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Zhang X, Wang X, Jiao C, Zhao J, Liu X, Zhang G. Transition-metal-free, mild and efficient ring expansion of amino acid derivatives: facile access to densely functionalized azepines. Org Chem Front 2022. [DOI: 10.1039/d2qo01147f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mild, practical and efficient approach for the synthesis of valuable azepine products was achieved by the ring expansion of easily accessible amino acid derivatives.
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Affiliation(s)
- Xingjie Zhang
- Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, NMPA Key Laboratory for Research and Evaluation of Innovative Drug, School of Chemistry and Chemical Engineering, Henan Normal University (HNU), 46 East of Construction Road, Xinxiang, Henan 453007, China
| | - Xue Wang
- Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, NMPA Key Laboratory for Research and Evaluation of Innovative Drug, School of Chemistry and Chemical Engineering, Henan Normal University (HNU), 46 East of Construction Road, Xinxiang, Henan 453007, China
| | - Chenchen Jiao
- Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, NMPA Key Laboratory for Research and Evaluation of Innovative Drug, School of Chemistry and Chemical Engineering, Henan Normal University (HNU), 46 East of Construction Road, Xinxiang, Henan 453007, China
| | - Jie Zhao
- Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, NMPA Key Laboratory for Research and Evaluation of Innovative Drug, School of Chemistry and Chemical Engineering, Henan Normal University (HNU), 46 East of Construction Road, Xinxiang, Henan 453007, China
| | - Xiaopan Liu
- Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, NMPA Key Laboratory for Research and Evaluation of Innovative Drug, School of Chemistry and Chemical Engineering, Henan Normal University (HNU), 46 East of Construction Road, Xinxiang, Henan 453007, China
| | - Guisheng Zhang
- Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Henan Key Laboratory of Organic Functional Molecules and Drug Innovation, NMPA Key Laboratory for Research and Evaluation of Innovative Drug, School of Chemistry and Chemical Engineering, Henan Normal University (HNU), 46 East of Construction Road, Xinxiang, Henan 453007, China
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Fournier R, Green AR, Greenberg A, Lee-Ruff E, Liebman JF, Rágyanszki A. Predicted Reversal in N-Methylazepine/N-Methyl-7-azanorcaradiene Equilibrium Upon Formation of Their N-Oxides. Molecules 2020; 25:E4767. [PMID: 33081412 PMCID: PMC7594072 DOI: 10.3390/molecules25204767] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 10/08/2020] [Accepted: 10/12/2020] [Indexed: 11/16/2022] Open
Abstract
Density functional calculations and up to five different basis sets have been applied to the exploration of the structural, enthalpy and free energy changes upon conversion of the azepine to the corresponding N-oxide. Although it is well known that azepines are typically much more stable than their 7-azanorcaradiene valence isomers, the stabilities are reversed for the corresponding N-oxides. Structural, thermochemical as well as nucleus-independent chemical shift (NICS) criteria are employed to probe the potential aromaticity, antiaromaticity and nonaromaticity of N-methylazepine, its 7-azanorcaradiene valence isomer. For the sake of comparison, analogous studies are performed on N-methylpyrrole and its N-oxide.
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Affiliation(s)
- René Fournier
- Department of Chemistry, York University, Keele Campus, Toronto, ON MJ3 1P3, Canada;
| | - Alexa R. Green
- Department of Chemistry, University of New Hampshire, Durham, NH 03824, USA;
| | - Arthur Greenberg
- Department of Chemistry, University of New Hampshire, Durham, NH 03824, USA;
| | - Edward Lee-Ruff
- Department of Chemistry, York University, Keele Campus, Toronto, ON MJ3 1P3, Canada;
| | - Joel F. Liebman
- Department of Chemistry and Biochemistry, University of Maryland Baltimore County, Baltimore, MD 21250, USA
| | - Anita Rágyanszki
- Department of Physics and Astronomy, York University, Keele Campus, Toronto, ON MJ3 1P3, Canada
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Pötzsch R, Voit B. Thermal and Photochemical Crosslinking of Hyperbranched Polyphenylene With Organic Azides. Macromol Rapid Commun 2012; 33:635-9. [DOI: 10.1002/marc.201100795] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2011] [Revised: 12/22/2011] [Indexed: 11/10/2022]
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