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Xu X, Li RP, Zhang Z, Gong X, Zheng Y, Tang S. Regioselective Synthesis of Multisubstituted 2,3-Dihydrooxazoles by 1,3-Dithiane Umpolung. Org Lett 2024; 26:6825-6829. [PMID: 39110706 DOI: 10.1021/acs.orglett.4c02176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/17/2024]
Abstract
Herein, we report a novel strategy for the regioselective synthesis of aromatic and heteroaromatic 2,3-dihydrooxazoles from 2-alkynyl-1,3-dithianes and nitrones. This method exploits the 1,3-dithiane umpolung, nucleophilic cycloaddition, and rearrangement processes to achieve the rapid assembly of dihydrooxazole molecules. The regioselective method is extremely mild, achieving complete conversion within one min under air at 25 °C with high efficiency.
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Affiliation(s)
- Xiangrong Xu
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Rui-Peng Li
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Zhuzhu Zhang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xiaomeng Gong
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Yi Zheng
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
| | - Shouchu Tang
- School of Pharmacy, Lanzhou University, Lanzhou 730000, P. R. China
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2
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Bonner A, Baumann M. Development of a Continuous Flow Baldwin Rearrangement Process and Its Comparison to Traditional Batch Mode. Org Process Res Dev 2024; 28:1567-1575. [PMID: 38783852 PMCID: PMC11110046 DOI: 10.1021/acs.oprd.3c00213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2023] [Indexed: 05/25/2024]
Abstract
A new and highly efficient continuous flow process is presented for the synthesis of aziridines via the thermal Baldwin rearrangement. The process was initially explored using traditional batch synthesis techniques but suffered from moderate yields, long reaction times, and moderate diastereoselectivities. Here we demonstrate that the process can be greatly improved upon its transfer to continuous flow, which afforded the aziridine targets in high yields, short reaction times, and consistently high diastereoselectivities, with the high-throughput process rendering multigram quantities of product in short periods of time. In addition, flow processing extended the substrate scope including several examples that had failed in batch mode, thus demonstrating the value of this overlooked entry into valuable aziridine species.
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Affiliation(s)
- Arlene Bonner
- School
of Chemistry, University College Dublin, Science Centre South, Belfield, Dublin 4, Ireland D04 N2E2
| | - Marcus Baumann
- School
of Chemistry, University College Dublin, Science Centre South, Belfield, Dublin 4, Ireland D04 N2E2
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Akulov AA, Varaksin MV, Mampuys P, Charushin VN, Chupakhin ON, Maes BUW. C(sp 2)-H functionalization in non-aromatic azomethine-based heterocycles. Org Biomol Chem 2021; 19:297-312. [PMID: 33026389 DOI: 10.1039/d0ob01580f] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Direct C(sp2)-H functionalization of the endocyclic azomethine and aldonitrone moieties in non-aromatic azaheterocycles has established itself as a promising methodology over the last decade. Transition metal-catalyzed cross-coupling reactions, α-metalation-electrophile quenching protocols, and (metal-free) nucleophilic substitution of hydrogen reactions (SNH) are the major routes applied on cyclic imines and their derivatives. In this overview, we show the tangible progress made in this area during the period from 2008 to 2020.
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Affiliation(s)
- Alexey A Akulov
- Department of Organic & Biomolecular Chemistry, Ural Federal University, 19 Mira Str., 620002 Ekaterinburg, Russia.
| | - Mikhail V Varaksin
- Department of Organic & Biomolecular Chemistry, Ural Federal University, 19 Mira Str., 620002 Ekaterinburg, Russia. and Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskaya Str., 620990 Ekaterinburg, Russia
| | - Pieter Mampuys
- Division of Organic Synthesis, Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium.
| | - Valery N Charushin
- Department of Organic & Biomolecular Chemistry, Ural Federal University, 19 Mira Str., 620002 Ekaterinburg, Russia. and Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskaya Str., 620990 Ekaterinburg, Russia
| | - Oleg N Chupakhin
- Department of Organic & Biomolecular Chemistry, Ural Federal University, 19 Mira Str., 620002 Ekaterinburg, Russia. and Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskaya Str., 620990 Ekaterinburg, Russia
| | - Bert U W Maes
- Division of Organic Synthesis, Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium.
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Zou N, Jiao JW, Feng Y, Pan CX, Liang C, Su GF, Mo DL. Iron(III)/Copper(II)-Cocatalyzed Cycloaddition/[3,3]-Rearrangement/N–O Bond Cleavage To Prepare Polysubstituted Pyrrolizines from N-Vinyl-α,β-Unsaturated Nitrones and Activated Alkynes. Org Lett 2019; 21:481-485. [DOI: 10.1021/acs.orglett.8b03767] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ning Zou
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin, 541004, China
| | - Ji-Wen Jiao
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin, 541004, China
| | - Yu Feng
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin, 541004, China
| | - Cheng-Xue Pan
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin, 541004, China
| | - Cui Liang
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin, 541004, China
| | - Gui-Fa Su
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin, 541004, China
| | - Dong-Liang Mo
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, Ministry of Science and Technology of China, School of Chemistry and Pharmaceutical Sciences, Guangxi Normal University, 15 Yu Cai Road, Guilin, 541004, China
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5
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Tangara S, Kanazawa A, Py S. The Baldwin Rearrangement: Synthesis of 2-Acylaziridines. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700920] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Salia Tangara
- Univ. Grenoble Alpes; DCM; CNRS; 38000 Grenoble France
| | | | - Sandrine Py
- Univ. Grenoble Alpes; DCM; CNRS; 38000 Grenoble France
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Tangara S, Aupic C, Kanazawa A, Poisson JF, Py S. Aziridination of Cyclic Nitrones Targeting Constrained Iminosugars. Org Lett 2017; 19:4842-4845. [DOI: 10.1021/acs.orglett.7b02283] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Salia Tangara
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
| | - Clara Aupic
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
| | - Alice Kanazawa
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
| | - Jean-François Poisson
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
| | - Sandrine Py
- Univ. Grenoble Alpes, DCM, F-38000 Grenoble, France
- CNRS, DCM, F-38000 Grenoble, France
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7
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Unexpected synthesis of aziridines under Cu(I) catalyzed Kinugasa conditions assisted by microwave irradiation. CR CHIM 2016. [DOI: 10.1016/j.crci.2015.09.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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8
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MacKenzie DA, Pezacki JP. Kinetics studies of rapid strain-promoted [3+2] cycloadditions of nitrones with bicyclo[6.1.0]nonyne. CAN J CHEM 2014. [DOI: 10.1139/cjc-2013-0577] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Strain-promoted alkyne−nitrone cycloaddition (SPANC) reactions represent a bioorthogonal labeling strategy that is both very rapid and at the same time efficient and selective. Nitrones provide increased reaction rates as well as greater susceptibility toward stereoelectronic modification when compared with organic azides. We find that strain-promoted cycloadditions of cyclic nitrones with bicyclo[6.1.0]nonyne react with second-order rate constants as large as 1.49 L mol−1 s−1 at 25 °C. These reactions display rate constants that are up to 37-fold greater than those of the analogous reactions of benzyl azide with bicyclo[6.1.0]nonyne. We observed that reactions of nitrones with bicyclo[6.1.0]nonyne showed a stronger dependence on substituent effect for the reaction, as evidenced by a larger Hammett ρ value, than that for biaryl-aza-cyclooctanone. We demonstrate the ability to stereoelectronically tune the reactivity of nitrones towards different cyclooctynes in SPANC reactions. This ability to introduce selectivity into different SPANC reactions through substituent provides the opportunity to perform multiple SPANC reactions in one reaction vessel and opens up potential applications in multiplex labeling.
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Affiliation(s)
- Douglas A. MacKenzie
- Life Sciences Division, National Research Council of Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6, Canada; Department of Chemistry, University of Ottawa, 10 Marie-Curie, Ottawa, ON K1N 6N5, Canada
| | - John Paul Pezacki
- Life Sciences Division, National Research Council of Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6, Canada; Department of Chemistry, University of Ottawa, 10 Marie-Curie, Ottawa, ON K1N 6N5, Canada
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9
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Reddy AR, Zhou CY, Che CM. Ruthenium Porphyrin Catalyzed Three-Component Reaction of Diazo Compounds, Nitrosoarenes, and Alkynes: An Efficient Approach to Multifunctionalized Aziridines. Org Lett 2014; 16:1048-51. [DOI: 10.1021/ol4035098] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Annapureddy Rajasekar Reddy
- HKU
Shenzhen Institute of Research and Innovation, Shenzhen, China
- State
Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Cong-Ying Zhou
- HKU
Shenzhen Institute of Research and Innovation, Shenzhen, China
- State
Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
| | - Chi-Ming Che
- HKU
Shenzhen Institute of Research and Innovation, Shenzhen, China
- State
Key Laboratory of Synthetic Chemistry and Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, China
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Bhattacharya D, Ghorai A, Pal U, Chandra Maiti N, Chattopadhyay P. Stereoselective domino azidation and [3 + 2] cycloaddition: a facile route to chiral heterocyclic scaffolds from carbohydrate derived synthons. RSC Adv 2014. [DOI: 10.1039/c3ra45363d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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11
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Fujii H, Ishikawa K, Tomatsu M, Nagase H. Zinc-Acetic Acid Promoted Reductive Carbon-Nitrogen Bond Cleavage Reaction of α-Aminoketones. HETEROCYCLES 2014. [DOI: 10.3987/com-13-s(s)64] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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DeMong DE, Ng I, Miller MW, Stamford AW. A Novel Method for the Preparation of 4-Arylimidazolones. Org Lett 2013; 15:2830-3. [DOI: 10.1021/ol401165e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Duane E. DeMong
- Discovery and Preclinical Sciences, Merck Research Laboratories, 2015 Galloping Hill Road, K15-2-A218, Kenilworth, New Jersey 07033, United States
| | - Irene Ng
- Discovery and Preclinical Sciences, Merck Research Laboratories, 2015 Galloping Hill Road, K15-2-A218, Kenilworth, New Jersey 07033, United States
| | - Michael W. Miller
- Discovery and Preclinical Sciences, Merck Research Laboratories, 2015 Galloping Hill Road, K15-2-A218, Kenilworth, New Jersey 07033, United States
| | - Andrew W. Stamford
- Discovery and Preclinical Sciences, Merck Research Laboratories, 2015 Galloping Hill Road, K15-2-A218, Kenilworth, New Jersey 07033, United States
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Zhao H, Wang R, Chen P, Gregg BT, Hsia MM, Zhang W. Palladium-Catalyzed Direct Arylation of Imidazolone N-Oxides with Aryl Bromides and Its Application in the Synthesis of GSK2137305. Org Lett 2012; 14:1872-5. [DOI: 10.1021/ol300468g] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- He Zhao
- Medicinal Chemistry Department, AMRI, 26 Corporate Circle, P.O. Box 15098, Albany, New York 12212-5098, United States
| | - Ruifang Wang
- Medicinal Chemistry Department, AMRI, 26 Corporate Circle, P.O. Box 15098, Albany, New York 12212-5098, United States
| | - Ping Chen
- Medicinal Chemistry Department, AMRI, 26 Corporate Circle, P.O. Box 15098, Albany, New York 12212-5098, United States
| | - Brian T. Gregg
- Medicinal Chemistry Department, AMRI, 26 Corporate Circle, P.O. Box 15098, Albany, New York 12212-5098, United States
| | - Ming Min Hsia
- Medicinal Chemistry Department, AMRI, 26 Corporate Circle, P.O. Box 15098, Albany, New York 12212-5098, United States
| | - Wei Zhang
- Medicinal Chemistry Department, AMRI, 26 Corporate Circle, P.O. Box 15098, Albany, New York 12212-5098, United States
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Wu X, Na R, Liu H, Liu J, Wang M, Zhong J, Guo H. Sequential [3+2] cycloaddition/rearrangement reaction of imidazolone nitrones and allenoates for the efficient synthesis of functionalized imidazolidinone. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2011.11.049] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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