1
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Qatran Al-Khdhairawi AA, Yuan T, Van Hecke K, Winne JM. Dearomative (3 + 2) Cycloaddition of Indoles for the Stereoselective Assembly of Fully Functionalized Cyclopentanoids. Org Lett 2024; 26:4077-4081. [PMID: 38696160 DOI: 10.1021/acs.orglett.4c01139] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
The gold(I)-catalyzed dearomative cyclopentannulation of various indoles with 2-ethynyl-1,3-dithiolane is reported. The method generates three new stereocenters with excellent control of relative stereochemistry and is tolerant of diverse functionalization and substitution patterns on the indoles. The obtained cyclopentane-fused indolines allow for interesting subsequent synthetic manipulations, giving rise to fully substituted cyclopentanes with control of the relative stereochemistry of all five stereocenters. The reported reaction illustrates and elucidates a mechanistic dichotomy underlying gold(I)-catalyzed reactions of 2-ethynyl-1,3-dithiolane.
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Affiliation(s)
| | - Tengrui Yuan
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, B-9000 Ghent, Belgium
- Yunnan Precious Metals Lab Co., Ltd, Keji Road 988, Kunming, Yunnan 650106, China
| | - Kristof Van Hecke
- XStruct, Department of Chemistry, Ghent University, Krijgslaan 281-S3, B-9000 Ghent, Belgium
| | - Johan M Winne
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, B-9000 Ghent, Belgium
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2
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Martínez-Núñez C, Velasco N, Sanz R, Suárez-Pantiga S. Synthesis of highly substituted 1,3-dienes through halonium promoted 1,2-sulfur migration of propargylic thioethers. Chem Commun (Camb) 2024; 60:1794-1797. [PMID: 38258886 DOI: 10.1039/d3cc06194a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Conjugated 1-bromo or 1-iodo-1,3-dienes bearing a sulfide substituent have been synthesized via 1,2-sulfur migration from propargylic thioethers upon activation with NIS or NBS. The reaction generally proceeds with high control over the regio- and diastereoselectivity. Highly substituted thiophenes and selenophenes are easily obtained from the generated dienes.
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Affiliation(s)
- Clara Martínez-Núñez
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001-Burgos, Spain.
| | - Noelia Velasco
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001-Burgos, Spain.
| | - Roberto Sanz
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001-Burgos, Spain.
| | - Samuel Suárez-Pantiga
- Departamento de Química, Facultad de Ciencias, Universidad de Burgos, Pza. Misael Bañuelos s/n, 09001-Burgos, Spain.
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3
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Nicholls TP, Jia Z, Chalker JM. Electrochemical Synthesis of Gold-N-Heterocyclic Carbene Complexes. Chemistry 2024; 30:e202303161. [PMID: 37876029 DOI: 10.1002/chem.202303161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2023] [Revised: 10/23/2023] [Accepted: 10/24/2023] [Indexed: 10/26/2023]
Abstract
An electrochemical synthesis of gold(I)-N-heterocyclic carbene (Au-NHC) complexes has been developed. The electrochemical methodology uses only imidazolium salts, gold metal electrodes, and electricity to produce these complexes with hydrogen gas as the only by-product. This high-yielding and operationally simple procedure has been used to produce eight mononuclear and three dinuclear Au-NHC complexes. The electrochemical procedure facilitates a clean reaction with no by-products. As such, Au-NHC complexes can be directly transferred to catalytic reactions without work-up or purification. The Au-NHC complexes were produced on-demand and tested as catalysts in a vinylcyclopropanation reaction. All mononuclear Au-NHC complexes performed similarly to or better than the isolated complexes.
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Affiliation(s)
- Thomas P Nicholls
- Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Bedford Park, South Australia, 5042, Australia
| | - Zhongfan Jia
- Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Bedford Park, South Australia, 5042, Australia
| | - Justin M Chalker
- Institute for Nanoscale Science and Technology, College of Science and Engineering, Flinders University, Bedford Park, South Australia, 5042, Australia
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4
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Zhuang QB, Tian JR, Lu K, Zhang XM, Zhang FM, Tu YQ, Fan R, Li ZH, Zhang YD. Catalytic Asymmetric Polycyclization of Tertiary Enamides with Silyl Enol Ethers: Total Synthesis of (-)-Cephalocyclidin A. J Am Chem Soc 2023. [PMID: 38019148 DOI: 10.1021/jacs.3c11178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
A catalytic enantioselective polycyclization of tertiary enamides with terminal silyl enol ethers has been developed by virtue of Cu(OTf)2 catalysis with a novel spiropyrroline-derived oxazole (SPDO) ligand. This tandem reaction offers an effective approach to assemble bicyclic and tricyclic N-heterocycles bearing both aza- and oxa-quaternary stereogenic centers, which are primal subunits in a range of natural alkaloids. Strategic application of this methodology and a late-stage radical cyclization as key steps have been showcased in the concise total synthesis of (-)-cephalocyclidin A.
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Affiliation(s)
- Qing-Bo Zhuang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Jin-Rui Tian
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Ka Lu
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Xiao-Ming Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Fu-Min Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Yong-Qiang Tu
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- School of Chemistry and Chemical Engineering, Frontier Scientific Center of Transformative Molecules, Shanghai Key Laboratory of Chiral Drugs and Engineering, Shanghai Jiao Tong University, Shanghai Minhang 200240, China
| | - Rong Fan
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Zhi-Hao Li
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Yu-Dong Zhang
- State Key Laboratory of Applied Organic Chemistry & College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
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5
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Ryckaert B, Hullaert J, Van Hecke K, Winne JM. Dithioallyl Cations in Stereoselective Dearomative (3 + 2) Cycloadditions of Benzofurans: Mechanism and Synthetic Applications. J Org Chem 2023; 88:14504-14514. [PMID: 37812456 DOI: 10.1021/acs.joc.3c01546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
A stereoselective dearomative cyclopentannulation of benzofurans is reported. A previously reported dearomative (3 + 2) cycloaddition of indoles with 1,4-dithiane-fused allyl cations was found to lack stereoselectivity when more substituted cyclopentene rings are targeted. However, for benzofuran substrates, excellent levels of stereoselectivity were observed for the same allyl cation reagents under very similar reaction conditions. In this full account, we provide a mechanistic rationale and some design principles that govern the stereoselectivity of the intriguing dearomative transformations using dithioallyl cations and demonstrate how the stereoselectivity depends on electronic factors of the starting materials. The stereoselective methodology is also applied in a straightforward dearomative synthesis of the tricyclic sesquiterpenoid natural product aplysin and its analogues, starting from a simple benzofuran.
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Affiliation(s)
- Bram Ryckaert
- OS Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, Ghent B-9000, Belgium
| | - Jan Hullaert
- OS Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, Ghent B-9000, Belgium
| | - Kristof Van Hecke
- XStruct, Department of Chemistry, Ghent University, Krijgslaan 281-S3, Ghent B-9000, Belgium
| | - Johan M Winne
- OS Group, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, Ghent B-9000, Belgium
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6
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Degroote F, Denoo B, Ryckaert B, Callebaut B, Van Hecke K, Hullaert J, Winne JM. Dithioallyl cation (3 + 2) cycloadditions under aprotic reaction conditions: rapid access to spiro-fused cyclopentane scaffolds. Org Biomol Chem 2023; 21:8117-8124. [PMID: 37786324 DOI: 10.1039/d3ob01273e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
We report a general method to effect all-carbon (3 + 2) cycloadditions that can elaborate cyclopentenes from a range of olefins. The required dithioallyl cation reagents can be generated in a newly developed mild protocol starting from 2-allyloxypyridine precursors, thus avoiding the use of strong Brønsted acids. The novel method significantly expands the substrate scope, which now also includes acid-sensitive olefins, and thus enables the preparation of previously inaccessible spiro-fused scaffold types from simple and readily available starting materials.
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Affiliation(s)
- Frederick Degroote
- OSgroup, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, 9000 Ghent, Belgium.
| | - Bram Denoo
- OSgroup, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, 9000 Ghent, Belgium.
| | - Bram Ryckaert
- OSgroup, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, 9000 Ghent, Belgium.
| | - Brenda Callebaut
- OSgroup, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, 9000 Ghent, Belgium.
| | - Kristof Van Hecke
- XStruct, Department of Chemistry, Ghent University, Krijgslaan 281-S3, 9000 Ghent, Belgium
| | - Jan Hullaert
- OSgroup, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, 9000 Ghent, Belgium.
| | - Johan M Winne
- OSgroup, Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, 9000 Ghent, Belgium.
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7
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Zheng R, Xu A, Zhang T, Li P, Shi M, Dong S, Hu W, Qian Y. Asymmetric Acyclic 1,3-Difunctionalization of Vinyl Carbenes via Site-Selective Vinylogous Mannich-Type Interception of Oxonium Ylides. Org Lett 2023. [PMID: 37440433 DOI: 10.1021/acs.orglett.3c01983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/15/2023]
Abstract
A novel and highly stereoselective acyclic 1,3-difunctionalization of vinyl metal carbene species has been developed via Rh(II)/chiral phosphoric acid co-catalyzed three-component reactions of vinyldiazoacetates with alcohols and imines. This innovative approach features excellent regio-, diastereo-, and enantioselectivities, demonstrating a broad scope and functional group compatibility. Notably, this is the first example of three-component asymmetric acyclic 1,3-difunctionalization with in situ-formed vinyl metal carbenes.
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Affiliation(s)
- Rimei Zheng
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510006, People's Republic of China
| | - Aimin Xu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510006, People's Republic of China
| | - Tianyuan Zhang
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510006, People's Republic of China
| | - Pei Li
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510006, People's Republic of China
| | - Maoqing Shi
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510006, People's Republic of China
| | - Shanliang Dong
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510006, People's Republic of China
| | - Wenhao Hu
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510006, People's Republic of China
| | - Yu Qian
- Guangdong Provincial Key Laboratory of Chiral Molecule and Drug Discovery, School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou, Guangdong 510006, People's Republic of China
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8
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Ryckaert B, Demeyere E, Degroote F, Janssens H, Winne JM. 1,4-Dithianes: attractive C2-building blocks for the synthesis of complex molecular architectures. Beilstein J Org Chem 2023; 19:115-132. [PMID: 36761474 PMCID: PMC9907017 DOI: 10.3762/bjoc.19.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2022] [Accepted: 01/20/2023] [Indexed: 02/05/2023] Open
Abstract
This review covers the synthetic applications of 1,4-dithianes, as well as derivatives thereof at various oxidation states. The selected examples show how the specific heterocyclic reactivity can be harnessed for the controlled synthesis of carbon-carbon bonds. The reactivity is compared to and put into context with more common synthetic building blocks, such as 1,3-dithianes and (hetero)aromatic building blocks. 1,4-Dithianes have as yet not been investigated to the same extent as their well-known 1,3-dithiane counterparts, but they do offer attractive transformations that can find good use in the assembly of a wide array of complex molecular architectures, ranging from lipids and carbohydrates to various carbocyclic scaffolds. This versatility arises from the possibility to chemoselectively cleave or reduce the sulfur-heterocycle to reveal a versatile C2-synthon.
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Affiliation(s)
- Bram Ryckaert
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 (S4), 9000 Gent, Belgium
| | - Ellen Demeyere
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 (S4), 9000 Gent, Belgium
| | - Frederick Degroote
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 (S4), 9000 Gent, Belgium
| | - Hilde Janssens
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 (S4), 9000 Gent, Belgium
| | - Johan M Winne
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281 (S4), 9000 Gent, Belgium
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9
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Saito K, Aoyama H, Sako M, Arisawa M, Murai K. Double Ring Expansion Strategy for Fused 3-Benzazepines: Alternative Synthesis of the Dolby-Weinreb Enamine. J Org Chem 2022; 87:16947-16951. [PMID: 36475678 DOI: 10.1021/acs.joc.2c02475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A double ring expansion strategy for constructing fused 3-benzazepines is described. The oxidative ring expansion of spiroamine compounds with N-chlorosuccinimide and subsequent ring expansion of the resulting ketiminium ion intermediates with trimethylsilyldiazomethane afforded fused 3-benzazepines in a one-pot operation. Importantly, the Dolby-Weinreb enamine, which is a key synthetic intermediate for harringtonine alkaloids, cephalotaxines, can be accessed from commercial materials in only two steps using our developed method.
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Affiliation(s)
- Keigo Saito
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Hiroshi Aoyama
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Makoto Sako
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Mitsuhiro Arisawa
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
| | - Kenichi Murai
- Graduate School of Pharmaceutical Sciences, Osaka University, Suita, Osaka 565-0871, Japan
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10
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Wu R, Chen Y, Zhu S. Rh(II)-Catalyzed Enynal Cycloisomerization for the Generation of Vinyl Carbene: Divergent Access to Polycyclic Heterocycles. ACS Catal 2022. [DOI: 10.1021/acscatal.2c04832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Rui Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Yang Chen
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
| | - Shifa Zhu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, P. R. China
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11
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Velasco N, Martínez-Núñez C, Fernández-Rodríguez MÁ, Sanz R, Suárez-Pantiga S. NIS/HFIP–Mediated Synthesis of Indene‐based β‐Iodoalkenyl Sulfides from Propargylic Sulfides. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200613] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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12
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Chiral rhodium(II)-catalyzed asymmetric aldol-type interception of an oxonium ylide to assemble chiral 2,3-dihydropyrans. Sci China Chem 2022. [DOI: 10.1007/s11426-022-1275-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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13
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Ryckaert B, Hullaert J, Van Hecke K, Winne JM. Dearomative (3 + 2) Cycloadditions of Unprotected Indoles. Org Lett 2022; 24:4119-4123. [PMID: 35674713 DOI: 10.1021/acs.orglett.2c01214] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The (3 + 2) cycloaddition of various indoles with a dithioallyl cation affords dearomatized cyclopentannulated adducts, with complete control of regioselectivity and excellent chemo- and diastereoselectivity. The success of the reaction critically relies on the use of an excess of very strong Brønsted acid, which paradoxically prevents carbocationic side reactions. The reaction tolerates sensitive functionalities such as basic amines or free hydroxyls, and we demonstrate its use in late stage derivatization of highly functionalized, unprotected indoles.
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Affiliation(s)
- Bram Ryckaert
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, B-9000 Ghent, Belgium
| | - Jan Hullaert
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, B-9000 Ghent, Belgium
| | - Kristof Van Hecke
- Department of Chemistry, Ghent University, Krijgslaan 281-S3, B-9000 Ghent, Belgium
| | - Johan M Winne
- Department of Organic and Macromolecular Chemistry, Ghent University, Krijgslaan 281-S4, B-9000 Ghent, Belgium
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14
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Martínez‐Lara F, Suárez A, Velasco N, Suárez‐Pantiga S, Sanz R. Gold‐Catalyzed Reactions of 2‐Alkynyl‐1‐indolyl‐1,2‐diols with Thiols: Stereoselective Synthesis of (
Z
)‐α‐Indol‐3‐yl α‐(2‐Thioalkenyl) Ketones. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202100930] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Fernando Martínez‐Lara
- Área de Química Orgánica, Departamento de Química, Facultad de Ciencias Universidad de Burgos Pza. Misael Bañuelos s/n 09001- Burgos Spain
| | - Anisley Suárez
- Área de Química Orgánica, Departamento de Química, Facultad de Ciencias Universidad de Burgos Pza. Misael Bañuelos s/n 09001- Burgos Spain
| | - Noelia Velasco
- Área de Química Orgánica, Departamento de Química, Facultad de Ciencias Universidad de Burgos Pza. Misael Bañuelos s/n 09001- Burgos Spain
| | - Samuel Suárez‐Pantiga
- Área de Química Orgánica, Departamento de Química, Facultad de Ciencias Universidad de Burgos Pza. Misael Bañuelos s/n 09001- Burgos Spain
| | - Roberto Sanz
- Área de Química Orgánica, Departamento de Química, Facultad de Ciencias Universidad de Burgos Pza. Misael Bañuelos s/n 09001- Burgos Spain
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15
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Liu Z, Yang Y, Jiang X, Song Q, Zanoni G, Liu S, Bi X. Dearomative [4 + 3] cycloaddition of furans with vinyl- N-triftosylhydrazones by silver catalysis: stereoselective access to oxa-bridged seven-membered bicycles. Org Chem Front 2022. [DOI: 10.1039/d2qo00256f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A practical dearomative [4 + 3] cycloaddition of furans with vinylcarbenes to access oxa-bridged seven-membered carbocycles, with complete and predictable stereoselectivity, is achieved by merging silver catalysis and vinyl-N-triftosylhydrazones.
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Affiliation(s)
- Zhaohong Liu
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Yong Yang
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Xinyu Jiang
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Qingmin Song
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Giuseppe Zanoni
- Department of Chemistry, University of Pavia, Viale Taramelli 12, 27100, Pavia, Italy
| | - Shaopeng Liu
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
| | - Xihe Bi
- Department of Chemistry, Northeast Normal University, Changchun 130024, China
- State Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin 300071, China
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