1
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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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2
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Rajput D, Jan G, Karuppasamy M, Bhuvanesh N, Nagarajan S, Maheswari CU, Menéndez JC, Sridharan V. Rapid Assembly of Functionalized 2 H-Chromenes and 1,2-Dihydroquinolines via Microwave-Assisted Secondary Amine-Catalyzed Cascade Annulation of 2- O/ N-Propargylarylaldehydes with 2,6-Dialkylphenols. J Org Chem 2023; 88:11778-11792. [PMID: 37556760 DOI: 10.1021/acs.joc.3c01082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
An efficient, secondary amine-catalyzed cascade annulation of 2-O/N-propargylarylaldehydes with 2,6-dialkylphenols was established to access biologically relevant functionalized 2H-chromenes and 1,2-dihydroquinolines tethered with a synthetically useful p-quinone methide scaffold in high yields under microwave irradiation and conventional heating conditions. The microwave-assisted strategy was convenient, clean, rapid, and high yielding in which the reactions were completed in just 15 min, and the yields obtained were up to 95%. This highly atom-economical domino process constructed two new C-C double bonds and a six-membered O/N-heterocyclic ring in a single synthetic operation. Its mechanism process was rationalized as involving sequential iminium ion formation, nucleophilic addition, and intramolecular annulation steps. Furthermore, the synthesized 2H-chromene derivatives were transformed into valuable indeno[2,1-c]chromenes, 5H-indeno[2,1-c]quinolines, and oxireno[2,3-c]chromene via a palladium-catalyzed double C-H bond activation process and epoxidation, respectively.
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Affiliation(s)
- Diksha Rajput
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Gowsia Jan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Muthu Karuppasamy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A & M University, College Station, Texas 77843, United States
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal 506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - J Carlos Menéndez
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
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3
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Carbocation Catalysis in the Synthesis of Heterocyclic Compounds. Chem Heterocycl Compd (N Y) 2023. [DOI: 10.1007/s10593-023-03157-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/12/2023]
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4
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Dai L, Zhang Z, Zhu G, Liu Y, Liu X, Zhang J, Rong L. Fluorohydroxylation and Hydration Reactions of para-Quinone Methides Promoted by Selectfluor. J Org Chem 2023; 88:1352-1363. [PMID: 36695008 DOI: 10.1021/acs.joc.2c02069] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Selectfluor-promoted vicinal fluorohydroxylation and hydration reaction of para-quinone methides (p-QMs) were described, affording vicinal fluorohydrins and ketone/ether products in high yields. The hydration products were highly controlled by the electronic properties of substituents in the aromatic ring, and simultaneously, the amount of Selectfluor was completely different during the synthesis of ketone/ether products. This reaction also represents the first fluorohydroxylation of p-QMs, and the wide range of p-QMs makes the vicinal fluorohydroxylation of great significance.
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Affiliation(s)
- Lei Dai
- Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Zhou Zhang
- Department of Chemical Engineering &Technology, China University of Mining and Technology, Xuzhou, Jiangsu 221116, P. R. China
| | - Guangzhou Zhu
- Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Yun Liu
- Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Xiaoqin Liu
- Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
| | - Jinpeng Zhang
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Xuzhou, Jiangsu 221004, P. R. China
| | - Liangce Rong
- Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, P. R. China
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5
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Biswas S, Bania N, Chandra Pan S. Recent Developments in Intermolecular Cross-Rauhut-Currier Reactions. CHEM REC 2023:e202200257. [PMID: 36703563 DOI: 10.1002/tcr.202200257] [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: 11/19/2022] [Revised: 01/04/2023] [Indexed: 01/28/2023]
Abstract
Intermolecular cross Rauhut-Currier reactions have gained much importance in recent years. It has proved its importance through procedures involving various catalysts and resulting in complex structures with good regio- as well as stereo- selectivity. This review highlights the recent developments of these reactions, published in current years, involving both achiral and chiral catalysts to give products, having various utilities. In addition, the detailed mechanistic studies of the above-mentioned reactions are also presented.
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Affiliation(s)
- Subhankar Biswas
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam, India, 781039
| | - Nimisha Bania
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam, India, 781039
| | - Subhas Chandra Pan
- Department of Chemistry, Indian Institute of Technology Guwahati, Assam, India, 781039
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6
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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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7
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Xiao W, Wu J. Recent advance in carbocation-catalyzed reactions. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.06.060] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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8
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Sharma D, Chatterjee R, Dhayalan V, Dandela R. Recent Advances in Enantioselective Organocatalytic Reactions Enabled by NHCs Containing Triazolium Motifs. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1856-5688] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
N-Heterocyclic carbenes (NHCs) containing triazolium motifs have emerged as a powerful tool in organocatalysis. Recently, various NHC pre-catalyst mediated organic transformations have been developed successfully. This article aims to compile the current state of knowledge on NHC-triazolium catalysed enantioselective name reactions and introduce newly developed catalytic methods. Furthermore, this review article framework provides an excellent opportunity to highlight some of the unique applications of these catalytic procedures in the natural product synthesis of biologically active compounds, notably the wide range of preparation of substituted chiral alcohols, and their derivatives. This article provides an overview of chiral NHC triazolium-catalyst libraries synthesis and their catalytic application in enantioselective reactions.
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Affiliation(s)
- Deepika Sharma
- Dept. of Industrial and Engineering Chemistry, Institute of Chemical Technology, Indian oil Odisha Campus, Bhubaneswar-, Bhubaneswar, India
| | - Rana Chatterjee
- Chemistry, Institute of Chemical Technology, Indian oil Odisha Campus, Bhubaneswar, Bhubaneswar, India
| | | | - Rambabu Dandela
- Dept. of Industrial and Engineering Chemistry, Institute of Chemical Technology- IOC Bhubaneswar, Bhubaneswar, India
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9
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Singh S, Mahato R, Sharma P, Yadav N, Vodnala N, Kumar Hazra C. Development of Transition-Metal-Free Lewis Acid-Initiated Double Arylation of Aldehyde: A Facile Approach Towards the Total Synthesis of Anti-Breast-Cancer Agent. Chemistry 2022; 28:e202104545. [PMID: 35060647 DOI: 10.1002/chem.202104545] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Indexed: 12/21/2022]
Abstract
This work describes a mild and robust double hydroarylation strategy for the synthesis of symmetrical /unsymmetrical diaryl- and triarylmethanes in excellent yields using Lambert salt (0.2-1.0 mol%). Despite the anticipated challenges associated with controlling selective product formation, unsymmetrical diaryl- and triarylmethanes products are obtained unprecedentedly. A highly efficient gram scale reaction has also been reported (TON for symmetrical product=475 and for unsymmetrical product=390). The synthetic utility of the methodology is demonstrated by the preparation of several unexplored diaryl- and triarylmethane-based biologically relevant molecules, such as arundine, vibrindole A, turbomycin B, and certain anti-inflammatory agents. A total synthesis of an anti-breast-cancer agent is also demonstrated. Control experiments, Hammett analysis, HRMS and GC-MS studies reveal the reaction intermediates and reaction mechanism.
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Affiliation(s)
- Sanjay Singh
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Rina Mahato
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Pragya Sharma
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Naveen Yadav
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Nagaraju Vodnala
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Chinmoy Kumar Hazra
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
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10
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Roy D, Kaul G, Akhir A, Sharma AK, Saha S, Chopra S, Panda G. Discovery and Biological Evaluation of Novel Diarylmethyl Amines Active against Drug Resistant
S. aureus
and
Enterococcus. ChemistrySelect 2022. [DOI: 10.1002/slct.202103904] [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)
- Deblina Roy
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension Sitapur Road Lucknow 226031 India
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 UP India
| | - Grace Kaul
- Division of Microbiology CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension Sitapur Road Lucknow 226031 India
- Academy of Scientific and Innovative Research New Delhi 110001 India
| | - Abdul Akhir
- Division of Microbiology CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension Sitapur Road Lucknow 226031 India
| | - Ashok Kumar Sharma
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension Sitapur Road Lucknow 226031 India
| | - Satyen Saha
- Department of Chemistry Institute of Science Banaras Hindu University Varanasi 221005 UP India
| | - Sidharth Chopra
- Division of Microbiology CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension Sitapur Road Lucknow 226031 India
- Academy of Scientific and Innovative Research New Delhi 110001 India
| | - Gautam Panda
- Medicinal and Process Chemistry Division CSIR-Central Drug Research Institute, Sector 10, Jankipuram Extension Sitapur Road Lucknow 226031 India
- Academy of Scientific and Innovative Research New Delhi 110001 India
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11
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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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12
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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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13
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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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14
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Yang M, Han H, Jiang H, Ye S, Fan X, Wu J. Photoinduced reaction of potassium alkyltrifluoroborates, sulfur dioxide and para-quinone methides via radical 1,6-addition. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2021.05.007] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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15
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Enantioselective 1,6‐Conjugate Addition of Dialkyl α‐Diazo Methylphosphonate to
para
‐Quinone Methides. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100881] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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16
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Wu G, Li T, Liu F, Zhao Y, Ma S, Tang S, Xie X, She X. Thiourea catalyzed 1,6-conjugate addition of indoles to para-quinone methides. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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17
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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: 28] [Impact Index Per Article: 9.3] [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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18
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Dai L, Yu Q, Zhang J, Wu F, Wang C, Zhang J, Rong L. Electrochemical Radical δ-H Sulfonylation Reaction for the Synthesis of 4-((Aryl,Arylsul fonyl)methylene)-2,5-Cyclohexadiene Derivatives. J Org Chem 2021; 86:10568-10579. [PMID: 34291953 DOI: 10.1021/acs.joc.1c01213] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A novel and efficient electrochemical radical δ-H sulfonylation reaction of para-quinone methides (p-QMs) and sodium sulfinates has been achieved under common laboratory conditions. In this strategy, a new C(sp2)-S bond was constructed for the synthesis of 4-((aryl,arylsulfonyl)methylene)-2,5-cyclohexadiene derivatives with a broad substrate scope, good functional group tolerance, and mild conditions. Further studies showed that the reaction had an excellent regional selectivity.
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Affiliation(s)
- Lei Dai
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China
| | - Qiuyu Yu
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China
| | - Jinghang Zhang
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China
| | - Fan Wu
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China
| | - Chang Wang
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China
| | - Jinpeng Zhang
- Key Lab of Environment and Health, School of Public Health, Xuzhou Medical University, Xuzhou, Jiangsu 221004, People's Republic of China
| | - Liangce Rong
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, Jiangsu 221116, People's Republic of China
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19
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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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20
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Borodkin GI, Elanov IR, Shubin VG. Carbocation Catalysis of Organic Reactions. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2021. [DOI: 10.1134/s1070428021030015] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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21
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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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22
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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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23
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Liang S, Jiang B, Xiao B, Chen Z, Du. W, Chen Y. Phosphine Catalyzed Enantioselective Cascade Reaction Initiated by Intermolecular Cross Rauhut‐Currier Reaction of Electron‐Deficient
ortho
‐Formyl Styrenes. ChemCatChem 2020. [DOI: 10.1002/cctc.202000910] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Shu‐Yuan Liang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 P. R. China
| | - Bo Jiang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 P. R. China
| | - Ben‐Xian Xiao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 P. R. China
| | - Zhi‐Chao Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 P. R. China
| | - Wei Du.
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 P. R. China
| | - Ying‐Chun Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology West China School of Pharmacy Sichuan University Chengdu 610041 P. R. China
- College of Pharmacy Third Military Medical University Shapingba Chongqing 400038 P. R. China
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24
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Dzieszkowski K, Barańska I, Mroczyńska K, Słotwiński M, Rafiński Z. Organocatalytic Name Reactions Enabled by NHCs. MATERIALS 2020; 13:ma13163574. [PMID: 32823580 PMCID: PMC7475904 DOI: 10.3390/ma13163574] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 08/07/2020] [Accepted: 08/09/2020] [Indexed: 12/20/2022]
Abstract
Giving reactions the names of their discoverers is an extraordinary tradition of organic chemistry. Nowadays, this phenomenon is much rarer, although already named historical reactions are still often developed. This is also true in the case of a broad branch of N-heterocyclic carbenes catalysis. NHCs allow many unique synthetic paths, including commonly known name reactions. This article aims to gather this extensive knowledge and compare historical reactions with current developed processes. Furthermore, this review is a great opportunity to highlight some of the unique applications of these procedures in the total synthesis of biologically active compounds. Hence, this concise article may also be a source of knowledge for scientists just starting their adventure with N-heterocyclic carbene chemistry.
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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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Roy D, Verma A, Banerjee A, Saha S, Panda G. Metal free highly efficient C–N bond formation through 1,6-addition: synthesis and photophysical studies of diaryl methyl amino acid esters (DMAAEs). NEW J CHEM 2020. [DOI: 10.1039/d0nj01587c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A transition-metal free, proficient strategy for the one-pot synthesis of diverse diaryl methyl amino acid esters (DMAAEs) has been established from the easily accessible chiral amino acid esters and para-quinone methides (QMs) in very good to excellent yields.
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Affiliation(s)
- Deblina Roy
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
| | - Abhineet Verma
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | - Arpita Banerjee
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
| | - Satyen Saha
- Department of Chemistry
- Institute of Science
- Banaras Hindu University
- Varanasi 221005
- India
| | - Gautam Panda
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
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27
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Wang JY, Hao WJ, Tu SJ, Jiang B. Recent developments in 1,6-addition reactions of para-quinone methides (p-QMs). Org Chem Front 2020. [DOI: 10.1039/d0qo00387e] [Citation(s) in RCA: 106] [Impact Index Per Article: 26.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In this review, we provide a comprehensive overview of recent progress in this rapidly growing field by summarizing the 1,6-conjugate addition and annulation reactions of p-QMs with consideration of their mechanisms and applications.
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Affiliation(s)
- Jia-Yin Wang
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Wen-Juan Hao
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Shu-Jiang Tu
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
| | - Bo Jiang
- School of Chemistry & Materials Science
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials
- Jiangsu Normal University
- Xuzhou 221116
- P. R. China
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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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Nan GM, Li X, Yao TY, Yan TX, Wen LR, Li M. InCl3-catalyzed 5-exo-dig cyclization/1,6-conjugate addition of N-propargylamides with p-QMs to construct oxazole derivatives. Org Biomol Chem 2020; 18:1780-1784. [DOI: 10.1039/c9ob02651g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
An InCl3-catalyzed tandem intramolecular 5-exo-dig cyclization/1,6-conjugate addition/aromatization of N-propargylamides with p-QMs to produce oxazoles tethering diarylmethane has been successfully developed.
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Affiliation(s)
- Guang-Ming Nan
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang
- Yili Normal University
- Yining 835000
- China
| | - Xue Li
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang
- Yili Normal University
- Yining 835000
- China
| | - Tian-Yu Yao
- State Key Laboratory Base of Eco-Chemical Engineering
- College of Chemistry and Molecular Engineering
- Qingdao University of Science & Technology
- Qingdao 266042
- China
| | - Ting-Xun Yan
- State Key Laboratory Base of Eco-Chemical Engineering
- College of Chemistry and Molecular Engineering
- Qingdao University of Science & Technology
- Qingdao 266042
- China
| | - Li-Rong Wen
- State Key Laboratory Base of Eco-Chemical Engineering
- College of Chemistry and Molecular Engineering
- Qingdao University of Science & Technology
- Qingdao 266042
- China
| | - Ming Li
- University and College Key Lab of Natural Product Chemistry and Application in Xinjiang
- Yili Normal University
- Yining 835000
- China
- State Key Laboratory Base of Eco-Chemical Engineering
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30
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Huchenski BSN, Christopherson CJ, Robertson KN, Speed AWH. Bis-aminocyclopropenylidene carbene borane catalyzed imine hydrogenation. Org Biomol Chem 2019; 17:6158-6164. [PMID: 31183491 DOI: 10.1039/c9ob01053j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Certain borenium cations supported by carbenes can function as hydrogenation catalysts for imines. While many carbenes have been explored, variation of the other groups on boron has been less common. We have investigated several carbene-borane adducts in an attempt to understand the ability of a bis-amino cyclopropenylidene (BAC) carbene dicyclohexylborane adduct to hydrogenate relatively sterically unhindered benzyl imines. As an additional variant, a BAC carbene adduct of diphenylborane was prepared. A convenient preparation of diphenylboron fluoride via a potassium fluoroborinate salt was employed in this chemistry. Reaction of diphenylboron fluoride with a BAC carbene afforded a modest yield of a carbene-fluoroborane adduct. Reaction between the fluoroborinate salt and a lithium tetrafluoroborate adduct of the carbene provided the adduct in much improved yield and cleanliness, and the product was structurally characterized. The fluoroborate could be converted to a boron hydride through fluoride-hydride exchange with dimethylchlorosilane. The boron hydride adduct was also structurally characterized. Unlike the BAC carbene dicyclohexylborane adduct, the BAC carbene diphenylborane adduct showed essentially no activity in hydrogenation of imines or enamines.
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Affiliation(s)
- Blake S N Huchenski
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, Halifax, NS B3H 4R2, Canada.
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31
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Singh G, Kumar S, Chowdhury A, Vijaya Anand R. Base-Mediated One-pot Synthesis of Oxygen-Based Heterocycles from 2-Hydroxyphenyl-Substituted para-Quinone Methides. J Org Chem 2019; 84:15978-15989. [DOI: 10.1021/acs.joc.9b02455] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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
| | - Suresh Kumar
- 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
| | - Arjun Chowdhury
- 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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32
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Paluru DK, Mahesh S, Ahmad F, Vijaya Anand R. A Cascade Synthesis of Hetero‐arylated Triarylmethanes Through a Double 5‐
endo
‐dig Cyclization Sequence. Chem Asian J 2019; 14:4688-4695. [DOI: 10.1002/asia.201900960] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Revised: 09/03/2019] [Indexed: 12/17/2022]
Affiliation(s)
- Dilip K. Paluru
- Department of Chemical SciencesIndian Institute of Science Education and Research (IISER) Mohali Sector 81, Knowledge City, S. A. S. Nagar, Manauli (PO) Punjab- 140306 India
| | - Sriram Mahesh
- Department of Chemical SciencesIndian 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 SciencesIndian 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 SciencesIndian 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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33
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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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34
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Zhou Z, He Q, Jiang Y, Ouyang Q, Du W, Chen YC. Double Thiol-Chiral Brønsted Base Catalysis: Asymmetric Cross Rauhut–Currier Reaction and Sequential [4 + 2] Annulation for Assembly of Different Activated Olefins. Org Lett 2019; 21:7184-7188. [PMID: 31448622 DOI: 10.1021/acs.orglett.9b02944] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhi Zhou
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Qing He
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Ying Jiang
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Qin Ouyang
- College of Pharmacy, Third Military Medical University, Shapingba, Chongqing 400038, China
| | - Wei Du
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
| | - Ying-Chun Chen
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Ministry of Education and Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China
- College of Pharmacy, Third Military Medical University, Shapingba, Chongqing 400038, China
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35
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Bae S, Zhang C, Gillard RM, Lupton DW. Enantioselective N‐Heterocyclic Carbene Catalyzed Bis(enoate) Rauhut–Currier Reaction. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Song Bae
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Changhe Zhang
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Rachel M. Gillard
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - David W. Lupton
- School of Chemistry Monash University Clayton 3800 Victoria Australia
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36
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Bae S, Zhang C, Gillard RM, Lupton DW. Enantioselective N‐Heterocyclic Carbene Catalyzed Bis(enoate) Rauhut–Currier Reaction. Angew Chem Int Ed Engl 2019; 58:13370-13374. [DOI: 10.1002/anie.201907111] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2019] [Revised: 07/15/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Song Bae
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Changhe Zhang
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - Rachel M. Gillard
- School of Chemistry Monash University Clayton 3800 Victoria Australia
| | - David W. Lupton
- School of Chemistry Monash University Clayton 3800 Victoria Australia
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37
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Zhang B, Liu L, Mao S, Zhou MD, Wang H, Li L. Base-Catalyzed 1,6-Hydrophosphonylation of p
-Quinone Methides with Diphenylphosphane Oxide/Phosphites. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900606] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Bin Zhang
- School of Chemistry and Materials Science; Liaoning Shihua University; Dandong Road 1, Fushun 113001 P. R. China
| | - Lu Liu
- School of Chemistry and Materials Science; Liaoning Shihua University; Dandong Road 1, Fushun 113001 P. R. China
| | - Shukuan Mao
- School of Chemistry and Materials Science; Liaoning Shihua University; Dandong Road 1, Fushun 113001 P. R. China
| | - Ming-Dong Zhou
- School of Chemistry and Materials Science; Liaoning Shihua University; Dandong Road 1, Fushun 113001 P. R. China
| | - He Wang
- School of Chemistry and Materials Science; Liaoning Shihua University; Dandong Road 1, Fushun 113001 P. R. China
| | - Lei Li
- School of Chemistry and Materials Science; Liaoning Shihua University; Dandong Road 1, Fushun 113001 P. R. China
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Deacylative 1,6-addition of Bestmann-Ohira reagent to p-quinone methides for the synthesis of α-diazo-β-diarylphosphonates and cis-stilbenyl phosphonates. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.02.055] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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1,6-Conjugate sulfonylation of para-quinone methides: An expedient approach to unsymmetrical gem-diarylmethyl sulfones. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2018.12.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Pandey R, Anand RV. Base-Catalyzed 1,6-Conjugate Addition of Nitroalkanes to p-Quinone Methides under Continuous Flow. ACS OMEGA 2018; 3:13967-13976. [PMID: 31458092 PMCID: PMC6644449 DOI: 10.1021/acsomega.8b01971] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 10/15/2018] [Indexed: 06/10/2023]
Abstract
A mild base-catalyzed protocol for the synthesis of substituted nitroalkane derivatives has been developed under continuous flow using a microreaction technique. This transformation basically involves the 1,6-conjugate addition of nitroalkanes to p-quinone methides, leading to the substituted nitroalkanes in good to excellent yields.
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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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42
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Vaishanv NK, Gupta AK, Kant R, Mohanan K. Fluoride-Mediated α-Selective 1,6-Conjugate Addition of Allenic Esters to p-Quinone Methides. J Org Chem 2018; 83:8759-8767. [DOI: 10.1021/acs.joc.8b01074] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
| | - Ashis Kumar Gupta
- Academy of Scientific and Innovative Research, New Delhi 110001, India
| | | | - Kishor Mohanan
- Academy of Scientific and Innovative Research, New Delhi 110001, India
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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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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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