1
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Quintavalla A, Carboni D, Simeone M, Lombardo M. Stereoselective Synthesis of α-Disubstituted β-Homoprolines. Org Lett 2023; 25:7067-7071. [PMID: 37729003 PMCID: PMC10546376 DOI: 10.1021/acs.orglett.3c02891] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Indexed: 09/22/2023]
Abstract
An efficient enantioselective synthesis of chiral α-disubstituted β-homoprolines was developed, starting with the stereodivergent allylation of chiral N-tert-butanesulfinyl imines derived from 4-bromobutanal with indium or zinc and using well-established and reliable synthetic transformations. This methodology allows the easy introduction of different substituents at the α-position of the pyrrolidine scaffold and is characterized by the possibility of switching the absolute configuration of the newly formed stereocenter either by changing the configuration of the tert-butanesufinamide chiral auxiliary or by using a different stereodivergent allylation protocol with the same auxiliary.
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Affiliation(s)
- Arianna Quintavalla
- Alma
Mater Studiorum - University of Bologna, Department of Chemistry “G. Ciamician”, via P. Gobetti 85, 40129 Bologna, Italy
- Center
for Chemical Catalysis - C3, Alma Mater
Studiorum - Università di Bologna, via P. Gobetti 85, 40129 Bologna, Italy
| | - Davide Carboni
- Alma
Mater Studiorum - University of Bologna, Department of Chemistry “G. Ciamician”, via P. Gobetti 85, 40129 Bologna, Italy
- Center
for Chemical Catalysis - C3, Alma Mater
Studiorum - Università di Bologna, via P. Gobetti 85, 40129 Bologna, Italy
| | - Maria Simeone
- Alma
Mater Studiorum - University of Bologna, Department of Chemistry “G. Ciamician”, via P. Gobetti 85, 40129 Bologna, Italy
| | - Marco Lombardo
- Alma
Mater Studiorum - University of Bologna, Department of Chemistry “G. Ciamician”, via P. Gobetti 85, 40129 Bologna, Italy
- Center
for Chemical Catalysis - C3, Alma Mater
Studiorum - Università di Bologna, via P. Gobetti 85, 40129 Bologna, Italy
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2
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Momiyama N, Jongwohan C, Ohtsuka N, Chaibuth P, Fujinami T, Adachi K, Suzuki T. Chiral Counteranion-Directed Catalytic Asymmetric Methylene Migration Reaction of Ene-Aldimines. J Org Chem 2022; 87:9399-9407. [PMID: 35736506 DOI: 10.1021/acs.joc.2c00742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A catalytic asymmetric methylene migration reaction of ene-aldimines directed by chiral counteranions is developed, with the optimal catalyst identified as phenanthryl-substituted (R)-BINOL phosphate. Control experiments and density functional theory computations reveal the importance of the 2-hydroxy group of the ene-aldimine and attractive (e.g., OH···O, CH···O, CH···π, and π···π) interactions for high enantioselectivity (up to 74% ee). The results contribute to the design of asymmetric catalysis for the rearrangement of highly reactive iminium intermediates.
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Affiliation(s)
- Norie Momiyama
- Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan.,SOKENDAI (Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Chanantida Jongwohan
- Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan.,SOKENDAI (Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Naoya Ohtsuka
- Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan.,SOKENDAI (Graduate University for Advanced Studies), Okazaki, Aichi 444-8787, Japan
| | - Pawittra Chaibuth
- Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan.,Faculty of Science, Chulalongkorn University, Pathumwan, Bangkok 10330, Thailand
| | | | - Kiyohiro Adachi
- Institute for Molecular Science, Okazaki, Aichi 444-8787, Japan.,Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 111-8656, Japan
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3
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Momiyama N, Honda Y, Suzuki T, Jongwohan C. Computational Studies on Reaction Mechanisms and Origin of Stereoselectivity in the [1,3]‐Rearrangement of Ene‐Aldimines. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100302] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Norie Momiyama
- Institute for Molecular Science Okazaki, Aichi 444-8787 Japan
- SOKENDAI The Graduate University for Advanced Studies) Okazaki, Aichi 444-8787 Japan
| | - Yasushi Honda
- West Japan Office, HPC Systems Inc. 646 Nijohanjikicho, Shimogyo-ku Kyoto 600-8412 Japan
| | | | - Chanantida Jongwohan
- Institute for Molecular Science Okazaki, Aichi 444-8787 Japan
- SOKENDAI The Graduate University for Advanced Studies) Okazaki, Aichi 444-8787 Japan
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4
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Gadde K, Maes BUW, Abbaspour Tehrani K. HFIP-mediated 2-aza-Cope rearrangement: metal-free synthesis of α-substituted homoallylamines at ambient temperature. Org Biomol Chem 2021; 19:4067-4075. [PMID: 33978010 DOI: 10.1039/d1ob00404b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
An efficient metal-free strategy for the synthesis of α-substituted homoallylamine derivatives has been developed via a 1,1,1,3,3,3-hexafluoro-2-propanol (HFIP)-promoted 2-aza-Cope rearrangement of aldimines, generated in situ by condensation of aldehydes with easily accessible 1,1-diphenylhomoallylamines. This reaction provides rapid access to α-substituted homoallylamines with excellent functional group tolerance and yields. The reaction takes place at room temperature and no chromatographic purification is required for product isolation. The synthetic utility of the current method is further demonstrated by the transformation of the obtained benzophenone ketimines into N-unprotected homoallylamines, an α-amino alcohol and an α-amino amide.
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Affiliation(s)
- Karthik Gadde
- Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
| | - Bert U W Maes
- Department of Chemistry, University of Antwerp, Groenenborgerlaan 171, B-2020 Antwerp, Belgium.
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5
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Kaur M, Garg S, Malhi DS, Sohal HS. A Review on Synthesis, Reactions and Biological Properties of Seven Membered Heterocyclic Compounds: Azepine, Azepane, Azepinone. CURR ORG CHEM 2021. [DOI: 10.2174/1385272825999210104222338] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Seven membered heterocyclic Azepine and its derivatives have great pharmacological
and therapeutic implications. In this review, the literature of the last fifty years has
been exploited for the synthesis, reaction, and biological properties of these seven-member
heterocyclic compounds. Most of the mechanisms involved the ring expansion of either five
or six-membered compounds using various methods such as thermally, photo-chemically, and
microwave irradiation. The systematically designed schemes involve the synthesis of different
derivatives of azepine, azepinone, azepane, etc., using similar moieties by various researchers.
However, there is much work yet to be done in the biological section, as it is not
explored and reported in the literature; therefore, N-containing seven-membered heterocycles
still have much scope for the researchers.
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Affiliation(s)
- Manvinder Kaur
- Department of Chemistry, Chandigarh University, Gharuan-140413, Mohali, Punjab, India
| | - Sonali Garg
- Department of Chemistry, Chandigarh University, Gharuan-140413, Mohali, Punjab, India
| | - Dharambeer S. Malhi
- Department of Chemistry, Chandigarh University, Gharuan-140413, Mohali, Punjab, India
| | - Harvinder S. Sohal
- Department of Chemistry, Chandigarh University, Gharuan-140413, Mohali, Punjab, India
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6
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Green JC, Zanghi JM, Meek SJ. Diastereo- and Enantioselective Synthesis of Homoallylic Amines Bearing Quaternary Carbon Centers. J Am Chem Soc 2020; 142:1704-1709. [PMID: 31934766 DOI: 10.1021/jacs.9b11529] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
A Cu-catalyzed method for the efficient enantio- and diastereoselective synthesis of chiral homoallylic amines bearing a quaternary carbon and an alkenylboron is disclosed. Transformations are promoted by a readily prepared (phosphoramidite)-Cu complex and involve bench-stable γ,γ-disubstituted allyldiborons and benzyl imines; products are obtained in up to 82% yield, >20:1 dr, and >99:1 er. Reactions proceed via stereodefined boron-stabilized allylic Cu species formed by an enantioselective transmetalation. Utility of the 1-amino-3-alkenylboronate products is highlighted by a variety of synthetic transformations.
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Affiliation(s)
- Jacob C Green
- Department of Chemistry , The University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
| | - Joseph M Zanghi
- Department of Chemistry , The University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
| | - Simon J Meek
- Department of Chemistry , The University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , United States
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7
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Wang X, Zeng X, Lin Q, Li M, Walsh PJ, Chruma JJ. Palladium‐Catalysed Decarboxylative Generation and Regiodivergent Prenylation of 2‐Azaallyl Anions. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900491] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Xiaoqian Wang
- Key Laboratory of Green Chemistry & Technology (MOE), College of Chemistry and Sino-British Materials Research Institute, College of Physical Science & Technology Sichuan University No. 29, Wangjiang Road, Chengdu Sichuan 610064 People's Republic of China
| | - Xi Zeng
- Key Laboratory of Green Chemistry & Technology (MOE), College of Chemistry and Sino-British Materials Research Institute, College of Physical Science & Technology Sichuan University No. 29, Wangjiang Road, Chengdu Sichuan 610064 People's Republic of China
| | - Qiao Lin
- Key Laboratory of Green Chemistry & Technology (MOE), College of Chemistry and Sino-British Materials Research Institute, College of Physical Science & Technology Sichuan University No. 29, Wangjiang Road, Chengdu Sichuan 610064 People's Republic of China
| | - Minyan Li
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry University of Pennsylvania 231 South 34th Street, Philadelphia Pennsylvania 19104-6323 United States
| | - Patrick J. Walsh
- Roy and Diana Vagelos Laboratories, Penn/Merck Laboratory for High-Throughput Experimentation, Department of Chemistry University of Pennsylvania 231 South 34th Street, Philadelphia Pennsylvania 19104-6323 United States
| | - Jason J. Chruma
- Key Laboratory of Green Chemistry & Technology (MOE), College of Chemistry and Sino-British Materials Research Institute, College of Physical Science & Technology Sichuan University No. 29, Wangjiang Road, Chengdu Sichuan 610064 People's Republic of China
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8
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Jongwohan C, Honda Y, Suzuki T, Fujinami T, Adachi K, Momiyama N. Brønsted Acid-Initiated Formal [1,3]-Rearrangement Dictated by β-Substituted Ene-Aldimines. Org Lett 2019; 21:4991-4995. [PMID: 31247769 DOI: 10.1021/acs.orglett.9b01533] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The rearrangement of ene-aldimines is a useful reaction for affording homoallylic amines. Despite their utilities in synthetic chemistry, the rearrangement for accessing homoallylic amines substituted at the 2-position remains elusive. In this study, the Brønsted acid-initiated formal [1,3]-rearrangement of ene-aldimines was developed to synthesize 2,4,4-substituted homoallylic amines that were otherwise inaccessible previously. Our study reveals an intermolecular pathway in which the rearrangement proceeds via a protonation-mediated 2-azaallenium cation.
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Affiliation(s)
- Chanantida Jongwohan
- Institute for Molecular Science , Okazaki , Aichi 444-8787 , Japan.,SOKENDAI, The Graduate University for Advanced Studies , Okazaki , Aichi 444-8787 , Japan
| | - Yasushi Honda
- West Japan Office , HPC Systems Inc. , 646 Nijohanjikicho , Shimogyo-ku, Kyoto 600-8412 , Japan
| | - Toshiyasu Suzuki
- Institute for Molecular Science , Okazaki , Aichi 444-8787 , Japan.,SOKENDAI, The Graduate University for Advanced Studies , Okazaki , Aichi 444-8787 , Japan
| | - Takeshi Fujinami
- Institute for Molecular Science , Okazaki , Aichi 444-8787 , Japan
| | - Kiyohiro Adachi
- Institute for Molecular Science , Okazaki , Aichi 444-8787 , Japan.,Department of Applied Chemistry, School of Engineering , The University of Tokyo , 7-3-1 Hongo , Bunkyo-ku , Tokyo 111-8656 , Japan
| | - Norie Momiyama
- Institute for Molecular Science , Okazaki , Aichi 444-8787 , Japan.,SOKENDAI, The Graduate University for Advanced Studies , Okazaki , Aichi 444-8787 , Japan
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9
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Gadde K, Daelemans J, Maes BUW, Abbaspour Tehrani K. Lewis acidic FeCl3 promoted 2-aza-Cope rearrangement to afford α-substituted homoallylamines in dimethyl carbonate. RSC Adv 2019; 9:18013-18017. [PMID: 35520547 PMCID: PMC9064679 DOI: 10.1039/c9ra03277k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2019] [Accepted: 05/29/2019] [Indexed: 01/08/2023] Open
Abstract
The current work shows an iron-catalyzed 2-aza-Cope rearrangement in dimethyl carbonate for the synthesis of a wide variety of α-substituted homoallylamines from readily accessible starting materials with diverse functional groups.
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Affiliation(s)
- Karthik Gadde
- Organic Synthesis
- Department of Chemistry
- University of Antwerp
- 2020 Antwerp
- Belgium
| | - Jonas Daelemans
- Organic Synthesis
- Department of Chemistry
- University of Antwerp
- 2020 Antwerp
- Belgium
| | - Bert U. W. Maes
- Organic Synthesis
- Department of Chemistry
- University of Antwerp
- 2020 Antwerp
- Belgium
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