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Huang W, Rao X, Shi L, Yang B, Kuang B, Wu H, Ke S, Liu C. N-Arylation of Amino Acid Esters via an I 2-Mediated Metal-Free Multicomponent Benzannulation Strategy. J Org Chem 2023; 88:16649-16654. [PMID: 37967371 DOI: 10.1021/acs.joc.3c01907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2023]
Abstract
Herein, we present a novel method for the N-arylation of amino acid esters using α-bromoacetaldehyde acetal and acetoacetate via an I2-mediated metal-free benzannulation strategy, which disclosed the first synthetic application of N-arylation of amino acids using nonaromatic building blocks. The synthesized N-arylated amino acid derivatives were found to possess promising selective inhibition against human hepatocellular liver carcinoma cells, human melanoma cells, and human normal liver cells, with an IC50 value as low as 16.79 μg·mL-1.
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Affiliation(s)
- Wenbo Huang
- Hubei Three Gorges Laboratory, Yichang 443007, China
| | - Xiaofeng Rao
- Shenzhen Grubbs Institute, Southern University of Science and Technology, Shenzhen 518055, China
- Shenzhen Bay Laboratory, Shenzhen 518108, China
| | - Liqiao Shi
- Key Laboratory of Microbial Pesticides, Ministry of Agriculture and Rural Affairs, Hubei Biopesticide Engineering Research Centre, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
| | - Bing Yang
- Hubei Three Gorges Laboratory, Yichang 443007, China
| | - Buxiao Kuang
- Hubei Three Gorges Laboratory, Yichang 443007, China
| | - Hongqu Wu
- Key Laboratory of Microbial Pesticides, Ministry of Agriculture and Rural Affairs, Hubei Biopesticide Engineering Research Centre, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
| | - Shaoyong Ke
- Key Laboratory of Microbial Pesticides, Ministry of Agriculture and Rural Affairs, Hubei Biopesticide Engineering Research Centre, Hubei Academy of Agricultural Sciences, Wuhan 430064, China
| | - Changhui Liu
- School of Low-Carbon Energy and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China
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Wang K, Zhang Y, Cai LY, Song XQ, Wang C, Zhang JR, Pan YF, Zhao HW. Diastereoselective Cascade Cyclization of Diazoimides with Alkylidene Pyrazolones for Preparation of Pyrazole-Fused Oxa-Bridged Oxazocines. Molecules 2023; 28:7021. [PMID: 37894500 PMCID: PMC10609588 DOI: 10.3390/molecules28207021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2023] [Revised: 10/06/2023] [Accepted: 10/08/2023] [Indexed: 10/29/2023] Open
Abstract
Under the catalysis of Rh2(OAc)4 (10 mol%) and binapbisphosphine ligand (±)-L3 (20 mol%) in DCE at 80 °C, the cascade cyclization of diazoimides with alkylidenepyrazolones underwent stereoselectively (dr > 20:1), affording pyrazole-fused oxa-bridged oxazocines in reasonable chemical yields. The chemical structure and relative configuration of title products were firmly identified by X-ray diffraction analysis.
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Affiliation(s)
| | | | | | | | | | | | | | - Hong-Wu Zhao
- College of Life Science and Bio-Engineering, Beijing University of Technology, No.100 Pingleyuan, Chaoyang District, Beijing 100124, China; (K.W.); (Y.Z.); (L.-Y.C.); (X.-Q.S.); (C.W.); (J.-R.Z.); (Y.-F.P.)
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Kandimalla SR, Sabitha G. Diversity-Oriented Synthesis of Oxacyclic Spirooxindole Derivatives through Ring-Closing Enyne Metathesis and Intramolecular Pauson-Khand (2+2+1) Cyclization of Oxindole Enynes. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700511] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Satheeshkumar Reddy Kandimalla
- Natural Products Chemistry Division; CSIR - Indian Institute of Chemical Technology; Hyderabad 500007 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110 025 India
| | - Gowravaram Sabitha
- Natural Products Chemistry Division; CSIR - Indian Institute of Chemical Technology; Hyderabad 500007 India
- Academy of Scientific and Innovative Research (AcSIR); New Delhi 110 025 India
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Efficient preparation method of 4-hydroxybenzoic esters – Oxidation of substituted Hagemman’s ester. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.04.090] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Gokara M, Narayana VV, Sadarangani V, Chowdhury SR, Varkala S, Ramachary DB, Subramanyam R. Unravelling the binding mechanism and protein stability of human serum albumin while interacting with nefopam analogues: a biophysical and insilico approach. J Biomol Struct Dyn 2016; 35:2280-2292. [PMID: 27453381 DOI: 10.1080/07391102.2016.1216895] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
In this study, molecular binding affinity was investigated for Nefopam analogues (NFs), a functionalized benzoxazocine, with human serum albumin (HSA), a major transport protein in the blood. Its binding affinity and concomitant changes in its conformation, binding site and simulations were also studied. Fluorescence data revealed that the fluorescence quenching of HSA upon binding of NFs analogues is based on a static mechanism. The three analogues of NFs binding constants (KA) are in the order of NF3 > NF2 > NF1 with values of 1.53 ± .057 × 104, 2.16 ± .071 × 104 and 3.6 ± .102 × 105 M-1, respectively. Concurrently, thermodynamic parameters indicate that the binding process was spontaneous, and the complexes were stabilized mostly by hydrophobic interactions, except for NF2 has one hydrogen bond stabilizes it along with hydrophobic interactions. Circular dichroism (CD) studies revealed that there is a decrease in α-helix with an increase in β-sheets and random coils signifying partial unfolding of the protein upon binding of NFs, which might be due to the formation of NFs-HSA complexes. Further, molecular docking studies showed that NF1, NF2 and NF3 bound to subdomains IIIA, IB and IIA through hydrophobic interactions. However, NF1 have additionally formed a single hydrogen bond with LYS 413. Furthermore, molecular simulations unveiled that NFs binding was in support with the structural perturbation observed in CD, which is evident from the root mean square deviation and Rg fluctuations. We hope our insights will provide ample scope for engineering new drugs based on the resemblances with NFs for enhanced efficacy with HSA.
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Affiliation(s)
- Mahesh Gokara
- a Department of Biochemistry , School of Life Sciences, University of Hyderabad , Hyderabad 500046 , India
| | | | - Vineet Sadarangani
- a Department of Biochemistry , School of Life Sciences, University of Hyderabad , Hyderabad 500046 , India
| | - Shatabdi Roy Chowdhury
- a Department of Biochemistry , School of Life Sciences, University of Hyderabad , Hyderabad 500046 , India
| | - Sreelaxmi Varkala
- a Department of Biochemistry , School of Life Sciences, University of Hyderabad , Hyderabad 500046 , India
| | | | - Rajagopal Subramanyam
- c Department of Plant Sciences , School of Life Sciences, University of Hyderabad , Hyderabad 500046 , India
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Bailey TS, Bremner JB, Skelton BW, White AH. Synthesis and X-ray structural studies of a substituted 2,3,4,5-tetrahydro-1H-3-benzazonine and a 1,2,3,5-tetrahydro-4,3-benzoxazonine. Molecules 2014; 20:487-502. [PMID: 25558858 PMCID: PMC6272339 DOI: 10.3390/molecules20010487] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2014] [Accepted: 12/29/2014] [Indexed: 11/16/2022] Open
Abstract
Using a common 1-(1-phenylethenyl)-1,2,3,4-tetrahydroisoquinoline precursor to the required ylide or N-oxide intermediate, the Stevens [2,3] and analogous Meisenheimer [2,3] sigmatropic rearrangements have been applied to afford concise syntheses of phenyl -substituted representatives of each of the reduced 1H-3-benzazonine and 4,3-benzoxazonine systems, respectively. Single crystal X-ray structure determinations were employed to define the conformational characteristics for each ring type.
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Affiliation(s)
- Timothy S Bailey
- Department of Chemistry, University of Tasmania, Hobart, Tas. 7001, Australia.
| | - John B Bremner
- School of Chemistry, University of Wollongong, Wollongong, NSW 2522, Australia.
| | - Brian W Skelton
- School of Chemistry and Biochemistry M310, The University of Western Australia, Crawley, WA 6009, Australia.
| | - Allan H White
- School of Chemistry and Biochemistry M310, The University of Western Australia, Crawley, WA 6009, Australia.
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Bremner JB, Wu Z. Annulation of Eight- to Ten-Membered Oxaza Rings to the Benzo[b]thiophene System by Intramolecular Nucleophilic Displacement. Aust J Chem 2014. [DOI: 10.1071/ch14055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Concise synthetic routes to 2H-benzo[b]thieno[3,2-b][1,5]oxazocin-6(3H)-one, and the new benzo[b]thieno[3,2-b][1,5]oxazonin-7(2H)-one and 2H-benzo[b]thieno[3,2-b][1,5]oxazecin-8(3H)-one systems, have been developed based on intramolecular nucleophilic displacement in the key ring forming step.
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Ramachary DB, Reddy YV. Dienamine Catalysis: An Emerging Technology in Organic Synthesis. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101157] [Citation(s) in RCA: 214] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
| | - Y. Vijayendar Reddy
- School of Chemistry, University of Hyderabad, Hyderabad‐500 046, India, Fax: +91‐40‐23012460
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Kim SH, Lee HS, Park BR, Kim JN. Base-Mediated Aerobic Oxidation of Hagemann's Ester: Competitive Hydroxylation at C-1 and C-3 Positions. B KOREAN CHEM SOC 2011. [DOI: 10.5012/bkcs.2011.32.5.1725] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ramachary DB, Ramakumar K. Direct Organocatalytic Asymmetric Approach to Baylis-Hillman-Type Products Through a Push-Pull Dienamine Platform. European J Org Chem 2011. [DOI: 10.1002/ejoc.201100075] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Herndon JW. The chemistry of the carbon–transition metal double and triple bond: Annual survey covering the year 2009. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2010.07.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Ramachary DB, Jain S. Sequential one-pot combination of multi-component and multi-catalysis cascade reactions: an emerging technology in organic synthesis. Org Biomol Chem 2010; 9:1277-300. [PMID: 21120241 DOI: 10.1039/c0ob00611d] [Citation(s) in RCA: 219] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Creating sequential one-pot combinations of multi-component reactions (MCRs) and multi-catalysis cascade (MCC) reactions is a challenging task that has already emerged as a new technology in synthetic organic chemistry. Through one-pot sequential combination of MCRs/MCC reactions, the chemical products (fine chemicals, agrochemicals and pharmaceuticals) that add value to our lives can be produced with less waste and greater economic benefits. Within this Emerging Area, we describe our recent developments and designs for sequential one-pot MCRs/MCC reactions to facilitate their realization as biomimetics in organic chemistry.
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Ramachary DB, Ramakumar K, Bharanishashank A, Narayana VV. Sequential One-Pot Combination of Multireactions through Multicatalysis: A General Approach to Rapid Assembly of Functionalized Push−Pull Olefins, Phenols, and 2-Methyl-2H-chromenes. ACTA ACUST UNITED AC 2010; 12:855-76. [DOI: 10.1021/cc100104k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Kinthada Ramakumar
- School of Chemistry, University of Hyderabad, Central University (PO), Hyderabad 500 046, India
| | - Adluri Bharanishashank
- School of Chemistry, University of Hyderabad, Central University (PO), Hyderabad 500 046, India
| | - Vidadala V. Narayana
- School of Chemistry, University of Hyderabad, Central University (PO), Hyderabad 500 046, India
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Ramachary DB, Mondal R, Venkaiah C. Rapid two-step synthesis of drug-like polycyclic substances by sequential multi-catalysis cascade reactions. Org Biomol Chem 2010; 8:321-5. [DOI: 10.1039/b920152a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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