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Yagci BB, Donmez SE, Şahin O, Türkmen YE. Catalytic aza-Nazarov cyclization reactions to access α-methylene-γ-lactam heterocycles. Beilstein J Org Chem 2023; 19:66-77. [PMID: 36741815 PMCID: PMC9874235 DOI: 10.3762/bjoc.19.6] [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: 12/04/2022] [Accepted: 01/10/2023] [Indexed: 01/19/2023] Open
Abstract
We have developed a catalytic aza-Nazarov reaction of N-acyliminium salts generated in situ from the reaction of a variety of cyclic and acyclic imines with α,β-unsaturated acyl chlorides to afford substituted α-methylene-γ-lactam heterocycles. The reactions proceed effectively in the presence of catalytic (20 mol %) amounts of AgOTf as an anion exchange agent or hydrogen-bond donors such as squaramides and thioureas as anion-binding organocatalysts. The aza-Nazarov cyclization of 3,4-dihydroisoquinolines with α,β-unsaturated acyl chlorides gives tricyclic lactam products 7 in up to 79% yield with full diastereocontrol (dr = >99:1). The use of acyclic imines in a similar catalytic aza-Nazarov reaction with 20 mol % of AgOTf results in the formation of α-methylene-γ-lactam heterocycles 19 in up to 76% yield and with good to high diastereoselectivities (4.3:1 to 16:1). We have demonstrated the scalability of the reaction with a gram-scale example. The relative stereochemistry of the α-methylene-γ-lactam products 19 has been determined via the single-crystal X-ray analysis of lactam 19l. In order to shed light on the details of the reaction mechanism, we have performed carefully designed mechanistic studies which consist of experiments on the effect of β-silicon stabilization, the alkene geometry of the α,β-unsaturated acyl chloride reactants, and adventitious water on the success of the catalytic aza-Nazarov reaction.
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Affiliation(s)
- Bilge Banu Yagci
- Department of Chemistry, Faculty of Science, Bilkent University, Ankara 06800, Turkey
| | - Selin Ezgi Donmez
- Department of Chemistry, Faculty of Science, Bilkent University, Ankara 06800, Turkey
| | - Onur Şahin
- Department of Occupational Health & Safety, Faculty of Health Sciences, Sinop University, Sinop 57000, Turkey
| | - Yunus Emre Türkmen
- Department of Chemistry, Faculty of Science, Bilkent University, Ankara 06800, Turkey
- UNAM – National Nanotechnology Research Center, Institute of Materials Science and Nanotechnology, Bilkent University, Ankara 06800, Turkey
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Sengoku T, Makino K, Iijima A, Inuzuka T, Yoda H. Bifurcated synthesis of methylene-lactone- and methylene-lactam-fused spirolactams via electrophilic amide allylation of γ-phenylthio-functionalized γ-lactams. Beilstein J Org Chem 2020; 16:2769-2775. [PMID: 33224303 PMCID: PMC7670114 DOI: 10.3762/bjoc.16.227] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 11/06/2020] [Indexed: 11/23/2022] Open
Abstract
New synthetic methods for spirolactams bearing an α-methylene-γ-butyrolactone or its analogous methylene-lactam have been developed. The allylation of γ-phenylthio-functionalized γ-lactams with 2-(acetoxy)methyl acrylamides was accomplished by using 2.5 equivalents of NaH to give the corresponding adducts in excellent yields. The remaining phenylthio group was substituted with a hydroxy group by treatment with CuBr, and the resulting γ-hydroxyamides were cyclized under acidic conditions to afford the corresponding methylene-lactam-fused spirolactams in high yields. On the other hand, methylene-lactone-fused spirolactams could be delivered from the allyl adducts in high yields through a sequential N-Boc protection/desulfinative lactonization.
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Affiliation(s)
- Tetsuya Sengoku
- Department of Applied Chemistry, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Koki Makino
- Department of Applied Chemistry, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Ayumi Iijima
- Department of Applied Chemistry, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Toshiyasu Inuzuka
- Division of Instrumental Analysis, Life Science Research Center, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Hidemi Yoda
- Department of Applied Chemistry, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
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Sengoku T, Maegawa R, Imamura H, Wada M, Yoda H. Zinc Hydroxide‐Catalyzed Asymmetric Allylation of Acetophenones with Amido‐Functionalized Allylboronate in Water. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000195] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Tetsuya Sengoku
- Department of Applied Chemistry, Faculty of EngineeringShizuoka University 3-5-1 Johoku, Naka-ku Hamamatsu 432-8561 Japan
| | - Ryunosuke Maegawa
- Department of Applied Chemistry, Faculty of EngineeringShizuoka University 3-5-1 Johoku, Naka-ku Hamamatsu 432-8561 Japan
| | - Hiroki Imamura
- Department of Applied Chemistry, Faculty of EngineeringShizuoka University 3-5-1 Johoku, Naka-ku Hamamatsu 432-8561 Japan
| | - Mitsuo Wada
- Department of Applied Chemistry, Faculty of EngineeringShizuoka University 3-5-1 Johoku, Naka-ku Hamamatsu 432-8561 Japan
| | - Hidemi Yoda
- Department of Applied Chemistry, Faculty of EngineeringShizuoka University 3-5-1 Johoku, Naka-ku Hamamatsu 432-8561 Japan
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Donmez SE, Soydaş E, Aydın G, Şahin O, Bozkaya U, Türkmen YE. Aza-Nazarov Cyclization Reactions via Anion Exchange Catalysis. Org Lett 2019; 21:554-558. [PMID: 30985150 DOI: 10.1021/acs.orglett.8b03886] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
A catalytic aza-Nazarov cyclization between 3,4-dihydroisoquinolines and α,β-unsaturated acyl chlorides has been developed to access α-methylene-γ-lactam products in good yields (up to 79%) as single diastereomers. The reactions proceed efficiently when AgOTf is used as an anion exchange catalyst with a 20 mol % loading at 80 °C. Computational studies were performed to investigate the reaction mechanism, and the findings support the role of the -TMS group in reducing the reaction barrier of the key cyclization step.
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Affiliation(s)
- Selin E Donmez
- Department of Chemistry, Faculty of Science , Bilkent University , Ankara , 06800 , Turkey
| | - Emine Soydaş
- Department of Chemistry , Hacettepe University , Ankara , 06800 , Turkey
| | - Gökçen Aydın
- Department of Chemistry, Faculty of Science , Bilkent University , Ankara , 06800 , Turkey
| | - Onur Şahin
- Sinop University , Scientific and Technological Research Application and Research Center , Sinop , 57000 , Turkey
| | - Uğur Bozkaya
- Department of Chemistry , Hacettepe University , Ankara , 06800 , Turkey
| | - Yunus E Türkmen
- Department of Chemistry, Faculty of Science , Bilkent University , Ankara , 06800 , Turkey.,UNAM - National Nanotechnology Research Center, Institute of Materials Science and Nanotechnology , Bilkent University , Ankara , 06800 , Turkey
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5
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Sengoku T, Murata Y, Aso Y, Kawakami A, Inuzuka T, Sakamoto M, Takahashi M, Yoda H. Indium-Catalyzed Amide Allylation of N-Carbonyl Imides: Formation of Azaspiro-γ-lactones via Ring Opening–Reclosure. Org Lett 2015; 17:5846-9. [DOI: 10.1021/acs.orglett.5b03021] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tetsuya Sengoku
- Department
of Applied Chemistry, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Yusuke Murata
- Graduate
School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Yuwa Aso
- Department
of Applied Chemistry, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Ai Kawakami
- Department
of Applied Chemistry, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Toshiyasu Inuzuka
- Division
of Instrumental Analysis, Life Science Research Center, Gifu University, 1-1 Yanagido, Gifu 501-1193, Japan
| | - Masami Sakamoto
- Department
of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
| | - Masaki Takahashi
- Department
of Applied Chemistry, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
| | - Hidemi Yoda
- Department
of Applied Chemistry, Faculty of Engineering, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
- Graduate
School of Science and Technology, Shizuoka University, 3-5-1 Johoku, Naka-ku, Hamamatsu 432-8561, Japan
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6
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Cyclic azomethines and their hydrogenated derivatives. (Review). Chem Heterocycl Compd (N Y) 2000. [DOI: 10.1007/bf02290837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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