1
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Liu S, Zhang K, Meng Y, Xu J, Chen N. Aryne and CO 2-based formal [2 + 2 + 2] annulation to access tetrahydroisoquinoline-fused benzoxazinones. Org Biomol Chem 2023; 21:6892-6897. [PMID: 37581250 DOI: 10.1039/d3ob01147j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/16/2023]
Abstract
Tetrahydroisoquinoline and its fused polyheterocycles are prevalent structural motifs found in numerous natural products. In this study, we report a highly efficient and convergent synthetic approach for the construction of tetrahydroisoquinoline-fused polyheterocycles through a three-component formal [2 + 2 + 2] annulation process by combining 3,4-dihydroisoquinolines, CO2, and benzynes. Notably, electron-rich 3,4-dihydroisoquinolines and electron-deficient benzynes exhibit greater reactivity in this annulation. Moreover, this method benefits from the convergent synthesis and the utilization of carbon dioxide, providing a valuable strategy for the facile synthesis of tetrahydroisoquinoline-fused polyheterocycles, with potential applications in the discovery and development of novel organic molecules.
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Affiliation(s)
- Shiqi Liu
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
| | - Kun Zhang
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
| | - Yutong Meng
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
| | - Jiaxi Xu
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
| | - Ning Chen
- Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, P. R. China.
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2
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Ma N, Zhou L, Li Y, Wu H, Li S, Zhang G. Theoretical Insight into the Mechanism of Cu(I)-Catalyzed [2 + 2 + 1] Cycloaddition to β-Pyrrolinones: Azaheterocycle Formation and Assisted Dehydrogenation with Solvent MeNO 2. J Org Chem 2023. [PMID: 37467204 DOI: 10.1021/acs.joc.3c00727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
The construction of multisubstituted β-pyrrolinones from simple starting materials remains a great challenge. Recently, a novel Cu(I)-catalyzed [2 + 2 + 1] cycloaddition reaction was developed for rapid access to fully substituted β-pyrrolinones, which are difficult to synthesize through traditional methods as this approach may involve unusual C-nucleophilic addition of enamines and umpolung of imines. Elucidating the reaction mechanism may inspire the development of new methodologies via the unusual C-nucleophilic addition of enamines and imines. However, the reaction mechanism is still unclear because none of the intermediates was observed during the reaction process. In this work, we employed theoretical and computational chemistry to investigate the possible pathway. Finally, the calculated results indicate that ketene formed by the Wolff rearrangement of α-diazo-β-ketoester reacts with enamine formed by the addition of alkynes and amine, affording the five-membered azaheterocycle, and this process involves the formation of a six-membered ring intermediate and sequential isomerization, and the further dehydrogenation needs to be assisted with solvent MeNO2.
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Affiliation(s)
- Nana Ma
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education; NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Henan Normal University, Xinxiang, Henan, 453007, China
| | - Lanxin Zhou
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education; NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Henan Normal University, Xinxiang, Henan, 453007, China
| | - Yameng Li
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education; NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Henan Normal University, Xinxiang, Henan, 453007, China
| | - Hao Wu
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education; NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Henan Normal University, Xinxiang, Henan, 453007, China
| | - Shujun Li
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education; NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Henan Normal University, Xinxiang, Henan, 453007, China
| | - Guisheng Zhang
- School of Chemistry and Chemical Engineering, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education; NMPA Key Laboratory for Research and Evaluation of Innovative Drug, Henan Normal University, Xinxiang, Henan, 453007, China
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3
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Luo Y, Xu J. Annulation of Diaryl(aryl)phosphenes and Cyclic Imines to Access Benzo-δ-phospholactams. Org Lett 2020; 22:7780-7785. [DOI: 10.1021/acs.orglett.0c02346] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Yun Luo
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, College of Chemistry, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
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4
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Mohammad-Salim HA, Abdallah HH, Maiyelvaganan KR, Prakash M, Hochlaf M. Mechanistic study of the [2+2] cycloaddition reaction of cyclohexenone and its derivatives with vinyl acetate. Theor Chem Acc 2020. [DOI: 10.1007/s00214-019-2542-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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5
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Cui HL, Liu S, Jiang L. Catalyst-Free Synthesis of Novel Dimeric Tetrahydroisoquinoline Derivatives through [2+2+2] Annulation. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900873] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Hai-Lei Cui
- Laboratory of Asymmetric Synthesis; Chongqing University of Arts and Sciences; 319 Honghe Ave. Yongchuan Chongqing 402160 China
| | - Si Liu
- Laboratory of Asymmetric Synthesis; Chongqing University of Arts and Sciences; 319 Honghe Ave. Yongchuan Chongqing 402160 China
| | - Lu Jiang
- Laboratory of Asymmetric Synthesis; Chongqing University of Arts and Sciences; 319 Honghe Ave. Yongchuan Chongqing 402160 China
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6
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Bhaskararao B, Jindal G, Sunoj RB. Exploring the Mechanism and Stereoselectivity in Chiral Cinchona-Catalyzed Heterodimerization of Ketenes. J Org Chem 2017; 82:13449-13458. [DOI: 10.1021/acs.joc.7b02517] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Bangaru Bhaskararao
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai,
Mumbai 400076, India
| | - Garima Jindal
- Department
of Chemistry, University of Southern California, 3620 McClintock Avenue, Los Angeles, California 90089, United States
| | - Raghavan B. Sunoj
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai,
Mumbai 400076, India
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7
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Shainyan BA, Chipanina NN, Oznobikhina LP. Pathways of cycloaddition of carbodiimides to N -alkenylidenetriflamides: A theoretical study. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.04.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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8
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He W, Zhuang J, Yang Z, Xu J. Sterically controlled diastereoselectivity in thio-Staudinger cycloadditions of alkyl/alkenyl/aryl-substituted thioketenes. Org Biomol Chem 2017. [DOI: 10.1039/c7ob01214d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Diastereoselectivity in [2 + 2] cycloadditions of alkyl/alkenyl/arylthioketenes and imines, named as thio-Staudinger cycloaddition, was rationalized and verified.
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Affiliation(s)
- Wei He
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
| | - Junpeng Zhuang
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
| | - Zhanhui Yang
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
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9
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He W, Zhuang J, Du H, Yang Z, Xu J. Stereochemistry and mechanistic insights in the [2t + 2i + 2i] annulations of thioketenes and imines. Org Biomol Chem 2017; 15:9424-9432. [DOI: 10.1039/c7ob02212c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The mechanism and stereochemistry of [2t + 2i + 2i] annulations between one thioketene molecule and two imine molecules have been studied experimentally and theoretically.
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Affiliation(s)
- Wei He
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
| | - Junpeng Zhuang
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
| | - Hongguang Du
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
| | - Zhanhui Yang
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
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10
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Yang Z, He W, Cheng B, Xu J. Stereochemistry and Mechanistic Insight in the [2(k)+2(i)+2(i)] Annulations of Ketenes and Imines. J Org Chem 2016; 81:4506-15. [PMID: 27166848 DOI: 10.1021/acs.joc.6b00279] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The stereochemistry and mechanistic insight in the annulations of one ketene molecule with two imine molecules ([2(k)+2(i)+2(i)] annulation) are studied by using six-membered 3,4-dihydroisoquinoline as an imine probe. A concerted hetero-Diels-Alder cycloaddition mechanism is proposed to explain the stereochemical outcomes. In most cases, the zwitterionic 2-aza-1,3-butadiene-type intermediates, generated from ketenes and imines, undergo endo hetero-Diels-Alder cycloaddition with the second imine molecule. For ketenes with electron-donating substituents, (2,4)-cis-(4,5)-cis-[2(k)+2(i)+2(i)] annuladducts formed stereospecifically, while, for ketenes with electron-accepting substituents, (2,4)-cis-(4,5)-trans-[2(k)+2(i)+2(i)] annuladducts are generated stereospecifically. The [2(k)+2(i)+2(i)] annulations of aryloxyketenes and 3,4-dihydroisoquinoline give stereodivergent products due to the occurrence of the stepwise nucleophilic annulation. However, in the [2(k)+2(i)+2(i)] annulations of seven-membered cyclic imine dibenzo[b,f][1,4]oxazepine, the zwitterionic aza-butadiene-type intermediates exclusively undergo exo hetero-Diels-Alder cycloadditions with another molecule of imine to yield (2,4)-trans-(4,5)-trans-[2(k)+2(i)+2(i)] annuladducts stereospecifically, regardless of the ketene substituents. The mechanistic model not only discloses the nature of the [2(k)+2(i)+2(i)] annulations, but also can be used to explain and predict the stereochemistry of the [2(k)+2(i)+2(i)] annuladducts from different ketenes and imines.
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Affiliation(s)
- Zhanhui Yang
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| | - Wei He
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| | - Baoxiang Cheng
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering, Department of Organic Chemistry, Faculty of Science, Beijing University of Chemical Technology , Beijing 100029, People's Republic of China
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11
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Heravi MM, Talaei B. Ketenes as Privileged Synthons in the Synthesis of Heterocyclic Compounds Part 3. ADVANCES IN HETEROCYCLIC CHEMISTRY 2016. [DOI: 10.1016/bs.aihch.2015.10.007] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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12
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Wu Q, Yang Z, Xu J. Temperature-dependent annuloselectivity and stereochemistry in the reactions of methanesulfonyl sulfene with imines. Org Biomol Chem 2016; 14:7258-67. [DOI: 10.1039/c6ob01259k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The annuloselectivity in the reactions of methanesulfonyl sulfene and imines varies with temperature. At 20 °C, the [2s+ 2i] annulation occurs exclusively, while at −78 °C, the [2s+ 2i+ 2i] annulation ofN-methyl imines takes place specifically.
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Affiliation(s)
- Qiuyue Wu
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
| | - Zhanhui Yang
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029
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13
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Li X, Jin X, Xu J. Annuloselectivity in Reactions of Diacyl Dichlorides and Imines: Combined Experimental and Theoretical Studies. J Org Chem 2015; 80:6976-85. [DOI: 10.1021/acs.joc.5b00573] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xinyao Li
- State Key Laboratory of Chemical
Resource Engineering, Department of Organic Chemistry, Faculty of
Science, Beijing University of Chemical Technology, 100029 Beijing, People’s Republic of China
| | - Xin Jin
- State Key Laboratory of Chemical
Resource Engineering, Department of Organic Chemistry, Faculty of
Science, Beijing University of Chemical Technology, 100029 Beijing, People’s Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical
Resource Engineering, Department of Organic Chemistry, Faculty of
Science, Beijing University of Chemical Technology, 100029 Beijing, People’s Republic of China
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14
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Yang Z, Xu J. Substituent effect on the diastereoselectivity in the sulfa-Staudinger cycloaddition. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.03.076] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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15
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Yang Z, Chen N, Xu J. Substituent-Controlled Annuloselectivity and Stereoselectivity in the Sulfa-Staudinger Cycloadditions. J Org Chem 2015; 80:3611-20. [DOI: 10.1021/acs.joc.5b00312] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Zhanhui Yang
- State Key Laboratory of Chemical
Resource Engineering, Department of Organic Chemistry, Faculty of
Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Ning Chen
- State Key Laboratory of Chemical
Resource Engineering, Department of Organic Chemistry, Faculty of
Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical
Resource Engineering, Department of Organic Chemistry, Faculty of
Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
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16
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Yang Z, Xu J. Insights into the β-Sultam Ring Formation in the Sulfa-Staudinger Cycloadditions. J Org Chem 2014; 79:10703-8. [DOI: 10.1021/jo5020933] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Zhanhui Yang
- State Key Laboratory of Chemical
Resource Engineering, Department of Organic Chemistry, Faculty of
Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
| | - Jiaxi Xu
- State Key Laboratory of Chemical
Resource Engineering, Department of Organic Chemistry, Faculty of
Science, Beijing University of Chemical Technology, Beijing 100029, People’s Republic of China
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17
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Wang Y, Wei D, Li Z, Zhu Y, Tang M. DFT study on the mechanisms and diastereoselectivities of Lewis acid-promoted ketene-alkene [2 + 2] cycloadditions: what is the role of Lewis acid in the ketene and C = X (X = O, CH₂, and NH) [2 + 2] cycloaddition reactions? J Phys Chem A 2014; 118:4288-300. [PMID: 24874716 DOI: 10.1021/jp500358m] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
The detailed mechanisms and diastereoselectivities of Lewis acid-promoted ketene-alkene [2 + 2] cycloaddition reactions have been studied by density functional theory (DFT). Four possible reaction channels, including two noncatalyzed diastereomeric reaction channels (channels A and B) and two Lewis acid (LA) ethylaluminum dichloride (EtAlCl2) catalyzed diastereomeric reaction channels (channels C and D), have been investigated in this work. The calculated results indicate that channel A (associated with product R-configurational cycloputanone) is more energy favorable than channel B (associated with the other product S-configurational cyclobutanone) under noncatalyzed condition, but channel D leading to S-configurational cyclobutanone is more energy-favorable than channel C, leading to R-configurational cycloputanone under a LA-promoted condition, which is consistent with the experimental results. And Lewis acid can make the energy barrier of ketene-alkene [2 + 2] cycloaddition much lower. In order to explore the role of LA in ketene and C = X (X = O, CH2, and NH) [2 + 2] cycloadditions, we have tracked and compared the interaction modes of frontier molecular orbitals (FMOs) along the intrinsic reaction coordinate (IRC) under the two different conditions. Besides by reducing the energy gap between the FMOs of the reactants, our computational results demonstrate that Lewis acid lowers the energy barrier of the ketene and C = X [2 + 2] cycloadditions by changing the overlap modes of the FMOs, which is remarkably different from the traditional FMO theory. Furthermore, analysis of global reactivity indexes has also been performed to explain the role of LA catalyst in the ketene-alkene [2 + 2] cycloaddition reaction.
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Affiliation(s)
- Yang Wang
- The College of Chemistry and Molecular Engineering, Center of Computational Chemistry, Zhengzhou University , Zhengzhou, Henan Province 450001, P.R. China
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18
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Yang Z, Li S, Zhang Z, Xu J. Base-switched annuloselectivity in the reactions of ethyl malonyl chloride and imines. Org Biomol Chem 2014; 12:9822-30. [DOI: 10.1039/c4ob01454e] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The [2 + 2] and [2 + 2 + 2] annuloselectivity in the reactions of ethyl malonyl chloride with imines was controlled by different bases, providing a simple synthesis of β-lactam-3-carboxylates and 2,3-dihydro-1,3-oxazin-4-ones.
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Affiliation(s)
- Zhanhui Yang
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029, P. R. China
| | - Siqi Li
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029, P. R. China
| | - Zhong Zhang
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029, P. R. China
| | - Jiaxi Xu
- State Key Laboratory of Chemical Resource Engineering
- Department of Organic Chemistry
- Faculty of Science
- Beijing University of Chemical Technology
- Beijing 100029, P. R. China
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19
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Allen AD, Tidwell TT. Structure and Mechanism in Ketene Chemistry. ADVANCES IN PHYSICAL ORGANIC CHEMISTRY 2014. [DOI: 10.1016/b978-0-12-800256-8.00004-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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20
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Affiliation(s)
- Annette D. Allen
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Thomas T. Tidwell
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
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