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Sonavane S, Mokal S, Wadekar S, Wakchaure S, Deshmukh S. An efficient synthesis of 2-(4-(benzyloxy)phenyl)-N, N-dimethylacetamide substantially free from impurities – Synthesis & characterization of novel impurities. RESULTS IN CHEMISTRY 2021. [DOI: 10.1016/j.rechem.2021.100160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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2
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Wen J, Wei W, Xue S, Yang D, Lou Y, Gao C, Wang H. Metal-Free Oxidative Spirocyclization of Alkynes with Sulfonylhydrazides Leading to 3-Sulfonated Azaspiro[4,5]trienones. J Org Chem 2015; 80:4966-72. [PMID: 25928832 DOI: 10.1021/acs.joc.5b00361] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A novel and direct oxidative spirocyclization of arylpropiolamides with sulfonylhydrazides leading to 3-sulfonated azaspiro[4,5]trienones has been developed under metal-free conditions. The reaction is performed in a tandem manner constituted by the sequential sulfonylation of alkynes, ipso-carbocyclization, dearomatization, hydration, and oxidation processes, providing a convenient and efficient approach to various sulfonated azaspiro[4,5] trienones of biological importance.
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Affiliation(s)
- Jiangwei Wen
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China
| | - Wei Wei
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China
| | - Shengnan Xue
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China
| | - Daoshan Yang
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China
| | - Yu Lou
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China
| | - Chaoyang Gao
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China
| | - Hua Wang
- The Key Laboratory of Life-Organic Analysis and Key Laboratory of Pharmaceutical Intermediates and Analysis of Natural Medicine, School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu 273165, Shandong, China
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Yin Q, You SL. Intramolecular alkene electrophilic bromination initiated ipso-bromocyclization for the synthesis of functionalized azaspirocyclohexadienones. Org Lett 2012; 14:3526-9. [PMID: 22724508 DOI: 10.1021/ol301531z] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Intramolecular alkene electrophilic bromination initiated dearomative cyclization has been realized in the presence of DBDMH to provide functionalized azaspirocyclohexadienones in excellent yields under mild conditions.
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Affiliation(s)
- Qin Yin
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Lu, Shanghai 200032, China
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So M, Kotake T, Matsuura K, Inui M, Kamimura A. Concise Synthesis of 2-Benzazepine Derivatives and Their Biological Activity. J Org Chem 2012; 77:4017-28. [PMID: 22463127 DOI: 10.1021/jo300380z] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Masahiro So
- Department of Applied Molecular
Bioscience, Graduate School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Tomoko Kotake
- Department of Applied Molecular
Bioscience, Graduate School of Medicine, Yamaguchi University, Ube 755-8611, Japan
| | - Kenji Matsuura
- Department of Pharmacology,
Graduate School of Medicine, Yamaguchi University, Ube 755-8505, Japan
| | - Makoto Inui
- Department of Pharmacology,
Graduate School of Medicine, Yamaguchi University, Ube 755-8505, Japan
| | - Akio Kamimura
- Department of Applied Molecular
Bioscience, Graduate School of Medicine, Yamaguchi University, Ube 755-8611, Japan
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Efficient microwave-assisted synthesis of 4-amino-2-benzazepin-3-ones as conformationally restricted dipeptide mimetics. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.10.072] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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6
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Feytens D, De Vlaeminck M, Tourwé D. A novel solid phase approach to Aia-containing peptides. J Pept Sci 2008; 15:16-22. [DOI: 10.1002/psc.1081] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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7
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Lomlim L, Einsiedel J, Heinemann FW, Meyer K, Gmeiner P. Proline derived spirobarbiturates as highly effective beta-turn mimetics incorporating polar and functionalizable constraint elements. J Org Chem 2008; 73:3608-11. [PMID: 18363364 DOI: 10.1021/jo702573z] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A practical and efficient synthesis of spirobarbiturates of type III is reported when NH acidity of the imide function of the hydrophilic linker element allowed the introduction of different substituents. Structural characterization, which was based on both X-ray crystallography and spectroscopic investigations, indicated type II beta-turn formation. Introduction of the molecular scaffold into solid phase peptide synthesis gave rise to spirocyclic neuropeptide analogs.
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Affiliation(s)
- Luelak Lomlim
- Department of Chemistry and Pharmacy, Emil Fischer Center, Friedrich Alexander University, Schuhstrasse 19, D-91052 Erlangen, Germany
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Pandey J, Mishra M, Bisht SS, Sharma A, Tripathi RP. An efficient chemoselective etherification of phenols in polyfunctional aromatic compounds. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2007.11.129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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9
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Ballet S, De Wachter R, Maes BU, Tourwé D. Derivatization of 1-phenyl substituted 4-amino-2-benzazepin-3-ones: evaluation of Pd-catalyzed coupling reactions. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.02.084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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11
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12
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Synthesis of 4-amino-3-oxo-tetrahydroazepino[3,4-b]indoles: new conformationally constrained Trp analogs. Tetrahedron 2007. [DOI: 10.1016/j.tet.2006.11.069] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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13
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Bittermann H, Böckler F, Einsiedel J, Gmeiner P. A Highly Practical RCM Approach towards a Molecular Building Kit of Spirocyclic Reverse Turn Mimics. Chemistry 2006; 12:6315-22. [PMID: 16729342 DOI: 10.1002/chem.200600432] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The development of privileged molecular scaffolds efficiently mimicking reverse turn motifs and thus increasing both binding and selectivity and enabling the elucidation of the bioactive conformation of a natural peptide has attracted remarkable interest. The frequent occurrence of proline in various turn patterns initiated the design of proline-based reverse turn mimetics. As a structural hybridization of a highly potent type VI beta-turn inducer 1 with saturated spirocyclic lactams 3 efficiently mimicking type II beta turns, we developed a versatile synthetic route towards unsaturated spirocyclic lactams of type 2, when Seebach's self-reproduction of chirality methodology was combined with a peptide coupling reaction and Grubbs' ring-closing metathesis. By this means, a variety of model peptides with six- up to nine-membered lactam rings were accessible following a uniform pathway. Introduction of suitably protected templates into solid-phase peptide synthesis gave rise to unsaturated spirocyclic analogues of the naturally occurring neuropeptide neurotensin. Spectroscopic investigations as well as DFT calculations on a high level of theory revealed a remarkable dependence of the reverse-turn inducing potency on the ring size. While the secondary structure of the unsaturated spirocyclic epsilon-lactam 12 closely agrees with the reference gamma-lactam 3 a, the unsaturated delta-lactam 11 serves as an extraordinarily potent beta-turn inducer which is even superior to beta-lactams of type 3 b. The eight-membered unsaturated spirocyclic lactam 13 adopts a conformation almost ideally matching the prerequisites for a canonical type II beta turn with the highest stability of the whole series. In contrast, the nine-membered spirolactam 14 represents a scaffold with a high conformational flexibility.
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Affiliation(s)
- Holger Bittermann
- Department of Medicinal Chemistry, Friedrich Alexander University Erlangen-Nürnberg, Schuhstrasse 19, 91052 Erlangen, Germany
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Ballet S, Frycia A, Piron J, Chung NN, Schiller PW, Kosson P, Lipkowski AW, Tourwé D. Synthesis and biological evaluation of constrained analogues of the opioid peptide H-Tyr-D-Ala-Phe-Gly-NH2 using the 4-amino-2-benzazepin-3-one scaffold. ACTA ACUST UNITED AC 2006; 66:222-30. [PMID: 16218989 DOI: 10.1111/j.1399-3011.2005.00291.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The synthesis of conformationally restricted dipeptidic moieties 4-amino-1,2,4,5-tetrahydro-2-benzazepin-3-one (Aba)-Gly ([(4S)-amino-3-oxo-1,2,4,5-tetrahydro-1H-2-benzazepin-2-yl]-acetic acid) and 8-hydroxy-4-amino-1,2,4,5-tetrahydro-2-benzazepin-3-one (Hba)-D-Ala ([(4S)-amino-8-hydroxy-3-oxo-1,2,4,5-tetrahydro-benzo[c]azepin-2-yl]-propionic acid) was based on a synthetic strategy that uses an oxazolidinone as an N-acyliminium precursor. Introducing these Aba scaffolds into the N-terminal tetrapeptide of dermorphin (H-Tyr-D-Ala-Phe-Gly-Tyr-Pro-Ser-NH2)-induced remarkable shifts in affinity and selectivity towards the opioid mu- and delta-receptors. This paper provides the synthesis and biological in vitro and in vivo evaluation of constricted analogues of the N-terminal tetrapeptide H-Tyr-D-Ala-Phe-Gly-NH2, which is the minimal subunit of dermorphin needed for dermorphin-like opiate activity.
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Affiliation(s)
- S Ballet
- Department of Organic Chemistry, Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium
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Bittermann H, Gmeiner P. Chirospecific Synthesis of Spirocyclic β-Lactams and Their Characterization as Potent Type II β-Turn Inducing Peptide Mimetics. J Org Chem 2005; 71:97-102. [PMID: 16388623 DOI: 10.1021/jo0517287] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] Starting from natural proline, a practical chirospecific synthesis of spirocyclic beta-lactams of type 2 is described when a methylene moiety showing minimal steric demand is employed as a constraint element for adjusting the dihedral angle psi(i + 1). Employing the concept of self-reproduction of chirality, C-formylation of the oxazolidinone 5 afforded the key intermediate 7 taking advantage of an intermediate protection of the bridging element as a vinyl moiety. NMR- and IR-based conformational studies clearly indicated that spiro-beta-lactams of type 2 can serve as efficient beta-turn nucleators.
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Affiliation(s)
- Holger Bittermann
- Department of Medicinal Chemistry, Emil Fischer Center, Friedrich Alexander University, Schuhstrasse 19, D-91052 Erlangen, Germany
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Bittermann H, Einsiedel J, Hübner H, Gmeiner P. Evaluation of Lactam-Bridged Neurotensin Analogues Adjusting ψ(Pro10) Close to the Experimentally Derived Bioactive Conformation of NT(8−13). J Med Chem 2004; 47:5587-90. [PMID: 15481995 DOI: 10.1021/jm049644y] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The neurotensin C-terminal hexapeptide, NT(8-13), which has been found to adopt a beta-strand-like conformation while bound to the NT1 receptor, was modified by the introduction of conformational constraints. Synthesis of the four stereoisomeric 4.4-spirolactams 1-4 and subsequent NT1 receptor binding studies showed that the restriction of psi(Pro10) to approximately 130 degrees leads to a more than 1000-fold increase of binding affinity for 1 (Ki = 12 nM) when compared to the more flexible analogue [NMeTyr11]NT(8-13).
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Affiliation(s)
- Holger Bittermann
- Department of Medicinal Chemistry, Emil Fischer Center, Friedrich Alexander University, Schuhstrasse 19, D-91052 Erlangen, Germany
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Van Rompaey K, Van den Eynde I, De Kimpe N, Tourwé D. A versatile synthesis of 2-substituted 4-amino-1,2,4,5-tetrahydro-2-benzazepine-3-ones. Tetrahedron 2003. [DOI: 10.1016/s0040-4020(03)00583-0] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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18
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Casimir JR, Guichard G, Briand JP. Methyl 2-((succinimidooxy)carbonyl)benzoate (MSB): a new, efficient reagent for N-phthaloylation of amino acid and peptide derivatives. J Org Chem 2002; 67:3764-8. [PMID: 12027691 DOI: 10.1021/jo016347h] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A new, efficient, and readily available reagent, methyl 2-((succinimidooxy)carbonyl)benzoate (MSB), for N-phthaloylation of amino acids and amino acid derivatives is described. The phthaloylation procedure is simple and racemization-free and gives excellent results with alpha-amino acids, alpha-amino alcohols, dipeptides, alpha-amino carboxamides, and alpha-amino esters.
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Affiliation(s)
- J Richard Casimir
- Laboratoire d'Immunologie et Chimie Thérapeutique, UPR 9021 CNRS, IBMC, 15 rue René Descartes, F-67084 Strasbourg Cedex, France.
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Ruzza P, Calderan A, Osler A, Elardo S, Borin G. Synthesis of a conformationally constrained tyrosine–glycine dipeptide mimetic: design of a potential substrate of Syk kinase. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00635-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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20
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Richard Casimir J, Guichard G, Briand JP. Efficient synthesis of phthaloyl derivatives of α-amino carboxamides. ACTA ACUST UNITED AC 2001. [DOI: 10.1007/bf02443609] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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