesis of diarylmethyl phosphine oxides. Org Biomol Chem 2019; 17:7536-7546. [PMID: 31369029 DOI: 10.1039/c9ob01326a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
We developed a catalyst-, reagent-, and additive-free protocol with 100% atom economy for the synthesis of diarylmethyl phosphine oxides via 1,6-hydrophosphonylation of p-quinone methides using water as a green solvent. The reaction showed broad scope with excellent functional group tolerance. The practicability of this method was demonstrated by carrying out the reaction on the gram scale whereby product was obtained in high yield by the filtration technique avoiding chromatographic purification.
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Affiliation(s)
- Yogesh N Aher
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India.
| | - Amit B Pawar
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India. and Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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35
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Yang GH, Zhao Q, Zhang ZP, Zheng HL, Chen L, Li X. Asymmetric Cycloaddition of ortho-Hydroxyphenyl-Substituted para-Quinone Methides and Enamides Catalyzed by Chiral Phosphoric Acid. J Org Chem 2019; 84:7883-7893. [DOI: 10.1021/acs.joc.9b00749] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Guo-Hui Yang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Qun Zhao
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Zhi-Pei Zhang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Han-Liang Zheng
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Li Chen
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xin Li
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
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36
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Xiong B, Wang G, Zhou C, Liu Y, Xu W, Xu WY, Yang CA, Tang KW. Base-Catalyzed Stereoselective 1,6-Conjugated Addition/Aromatization of P(O)-H Compounds with para
-Quinone Methides. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900419] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Biquan Xiong
- Department of Chemistry and Chemical Engineering; Hunan Institute of Science and Technology; 414006 Yueyang P.R.China
| | - Gang Wang
- Department of Chemistry and Chemical Engineering; Hunan Institute of Science and Technology; 414006 Yueyang P.R.China
| | - Congshan Zhou
- Department of Chemistry and Chemical Engineering; Hunan Institute of Science and Technology; 414006 Yueyang P.R.China
| | - Yu Liu
- Department of Chemistry and Chemical Engineering; Hunan Institute of Science and Technology; 414006 Yueyang P.R.China
| | - Weifeng Xu
- Department of Chemistry and Chemical Engineering; Hunan Institute of Science and Technology; 414006 Yueyang P.R.China
| | - Wen-Yuan Xu
- Department of Chemistry and Chemical Engineering; Hunan Institute of Science and Technology; 414006 Yueyang P.R.China
| | - Chang-An Yang
- Department of Chemistry and Chemical Engineering; Hunan Institute of Science and Technology; 414006 Yueyang P.R.China
| | - Ke-Wen Tang
- Department of Chemistry and Chemical Engineering; Hunan Institute of Science and Technology; 414006 Yueyang P.R.China
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37
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Zhang W, Yang C, Zhang ZP, Li X, Cheng JP. Visible-Light-Triggered Cyanoalkylation of para-Quinone Methides and Its Application to the Synthesis of GPR40 Agonists. Org Lett 2019; 21:4137-4142. [DOI: 10.1021/acs.orglett.9b01325] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei Zhang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Chen Yang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Zhi-Pei Zhang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Xin Li
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Jin-Pei Cheng
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
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38
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Yang B, Yao W, Xia XF, Wang D. Mn-Catalyzed 1,6-conjugate addition/aromatization of para-quinone methides. Org Biomol Chem 2019; 16:4547-4557. [PMID: 29873652 DOI: 10.1039/c8ob01057a] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of ferrocenyl triazole ligands have been synthesized and characterized, which proved to be effective for the Mn-catalyzed 1,6-conjugate addition/aromatization of para-quinone methides with good to high yields under mild conditions. This protocol provided an efficient and practical route to the synthetically interesting functionalized quinones, methines and their analogues.
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Affiliation(s)
- Bobin Yang
- Key Laboratory of Synthetic and Biological Colloids, Ministry of Education, School of Chemical and Material Engineering, Jiangnan University, Wuxi 214122, Jiangsu Province, China.
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39
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Sha Q, Liu H. De novo synthesis of benzofurans via trifluoroacetic acid catalyzed cyclization/oxidative aromatization cascade reaction of 2-hydroxy-1,4-diones. Org Biomol Chem 2019; 17:7547-7551. [DOI: 10.1039/c9ob01422e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A simple metal-free cyclization/oxidative aromatization reaction starting from 2-hydroxy-1,4-diones for the de novo synthesis of benzofurans was developed.
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Affiliation(s)
- Qiang Sha
- Jiangsu Key Laboratory of Pesticide Science and Department of Chemistry
- College of Sciences
- Nanjing Agricultural University
- Nanjing 210095
- P. R. China
| | - Haixuan Liu
- Sanhome R&D Centre
- Nanjing Sanhome Pharmaceutical Co
- Ltd
- Nanjing 211135
- P. R. China
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40
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Bhagat S, Arfeen M, Das G, Patel N, Bharatam PV. Electronic and ligating properties of carbocyclic carbenes: A theoretical investigation. J Comput Chem 2018; 40:726-733. [PMID: 30549074 DOI: 10.1002/jcc.25756] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2018] [Revised: 10/27/2018] [Accepted: 11/01/2018] [Indexed: 11/05/2022]
Abstract
Carbocyclic carbenes (CCCs) are a class of nucleophilic carbenes which are very similar to N-heterocyclic carbenes (NHCs) in terms of their reactivity, but they do not contain a stabilizing heteroatom in their cyclic ring system. In this study, 17 representative known CCCs and 34 newly designed CCCs are evaluated using quantum chemical methods, and the results are compared in terms of their stability, nucleophilicity, and proton affinity (PA) parameters. The results are divided on the basis of ring size of the known and reported CCCs. The stability, nucleophilicity, PA, complexation energy, and bond strength-related parameters were estimated using M06/6-311++G(d,p) method. The results indicated that the CCCs known in the literature are strong σ-electron donating species and have considerable π-accepting properties. This study led to the design and identification of a few new CCCs with dimethylamine and diaminomethynyl substituents which can be singlet stable and are substantially nucleophilic. © 2018 Wiley Periodicals, Inc.
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Affiliation(s)
- Shweta Bhagat
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Mohali, Punjab, 160062, India
| | - Minhajul Arfeen
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Mohali, Punjab, 160062, India
| | - Gourav Das
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Mohali, Punjab, 160062, India
| | - Neha Patel
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Mohali, Punjab, 160062, India
| | - Prasad V Bharatam
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research (NIPER), S.A.S. Nagar, Mohali, Punjab, 160062, India
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41
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Hao YJ, Hu XS, Yu JS, Zhou F, Zhou Y, Zhou J. An efficient Fe(III)-catalyzed 1,6-conjugate addition of para-quinone methides with fluorinated silyl enol ethers toward β,β-diaryl α-fluorinated ketones. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.11.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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42
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Abstract
Oxazolium salts were successfully employed for the first time as organocatalysts for benzoin, Stetter, and redox esterification reactions. An N-mesityl oxazolium salt catalyzed homobenzoin reaction of aromatic, heteroaromatic, and aliphatic aldehydes delivered α-hydroxy ketones in high yields. This new type of catalyst proved remarkably effective for the Stetter reaction of challenging substrates such as β-alkyl-α,β-unsaturated ketones and electron-rich aromatic aldehydes in comparison to common thiazolium and triazolium salts.
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Affiliation(s)
| | - Michel Gravel
- Department of Chemistry , University of Saskatchewan , Saskatoon , SK Canada , S7N 5C9
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43
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Wang J, Pan X, Liu J, Zhao L, Zhi Y, Zhao K, Hu L. Diastereoselective Synthesis of Tetrahydroquinolines via [4 + 2] Annulation between in Situ Generated p-Quinone Methides and Nitroalkenes. Org Lett 2018; 20:5995-5998. [DOI: 10.1021/acs.orglett.8b02127] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Junwei Wang
- Jiangsu Key Laboratory for Functional Substances of Chinese Medicine, Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Xiang Pan
- Jiangsu Key Laboratory for Functional Substances of Chinese Medicine, Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Jian Liu
- Jiangsu Key Laboratory for Functional Substances of Chinese Medicine, Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Lin Zhao
- Jiangsu Key Laboratory for Functional Substances of Chinese Medicine, Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Ying Zhi
- Jiangsu Key Laboratory for Functional Substances of Chinese Medicine, Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Kun Zhao
- Jiangsu Key Laboratory for Functional Substances of Chinese Medicine, Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
| | - Lihong Hu
- Jiangsu Key Laboratory for Functional Substances of Chinese Medicine, Stake Key Laboratory Cultivation Base for TCM Quality and Efficacy, School of Pharmacy, Nanjing University of Chinese Medicine, Nanjing 210023, PR China
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44
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Shirsath SR, Shinde GH, Shaikh AC, Muthukrishnan M. Accessing α-Arylated Nitriles via BF3·OEt2 Catalyzed Cyanation of para-Quinone Methides Using tert-Butyl Isocyanide as a Cyanide Source. J Org Chem 2018; 83:12305-12314. [DOI: 10.1021/acs.joc.8b01926] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sachin R. Shirsath
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India
| | - Ganesh H. Shinde
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Pune 411008, India
| | - Aslam C. Shaikh
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Pune 411008, India
| | - M. Muthukrishnan
- Division of Organic Chemistry, CSIR-National Chemical Laboratory, Pune 411008, India
- Academy of Scientific and Innovative Research (AcSIR), New Delhi 110025, India
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45
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Jadhav AS, Pankhade YA, Hazra R, Anand RV. 1,6-Hydroolefination and Cascade Cyclization of p-Quinone Methides with Styrenes: Total Synthesis of (±)-Isopaucifloral F. J Org Chem 2018; 83:10107-10119. [DOI: 10.1021/acs.joc.8b01401] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Abhijeet S. Jadhav
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli (PO), Punjab − 140306, India
| | - Yogesh A. Pankhade
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli (PO), Punjab − 140306, India
| | - Raju Hazra
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli (PO), Punjab − 140306, India
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli (PO), Punjab − 140306, India
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46
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Singh G, Goswami P, Sharma S, Anand RV. A One-Pot Approach to 2,3-Diarylbenzo[b]furans through N-Heterocyclic Carbene-Catalyzed 1,6-Conjugate Addition Followed by Acid Mediated Dehydrative Annulation. J Org Chem 2018; 83:10546-10554. [DOI: 10.1021/acs.joc.8b01358] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Gurdeep Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli (PO), Punjab 140306, India
| | - Prithwish Goswami
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli (PO), Punjab 140306, India
| | - Sonam Sharma
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli (PO), Punjab 140306, India
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S. A. S. Nagar, Manauli (PO), Punjab 140306, India
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47
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Gupta AK, Ahamad S, Vaishanv NK, Kant R, Mohanan K. Base-mediated 1,6-conjugate addition of the Seyferth-Gilbert reagent to para-quinone methides. Org Biomol Chem 2018; 16:4623-4627. [PMID: 29876566 DOI: 10.1039/c8ob01017j] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A 1,6-conjugate addition reaction of the Seyferth-Gilbert reagent (SGR) to p-quinone methides is reported. This base-mediated protocol allows rapid access to diarylmethylated diazomethylphosphonates. The reaction proceeds under mild basic conditions, making it a practical approach for the synthesis of diarylmethylated diazomethylphosphonates with a broad substrate scope. Interestingly, the treatment of the conjugate adduct with a catalytic amount of rhodium acetate resulted in the 1,2-aryl migration of the rhodium carbenoid intermediate to generate the corresponding 1,2-diaryl alkenylphosphonates in excellent yields.
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Affiliation(s)
- Ashis Kumar Gupta
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India. and Academy of Scientific and Innovative Research, New Delhi, India
| | - Shakir Ahamad
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India. and Academy of Scientific and Innovative Research, New Delhi, India
| | - Narendra Kumar Vaishanv
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India.
| | - Ruchir Kant
- Molecular and Structural Biology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
| | - Kishor Mohanan
- Medicinal and Process Chemistry Division, CSIR-Central Drug Research Institute, Lucknow 226031, India. and Molecular and Structural Biology Division, CSIR-Central Drug Research Institute, Lucknow 226031, India
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48
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Liu Q, Li S, Chen XY, Rissanen K, Enders D. Asymmetric Synthesis of Spiro-oxindole-ε-lactones through N-Heterocyclic Carbene Catalysis. Org Lett 2018; 20:3622-3626. [DOI: 10.1021/acs.orglett.8b01400] [Citation(s) in RCA: 85] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qiang Liu
- Institute of Organic Chemistry, RWTH Aachen University, Aachen 52074, Germany
| | - Sun Li
- Institute of Organic Chemistry, RWTH Aachen University, Aachen 52074, Germany
| | - Xiang-Yu Chen
- Institute of Organic Chemistry, RWTH Aachen University, Aachen 52074, Germany
| | - Kari Rissanen
- Department of Chemistry, University of Jyväskylä, Jyväskylä 40014, Finland
| | - Dieter Enders
- Institute of Organic Chemistry, RWTH Aachen University, Aachen 52074, Germany
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49
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Jadhav AS, Pankhade YA, Vijaya Anand R. Exploring Gold Catalysis in a 1,6-Conjugate Addition/Domino Electrophilic Cyclization Cascade: Synthesis of Cyclohepta[b]indoles. J Org Chem 2018; 83:8615-8626. [DOI: 10.1021/acs.joc.8b00607] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Abhijeet S. Jadhav
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City,
Sector 81, S. A. S. Nagar, Manauli (PO), Punjab 140306, India
| | - Yogesh A. Pankhade
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City,
Sector 81, S. A. S. Nagar, Manauli (PO), Punjab 140306, India
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Knowledge City,
Sector 81, S. A. S. Nagar, Manauli (PO), Punjab 140306, India
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50
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Jadhav AS, Pankhade YA, Anand RV. Tandem One-Pot Approach To Access 1,2,3-Triazole-fused Isoindolines through Cu-Catalyzed 1,6-Conjugate Addition of Me3SiN3 to p-Quinone Methides followed by Intramolecular Click Cycloaddition. J Org Chem 2018; 83:8596-8606. [DOI: 10.1021/acs.joc.8b00573] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Abhijeet S. Jadhav
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge
City, Manauli (PO), S. A. S. Nagar, Mohali, Punjab 140306, India
| | - Yogesh A. Pankhade
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge
City, Manauli (PO), S. A. S. Nagar, Mohali, Punjab 140306, India
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge
City, Manauli (PO), S. A. S. Nagar, Mohali, Punjab 140306, India
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