1
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Sakai D, Kojima T, Kawasaki-Takasuka T, Mori K. Stereoselective synthesis of 6/7/6-fused heterocycles with multiple stereocenters via an internal redox reaction/inverse electron-demand hetero-Diels-Alder reaction sequence. Chem Commun (Camb) 2024; 60:6797-6800. [PMID: 38869043 DOI: 10.1039/d4cc02351j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2024]
Abstract
A highly stereoselective synthesis of fused heterocycles with multiple stereocenters via an internal redox reaction/inverse electron-demand hetero-Diels-Alder (IEDHDA) reaction sequence is described. The present reaction sequence has three interesting features: (1) complete control of two potentially competitive processes, i.e., hetero-Diels-Alder reaction and [1,5]-hydride shift; (2) one-shot construction of the complicated 6/7/6-fused heterocyclic structure having multiple stereocenters; and (3) high control of its stereoselectivity. When alkenylidene barbiturates with an allyl benzyl ether moiety were treated with a catalytic amount of Sc(OTf)3 and 2,2'-bipyridine, the internal redox reaction/IEDHDA reaction proceeded successively to afford 6/7/6-fused heterocycles in good chemical yields with good to excellent diastereoselectivities.
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Affiliation(s)
- Dan Sakai
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan.
| | - Tatsuhiro Kojima
- Department of Applied Chemistry, Kobe City College of Technology (KCCT), 8-3 Gakuen-Higashimachi, Nishi-ku, Kobe, Hyogo 651-2194, Japan
| | - Tomoko Kawasaki-Takasuka
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan.
| | - Keiji Mori
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan.
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2
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Tian FX, Liu FF, Wei J, Xiao JX, Qu J. Redox-neutral α-functionalization of pyrrolidines: facile access to α-aryl-substituted pyrrolidines. RSC Adv 2024; 14:11986-11991. [PMID: 38623291 PMCID: PMC11017964 DOI: 10.1039/d4ra00983e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Accepted: 04/05/2024] [Indexed: 04/17/2024] Open
Abstract
α-Aryl-substituted pyrrolidine moiety is found in many natural alkaloids. Starting from pyrrolidine, we were able to synthesize α-aryl-substituted pyrrolidines in one step using quinone monoacetal as the oxidizing agent and DABCO as the base. We also discovered the reaction condition needed to efficiently remove the N-aryl moiety from the α-arylated product. When the above reaction was carried out without the addition of an aryl nucleophile, the reaction of pyrrolidine and quinone monoacetal in 2,2,2-trifluoroethanol afforded octahydro-dipyrroloquinoline in high yield, which has the same skeleton as that of natural product incargranine B.
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Affiliation(s)
- Feng-Xian Tian
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 People's Republic of China
| | - Fan-Fan Liu
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 People's Republic of China
| | - Jian Wei
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 People's Republic of China
| | - Jia-Xi Xiao
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 People's Republic of China
| | - Jin Qu
- The State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University Tianjin 300071 People's Republic of China
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3
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Wang L, Song X, Guo F, Xu L, Hu F, Guo FW, Li SS. Diversity-oriented synthesis of indole-fused scaffolds and bis(indolyl)methane from tosyl-protected tryptamine. Org Biomol Chem 2024; 22:2824-2834. [PMID: 38511321 DOI: 10.1039/d4ob00099d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/22/2024]
Abstract
An efficient, diversity-oriented synthesis of indole-1,2-fused 1,4-benzodiazepines, tetrahydro-β-carbolines, and 2,2'-bis(indolyl)methanes was established starting from tosyl-protected tryptamine. These diverse privileged skeletons were controllably constructed by adjusting different hydride donors and Brønsted acids. A variety of indole-1,2-fused 1,4-benzodiazepines were facilely accessed using benzaldehydes bearing cyclic amines as hydride donors via a cascade N-alkylation/dehydration/[1,5]-hydride transfer/Friedel-Crafts alkylation sequence. The reaction site could be switched when benzaldehydes bearing an alkoxy moiety as hydride donors were used for the generation of tetrahydro-β-carbolines. On the other hand, the switchable synthesis of 2,2'-bis(indolyl)methanes could be achieved as well by applying p-TsOH·H2O as a catalyst. The reactions feature mild conditions, simple and practical operation, excellent efficiency and the use of EtOH as a green solvent. Using the concept of diversity-oriented, reagent-based synthesis, the inexpensive feedstock tryptamine was efficiently converted to three different types of privileged scaffolds, which facilitates rapid compound library synthesis for accelerating drug discovery.
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Affiliation(s)
- Liang Wang
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China.
| | - Xiaopei Song
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China.
| | - Fengxia Guo
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China.
| | - Lubin Xu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China.
| | - Fangzhi Hu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China.
| | - Feng-Wei Guo
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China.
| | - Shuai-Shuai Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China.
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4
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Koyama R, Anada M, Sueki S, Makino K, Kojima T, Kawasaki-Takasuka T, Mori K. Divergent synthesis of multi-substituted phenanthrenes via an internal redox reaction/ring expansion sequence. Chem Commun (Camb) 2024; 60:3822-3825. [PMID: 38497170 DOI: 10.1039/d4cc00797b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/19/2024]
Abstract
We report an effective synthetic route to multi-substituted phenanthrenes via an internal redox reaction/ring expansion sequence. The interesting feature of the present system is that it allows for the divergent synthesis of the target skeleton depending on the selected Lewis acid catalyst. When benzylidene malonates with a cyclic structure at the ortho-position were treated with BF3·OEt2, three sequential processes (internal redox reaction/elimination of the alkoxy group/ring expansion) proceeded to give phenanthrene derivatives in which the alkoxycarbonyl (CO2R) group and the alkyl (R) group were in close proximity to each other, in good chemical yields. In sharp contrast, treatment with Bi(OTf)3 exclusively led to the formation of another type of phenanthrene, whose R group was positioned distal to the CO2R group.
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Affiliation(s)
- Ryosei Koyama
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan.
| | - Masahiro Anada
- Faculty of Pharmacy, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
- Research Institute of Pharmaceutical Sciences, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
| | - Shunsuke Sueki
- Faculty of Pharmacy, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
- Research Institute of Pharmaceutical Sciences, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
| | - Kosho Makino
- Faculty of Pharmacy, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
- Research Institute of Pharmaceutical Sciences, Musashino University, Nishitokyo, Tokyo 202-8585, Japan
| | - Tatsuhiro Kojima
- Department of Applied Chemistry, Kobe City College of Technology (KCCT), 8-3 Gakuen-Higashimachi, Nishi-ku, Kobe, 651-2194, Japan
| | - Tomoko Kawasaki-Takasuka
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan.
| | - Keiji Mori
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan.
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5
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Amano K, Kawasaki-Takasuka T, Mori K. Synthesis of Polysubstituted Naphthalenes by a Hydride Shift Mediated C-H Bond Functionalization/Aromatization Sequence. Org Lett 2024; 26:1824-1827. [PMID: 38416568 DOI: 10.1021/acs.orglett.3c04355] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2024]
Abstract
A synthetic strategy for forming multisubstituted naphthalenes based on hydride shift mediated C(sp3)-H bond functionalization was developed. This strategy consists of three successive transformations: (1) an intramolecular hydride shift mediated C(sp3)-H bond functionalization; (2) a decarboxylative fragmentation; and (3) an oxidation reaction. When benzylidene malonates having a 2-alkoxyethyl group at the ortho position were treated with a catalytic amount of Al(OTf)3, the hydride shift/cyclization reaction proceeded smoothly to afford tetralin derivatives in good chemical yields. The resulting tetralins were easily converted into naphthalenes by exposing them to modified Krapcho decarboxylation reaction conditions (LiCl, DMSO, and heating under an O2 atmosphere). The one-pot operation of these two reactions was also realized.
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Affiliation(s)
- Koutarou Amano
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Tomoko Kawasaki-Takasuka
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Keiji Mori
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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6
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Okawa H, Kawasaki-Takasuka T, Mori K. Silyl-Group Boosted Internal Redox Reaction: Hydride Shift from an Aliphatic Secondary Position for the Formation of Six- and Seven-Membered Carbocycles. Org Lett 2024; 26:1662-1666. [PMID: 38382544 DOI: 10.1021/acs.orglett.4c00140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
We report a hydride shift/cyclization reaction at the aliphatic secondary position (methylene group). The key to accomplishing this reaction was the employment of benzylidene malonate having a silyl group β to the hydride donor carbon. When the corresponding malonates were treated with a catalytic amount of Al(OTf)3, the [1,5]-hydride shift from the simple aliphatic secondary position proceeded smoothly to afford silyl-group substituted tetralin derivatives in excellent chemical yields (up to 98%). This reaction system was applied to the formation of seven-membered carbocycles via the [1,6]-hydride shift mediated process.
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Affiliation(s)
- Hiroto Okawa
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Tomoko Kawasaki-Takasuka
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Keiji Mori
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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7
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Ge JC, Wang Y, Guo FW, Kong X, Hu F, Li SS. Dearomatization of 3-Aminophenols for Synthesis of Spiro[chromane-3,1'-cyclohexane]-2',4'-dien-6'-ones via Hydride Transfer Strategy-Enabled [5+1] Annulations. Molecules 2024; 29:1012. [PMID: 38474524 DOI: 10.3390/molecules29051012] [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: 01/25/2024] [Revised: 02/16/2024] [Accepted: 02/21/2024] [Indexed: 03/14/2024] Open
Abstract
The Sc(OTf)3-catalyzed dearomative [5+1] annulations between readily available 3-aminophenols and O-alkyl ortho-oxybenzaldehydes were developed for synthesis of spiro[chromane-3,1'-cyclohexane]-2',4'-dien-6'-ones. The "two-birds-with-one-stone" strategy was disclosed by the dearomatization of phenols and direct α-C(sp3)-H bond functionalization of oxygen through cascade condensation/[1,5]-hydride transfer/dearomative-cyclization process. In addition, the antifungal activity assay and derivatizations of products were conducted to further enrich the utility of the structure.
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Affiliation(s)
- Jia-Cheng Ge
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
- Hailir Pesticides and Chemicals Group Co., Ltd., Qingdao 266109, China
| | - Yufeng Wang
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Feng-Wei Guo
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Xiangyun Kong
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Fangzhi Hu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Shuai-Shuai Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
- Hailir Pesticides and Chemicals Group Co., Ltd., Qingdao 266109, China
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8
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Garay-Talero A, Goulart TAC, Gallo RDC, Pinheiro RDC, Hoyos-Orozco C, Jurberg ID, Gamba-Sánchez D. An aza-Robinson Annulation Strategy for the Synthesis of Fused Bicyclic Amides: Synthesis of (±)-Coniceine and Quinolizidine. Org Lett 2023; 25:7940-7945. [PMID: 37877616 PMCID: PMC10630962 DOI: 10.1021/acs.orglett.3c02798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Indexed: 10/26/2023]
Abstract
An aza-Robinson annulation strategy is described using a NaOEt-catalyzed conjugate addition of cyclic imides onto vinyl ketones, followed by a TfOH-mediated intramolecular aldol condensation to afford densely functionalized fused bicyclic amides. The potential use of these amides in the synthesis of alkaloids is demonstrated by the sequential conversion of appropriate precursors to (±)-coniceine and quinolizidine in two additional steps, thus allowing their preparation in overall 40 and 44% yields, respectively.
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Affiliation(s)
- Alexander Garay-Talero
- Laboratory
of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, 111711 Bogota, Colombia
| | - Tales A. C. Goulart
- Institute
of Chemistry, State University of Campinas, Rua Monteiro Lobato 270, 13083-862 Campinas, SP, Brazil
| | - Rafael D. C. Gallo
- Institute
of Chemistry, State University of Campinas, Rua Monteiro Lobato 270, 13083-862 Campinas, SP, Brazil
| | - Roberto do C. Pinheiro
- Institute
of Chemistry, State University of Campinas, Rua Monteiro Lobato 270, 13083-862 Campinas, SP, Brazil
| | - Catalina Hoyos-Orozco
- Laboratory
of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, 111711 Bogota, Colombia
| | - Igor D. Jurberg
- Institute
of Chemistry, State University of Campinas, Rua Monteiro Lobato 270, 13083-862 Campinas, SP, Brazil
| | - Diego Gamba-Sánchez
- Laboratory
of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, 111711 Bogota, Colombia
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9
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Raison B, Dussart N, Gueyrard D. Modified Julia olefination on pyrrolidinone: Application to the total synthesis of indolizidine 209D. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200334] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bastien Raison
- ICBMS Equipe CO2-Glyco: Institut de Chimie et Biochimie Moleculaires et Supramoleculaires Equipe de Chimie Organique 2-Glycochimie Chemistry 1 rue Victor Grignard 69622 Villeurbanne FRANCE
| | - Nicolas Dussart
- ICBMS Equipe CO2-Glyco: Institut de Chimie et Biochimie Moleculaires et Supramoleculaires Equipe de Chimie Organique 2-Glycochimie Chemistry 1 rue Victor Grignard 69622 Villeurbanne FRANCE
| | - David Gueyrard
- UCBL LCO2 43 bd du 11 novembre 1918 69622 Villeurbanne FRANCE
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10
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Wu G, Yao Y, Li G, Zhang X, Qian H, Ma S. Enantioselective Allenation of Terminal Alkynes Catalyzed by Copper Halides of Mixed Oxidation States and Its Application to the Total Synthesis of Scorodonin. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202112427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Guolin Wu
- Research Center for Molecular Recognition and Synthesis Department of Chemistry Fudan University 220 Handan Lu Shanghai 200433 P. R. China
| | - Yuan Yao
- Research Center for Molecular Recognition and Synthesis Department of Chemistry Fudan University 220 Handan Lu Shanghai 200433 P. R. China
| | - Gen Li
- Research Center for Molecular Recognition and Synthesis Department of Chemistry Fudan University 220 Handan Lu Shanghai 200433 P. R. China
| | - Xue Zhang
- Research Center for Molecular Recognition and Synthesis Department of Chemistry Fudan University 220 Handan Lu Shanghai 200433 P. R. China
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 P. R. China
| | - Hui Qian
- Research Center for Molecular Recognition and Synthesis Department of Chemistry Fudan University 220 Handan Lu Shanghai 200433 P. R. China
| | - Shengming Ma
- Research Center for Molecular Recognition and Synthesis Department of Chemistry Fudan University 220 Handan Lu Shanghai 200433 P. R. China
- State Key Laboratory of Organometallic Chemistry Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Lu Shanghai 200032 P. R. China
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11
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Mori K. C(sp3)–H Bond Functionalization Mediated by Hydride Shift/Cyclization System. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2022. [DOI: 10.1246/bcsj.20210420] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Keiji Mori
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588
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12
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Wang Y, Lang Y, Li CJ, Zeng H. Visible-light-induced transition metal and photosensitizer free decarbonylative addition of amino-arylaldehydes to ketones. Chem Sci 2022; 13:698-703. [PMID: 35173934 PMCID: PMC8768876 DOI: 10.1039/d1sc06278f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Accepted: 12/18/2021] [Indexed: 12/26/2022] Open
Abstract
The decarbonylative-coupling reaction is generally promoted by transition metals (via organometallic complexes) or peroxides (via radical intermediates), often at high temperatures to facilitate the CO release. Herein, a visible-light-induced, transition metal and external photosensitizer free decarbonylative addition of benzaldehydes to ketones/aldehydes at room temperature is reported. Tertiary/secondary alcohols were obtained in moderate to excellent yields promoted by using CsF under mild conditions. The detailed mechanistic investigation showed that the reaction proceeded through photoexcitation–decarbonylation of the aldehyde to generate an aromatic anion, followed by its addition to ketones/aldehydes. The reaction mechanism was verified by the density functional theory (DFT) calculations. A visible-light-induced, transition-metal and external photosensitizer free decarbonylative addition of benzaldehydes to ketones/aldehydes via anion intermediates at room temperature is developed.![]()
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Affiliation(s)
- Yi Wang
- The State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, 222 Tianshui Road, Lanzhou, 730000, P. R. China
| | - Yatao Lang
- The State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, 222 Tianshui Road, Lanzhou, 730000, P. R. China
| | - Chao-Jun Li
- Department of Chemistry, FQRNT Centre for Green Chemistry and Catalysis, McGill University, 801 Sherbrooke St. West, Montreal, Quebec H3A 0B8, Canada
| | - Huiying Zeng
- The State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, 222 Tianshui Road, Lanzhou, 730000, P. R. China
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13
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Zhang BB, Peng S, Wang F, Lu C, Nie J, Chen Z, Yang G, Ma C. Borane-catalyzed cascade Friedel–Crafts alkylation/[1,5]-hydride transfer/Mannich cyclization to afford tetrahydroquinolines. Chem Sci 2022; 13:775-780. [PMID: 35173942 PMCID: PMC8768868 DOI: 10.1039/d1sc05629h] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Accepted: 12/20/2021] [Indexed: 12/15/2022] Open
Abstract
We report a redox-neutral annulation reaction of tertiary amines with electron-deficient alkynes under metal-free and oxidant-free conditions.
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Affiliation(s)
- Bei-Bei Zhang
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, P. R. China
| | - Shuo Peng
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, P. R. China
| | - Feiyi Wang
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, P. R. China
| | - Cuifen Lu
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, P. R. China
| | - Junqi Nie
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, P. R. China
| | - Zuxing Chen
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, P. R. China
| | - Guichun Yang
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, P. R. China
| | - Chao Ma
- Hubei Collaborative Innovation Centre for Advanced Organic Chemical Materials, College of Chemistry and Chemical Engineering, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei University, Wuhan, 430062, P. R. China
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14
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Hoshino D, Mori K. Divergent Access to Seven/Five-Membered Rings Based on [1,6]-Hydride Shift/Cyclization Process. Org Lett 2021; 23:9403-9407. [PMID: 34846903 DOI: 10.1021/acs.orglett.1c03523] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We have achieved a divergent access to seven/five-membered rings based on a [1,6]-hydride shift/cyclization process from benzylidenemalonate with an o-alkoxymethyl group. Whereas Yb(OTf)3 afforded benzoxepines (with a seven-membered ring) selectively, indanes (with a five-membered ring) were the main products when Sc(OTf)3 was employed.
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Affiliation(s)
- Daiki Hoshino
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Keiji Mori
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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15
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Wu G, Yao Y, Li G, Zhang X, Qian H, Ma S. EATA Reaction Catalyzed by Copper Halides of Mixed Oxidation States and Its Application to Total Synthesis of Scorodonin. Angew Chem Int Ed Engl 2021; 61:e202112427. [PMID: 34734475 DOI: 10.1002/anie.202112427] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Indexed: 11/10/2022]
Abstract
Naturally occurring conjugated allenynes are of general interest to the scientific community for their potent and various biological activities. The 1,5-H transfer of alka-1,4-diyn-3-yl amines would be one of the most straightforward yet challenging approach to this class of compounds since it may, in principle, form two regioisomeric products involving two different C-C triple bonds. Herein, a catalytic recipe of copper halides with mixed oxidation states, i.e., CuCl/CuBr 2 , has been identified to address the issues of the side reaction of conjugate addition and the selectivity of 1,5-H transfer of the key intermediate, alka-1,4-diyn-3-yl amines, in EATA (Enantioselective Allenation of Terminal Alkynes) reaction involving the conjugated 2-alkynals. This protocol could accommodate a wide range of functional groups providing a series of allenynes with a very high enantioselectivity (up to >99% ee). In addition, the enantioenriched allenynes can be readily transformed into various building blocks and applied to the highly enantioselective total synthesis of linear allenic natural product scorodonin for the first time. Mechanistic studies and DFT calculations elucidated the high regioselectivity for observed 1,5-H transfer within the intermediate of 1,4-diyn-3-yl amines. The calculated energy difference between two of the most stable transition states of 3.4 kcal/mol accounts for a selectivity of over 99:1, which is in perfect agreement with the experimental results.
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Affiliation(s)
- Guolin Wu
- Fudan University - Handan Campus: Fudan University, Department of Chemistry, CHINA
| | - Yuan Yao
- Fudan University - Handan Campus: Fudan University, Department of Chemistry, CHINA
| | - Gen Li
- Fudan University - Handan Campus: Fudan University, Department of Chemistry, CHINA
| | - Xue Zhang
- Fudan University - Handan Campus: Fudan University, Department of Chemistry, CHINA
| | - Hui Qian
- Fudan University - Handan Campus: Fudan University, Department of Chemistry, CHINA
| | - Shengming Ma
- SIOC/Zhejiang University, SKLOMC, 345 Lingling Lu, 200032, Shanghai, CHINA
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16
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Zhou R, Paradies J. Borane Catalyzed Redox Isomerization of 2‐Amino Chalcones: Hydride Abstraction or Hydride Migration? European J Org Chem 2021. [DOI: 10.1002/ejoc.202100883] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Rundong Zhou
- Chemistry Department Paderborn University Warburger Strasse 100 33098 Paderborn Germany
| | - Jan Paradies
- Chemistry Department Paderborn University Warburger Strasse 100 33098 Paderborn Germany
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17
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Valles DA, Dutta S, Paul A, Abboud KA, Ghiviriga I, Seidel D. α,α'-C-H Bond Difunctionalization of Unprotected Alicyclic Amines. Org Lett 2021; 23:6367-6371. [PMID: 34323490 PMCID: PMC8609614 DOI: 10.1021/acs.orglett.1c02187] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A simple one-pot procedure enables the sequential, regioselective, and diastereoselective introduction of the same or two different substituents to the α- and α'-positions of unprotected azacycles. Aryl, alkyl, and alkenyl substituents are introduced via their corresponding organolithium compounds. The scope of this transformation includes pyrrolidines, piperidines, azepanes, and piperazines.
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Affiliation(s)
- Daniel A. Valles
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Subhradeep Dutta
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Anirudra Paul
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Khalil A. Abboud
- Center for X-ray Crystallography, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Ion Ghiviriga
- Center for NMR Spectroscopy, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Daniel Seidel
- Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
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18
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Synthesis of spiro[imidazole-4,3'-quinolin]ones from [2-(dimethylamino)benzylidene]-2-(methylsulfanyl)imidazolones. Chem Heterocycl Compd (N Y) 2021. [DOI: 10.1007/s10593-021-02969-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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19
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Wicker G, Schoch R, Paradies J. Diastereoselective Synthesis of Dihydro-quinolin-4-ones by a Borane-Catalyzed Redox-Neutral endo-1,7-Hydride Shift. Org Lett 2021; 23:3626-3630. [PMID: 33843243 DOI: 10.1021/acs.orglett.1c01018] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The borane-catalyzed synthesis of dihydroquinoline-4-ones is developed. The amino-substituted chalcones undergo a 1,7-hydride shift upon Lewis acid activation to form a zwitterionic iminium enolate, which collapses to the dihydroquinoline-4-one scaffold. The reaction proceeds in high yields (75-99%) with an excellent diastereoselectivity of up to >99:1 (cis:trans). The reaction mechanism is investigated by kinetic, isotope labeling, and computational experiments.
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Affiliation(s)
- Garrit Wicker
- Paderborn University, Chemistry Department, Warburger-Strasse 100, D-33098 Paderborn, Germany
| | - Roland Schoch
- Paderborn University, Chemistry Department, Warburger-Strasse 100, D-33098 Paderborn, Germany
| | - Jan Paradies
- Paderborn University, Chemistry Department, Warburger-Strasse 100, D-33098 Paderborn, Germany
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20
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Bhowmik A, Das S, Sarkar W, Saidalavi KM, Mishra A, Roy A, Deb I. Diastereoselective Spirocyclization via Intramolecular C(
sp
3
)−H Bond Functionalization Triggered by Sequential [1,5]‐Hydride Shift/Cyclization Process: Approach to Spiro‐tetrahydroquinolines. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202001011] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Arup Bhowmik
- Organic and Medicinal Chemistry Division Indian Institute of Chemical Biology 4-Raja S. C. Mullick Road, Jadavpur Kolkata 700032 India
| | - Sumit Das
- Organic and Medicinal Chemistry Division Indian Institute of Chemical Biology 4-Raja S. C. Mullick Road, Jadavpur Kolkata 700032 India
- Academy of Scientific and Innovative Research (AcSIR). Kamla Nehru Nagar 201002 Ghaziabad India
| | - Writhabrata Sarkar
- Organic and Medicinal Chemistry Division Indian Institute of Chemical Biology 4-Raja S. C. Mullick Road, Jadavpur Kolkata 700032 India
| | - K. M. Saidalavi
- Organic and Medicinal Chemistry Division Indian Institute of Chemical Biology 4-Raja S. C. Mullick Road, Jadavpur Kolkata 700032 India
| | - Aniket Mishra
- Organic and Medicinal Chemistry Division Indian Institute of Chemical Biology 4-Raja S. C. Mullick Road, Jadavpur Kolkata 700032 India
| | - Anupama Roy
- Organic and Medicinal Chemistry Division Indian Institute of Chemical Biology 4-Raja S. C. Mullick Road, Jadavpur Kolkata 700032 India
| | - Indubhusan Deb
- Organic and Medicinal Chemistry Division Indian Institute of Chemical Biology 4-Raja S. C. Mullick Road, Jadavpur Kolkata 700032 India
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21
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Liu S, Wang H, Wang B. Catalyst-free construction of spiro [benzoquinolizidine-chromanones] via a tandem condensation/1,5-hydride transfer/cyclization process. Org Biomol Chem 2020; 18:8839-8843. [PMID: 33104768 DOI: 10.1039/d0ob01887b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A catalyst-free tandem 1,5-hydride shift/cyclization process to form spiro [benzoquinolizidine-chromanones] is developed, which features high atom- and step-economy, high levels of stereocontrol, mild conditions, and a simple workup process. A series of new polycyclic spiro [benzoquinolizidine-chromanones] were obtained in high yields with excellent diastereoselectivities (up to 91% yield, >20 : 1 dr).
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Affiliation(s)
- Siyuan Liu
- Shandong Provincial Key Laboratory of Molecular Engineering, School of Chemistry and Chemical Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan, 250353, P. R. China.
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22
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Hoshino D, Mori K. Rapid access to 3-indolyl-1-trifluoromethyl-isobenzofurans by hybrid use of Lewis/Brønsted acid catalysts. Org Biomol Chem 2020; 18:6602-6606. [PMID: 32815970 DOI: 10.1039/d0ob01582b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We report herein a rapid access to 3-indolyl-1-trifluoromethyl-isobenzofurans via a [1,4]-hydride shift/cyclizatin/intermolecular nucleophilic addition reaction sequence. In this process, a Lewis acid promoted internal redox reaction ([1,4]-hydride shift/cyclization) followed by a Brønsted acid promoted intermolecular reaction (generation of cyclic oxonium cation/intermolecular Friedel-Crafts reaction) occurred to give various 3-indolyl-1-trifluoromethyl-isobenzofurans in good chemical yields.
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Affiliation(s)
- Daiki Hoshino
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan.
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23
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Yokoo K, Sakai D, Mori K. Highly Stereoselective Synthesis of Fused Tetrahydropyrans via Lewis-Acid-Promoted Double C(sp3)–H Bond Functionalization. Org Lett 2020; 22:5801-5805. [DOI: 10.1021/acs.orglett.0c01867] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kazuma Yokoo
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Dan Sakai
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Keiji Mori
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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24
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Vidhani DV, Gillett JR, Cusido Y, Alabugin IV. [1,5]-Sigmatropic Shifts Regulated by Built-in Frustration. J Phys Chem A 2020; 124:6016-6028. [DOI: 10.1021/acs.jpca.0c03933] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Dinesh V. Vidhani
- Department of Math & Natural Science, Miami Dade College, Miami, Florida, United States
| | - Jared R. Gillett
- Department of Chemistry & Biochemistry, University of Wisconsin, La Crosse, Wisconsin, United States
| | - Yanet Cusido
- Department of Math & Natural Science, Miami Dade College, Miami, Florida, United States
| | - Igor V. Alabugin
- Department of Chemistry & Biochemistry, Florida State University, Tallahassee, Florida, United States
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25
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Mandal S, Saha S, Jana CK. Diastereoselective and Reversed Regioselective Annulations of N-Alkyl Anilines to Julolidines and Lilolidines. Org Lett 2020; 22:4883-4887. [PMID: 32519864 DOI: 10.1021/acs.orglett.0c01731] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
A three-component annulation reaction of N-alkyl anilines, cyclic 1,3-dicarbonyl compounds, and aryl aldehydes to julolidines and lilolidines is reported. The 6π-electrocyclization enabled the annulation to proceed with reversed regioselectivity as compared with the annulation that occurs in the Povarov reaction. Both cyclic and acyclic N-alkyl anilines participated in the reaction to provide a wide range of julolidines and lilolidines as the single regio- and diastereoisomers in good to excellent yields.
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Affiliation(s)
- Sumana Mandal
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 780139, India
| | - Subhajit Saha
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 780139, India
| | - Chandan K Jana
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam 780139, India
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26
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Zhang Y, Li S, Zhu Y, Yang X, Zhou H, Li Y. Visible Light-Induced Oxidative Cross Dehydrogenative Coupling of Glycine Esters with β-Naphthols: Access to 1,3-Benzoxazines. J Org Chem 2020; 85:6261-6270. [DOI: 10.1021/acs.joc.9b01440] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Yuan Zhang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Shilin Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Yin Zhu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Xiaorong Yang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Huang Zhou
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
| | - Ying Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, People’s Republic of China
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27
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Duan K, An XD, Li LF, Sun LL, Qiu B, Li XJ, Xiao J. Hydride Transfer Initiated Redox-Neutral Cascade Cyclizations of Aurones: Facile Access to [6,5] Spirocycles. Org Lett 2020; 22:2537-2541. [PMID: 32186385 DOI: 10.1021/acs.orglett.0c00309] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Reported herein is the hydride transfer initiated redox-neutral cascade cyclizations of aurones, providing a variety of [6,5] spiro-heterocycles in satisfactory yields and good diastereoselectivities.
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Affiliation(s)
- Kang Duan
- School of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao, 266109, China
| | - Xiao-De An
- School of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao, 266109, China
| | - Long-Fei Li
- School of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao, 266109, China
| | - Lian-Lian Sun
- The Affiliated Hospital of Huizhou Health Sciences Polytechnic, Huizhou, 516025, China
| | - Bin Qiu
- School of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao, 266109, China
| | - Xian-Jiang Li
- Shandong Kangqiao Biotechnology Co. Ltd., Binzhou, 256500, China
| | - Jian Xiao
- School of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao, 266109, China.,School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao, 266109, China
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28
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Roy SK, Purkait A, Aziz SMT, Jana CK. Acid mediated coupling of aliphatic amines and nitrosoarenes to indoles. Chem Commun (Camb) 2020; 56:3167-3170. [PMID: 32065174 DOI: 10.1039/c9cc09616g] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Traditionally, amines react with nitrosoarenes to provide the corresponding imines or azo compounds. Herein, we report an acid mediated annulation reaction of aliphatic amines and nitrosoarenes to provide indole derivatives. The elusive direct annulation of aliphatic amines and nitrosoarenes via simultaneous C-C and C-N bond formation was achieved under metal free conditions. This conceptually novel method for indole synthesis does not require pre-functionalization steps for the new C-C and C-N bond formation. The method has been applied for an elegant synthesis of nor-neocryptolepine and neocryptolepine.
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29
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Shen YB, Wang LX, Sun YM, Dong FY, Yu L, Liu Q, Xiao J. Hexafluoroisopropanol-Mediated Redox-Neutral α-C(sp 3)-H Functionalization of Cyclic Amines via Hydride Transfer. J Org Chem 2020; 85:1915-1926. [PMID: 31823616 DOI: 10.1021/acs.joc.9b02606] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Hexafluoroisopropanol has been demonstrated as the versatile promoter for redox-neutral α-C(sp3)-H functionalization of cyclic amines via the cascade [1,5]-hydride transfer/cyclization strategy. A wide range of cyclic amines are functionalized into bioactive tetrahydroquinolines, quinazolines, benzoxazines, and benzotriazepines in moderate to excellent yields. This protocol features additive-free conditions, operational simplicity, and wide substrate scope.
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Affiliation(s)
| | | | | | | | | | - Qing Liu
- College of Chemical and Environmental Engineering , Shandong University of Science and Technology , Qingdao 266590 , China
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30
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Zhou L, An XD, Yang S, Li XJ, Shao CL, Liu Q, Xiao J. Organocatalytic Cascade β-Functionalization/Aromatization of Pyrrolidines via Double Hydride Transfer. Org Lett 2020; 22:776-780. [DOI: 10.1021/acs.orglett.9b03918] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Lan Zhou
- School of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Xiao-De An
- School of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Shuo Yang
- School of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Xian-Jiang Li
- Shandong Kangqiao Biotechnology Co., Ltd., Binzhou 256500, China
| | - Chang-Lun Shao
- Key Laboratory of Marine Drugs, The Ministry of Education of China, School of Medicine and Pharmacy, Ocean University of China, Qingdao 266003, China
| | - Qing Liu
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
| | - Jian Xiao
- Shandong Province Key Laboratory of Applied Mycology, School of Chemistry and Pharmaceutical Sciences, School of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China
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31
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Yokoo K, Mori K. Expeditious Synthesis of Multisubstituted Quinolinone Derivatives Based on Ring Recombination Strategy. Org Lett 2020; 22:244-248. [PMID: 31834806 DOI: 10.1021/acs.orglett.9b04224] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We achieved a concise construction of 3-substituted quinolinone derivatives based on a ring recombination strategy. In this process, seven transformations involving two types of cyclization proceeded in one pot to afford various quinolinone derivatives in good to excellent chemical yields (up to 98%).
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Affiliation(s)
- Kazuma Yokoo
- Department of Applied Chemistry , Graduate School of Engineering, Tokyo University of Agriculture and Technology , 2-24-16 Nakacho , Koganei , Tokyo 184-8588 , Japan
| | - Keiji Mori
- Department of Applied Chemistry , Graduate School of Engineering, Tokyo University of Agriculture and Technology , 2-24-16 Nakacho , Koganei , Tokyo 184-8588 , Japan
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32
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Quevedo-Acosta Y, Jurberg ID, Gamba-Sánchez D. Activating Imides with Triflic Acid: A General Intramolecular Aldol Condensation Strategy Toward Indolizidine, Quinolizidine, and Valmerin Alkaloids. Org Lett 2020; 22:239-243. [PMID: 31845813 DOI: 10.1021/acs.orglett.9b04199] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A simple, inexpensive, step economic, and highly modular synthetic strategy to access izidine alkaloids is described. The key step is a TfOH-promoted intramolecular aldol condensation between enol and cyclic imide moieties. This cyclization strategy can be employed within an aza-Robinson annulation framework and represents a general tool to build fused bicyclic amines. To illustrate the power of this method, we describe the preparation of (±)-coniceine, (±)-quinolizidine, (±)-tashiromine, (±)-epilupinine, and the core of (±)-valmerins.
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Affiliation(s)
- Yovanny Quevedo-Acosta
- Institute of Chemistry , State University of Campinas , Rua Monteiro Lobato 270 , 13083-862 Campinas , São Paulo , Brazil
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department , Universidad de los Andes , Cra 1 No. 18A-12 Q:305 , 111711 Bogotá , Colombia
| | - Igor D Jurberg
- Institute of Chemistry , State University of Campinas , Rua Monteiro Lobato 270 , 13083-862 Campinas , São Paulo , Brazil
| | - Diego Gamba-Sánchez
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department , Universidad de los Andes , Cra 1 No. 18A-12 Q:305 , 111711 Bogotá , Colombia
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33
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Kataoka M, Otawa Y, Ido N, Mori K. Highly Diastereoselective Synthesis of Medium-Sized Carbocycle-Fused Piperidines via Sequential Hydride Shift Triggered Double C(sp3)–H Bond Functionalization. Org Lett 2019; 21:9334-9338. [DOI: 10.1021/acs.orglett.9b03498] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Miyabi Kataoka
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Yuna Otawa
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Natsuki Ido
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
| | - Keiji Mori
- Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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34
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Wang S, Shen YB, Li LF, Qiu B, Yu L, Liu Q, Xiao J. N-Alkylation-Initiated Redox-Neutral [5 + 2] Annulation of 3-Alkylindoles with o-Aminobenzaldehydes: Access to Indole-1,2-Fused 1,4-Benzodiazepines. Org Lett 2019; 21:8904-8908. [DOI: 10.1021/acs.orglett.9b03011] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Shuai Wang
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Yao-Bin Shen
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Long-Fei Li
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Bin Qiu
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Liping Yu
- College of Landscape Architecture and Forestry, Qingdao Agricultural University, Qingdao 266109, China
| | - Qing Liu
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
| | - Jian Xiao
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
- College of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China
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35
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Anderson JC, Chang CH, Corpinot MK, Nunn M, Ware OJ. Investigation of the [1,5]-hydride shift as a route to nitro-Mannich cyclisations. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130663] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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36
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Zhou L, Shen YB, An XD, Li XJ, Li SS, Liu Q, Xiao J. Redox-Neutral β-C(sp 3)-H Functionalization of Cyclic Amines via Intermolecular Hydride Transfer. Org Lett 2019; 21:8543-8547. [PMID: 31633932 DOI: 10.1021/acs.orglett.9b03004] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we report the first redox-neutral and transition-metal-free β-C(sp3)-H functionalization of cyclic amines via a consecutive intermolecular hydride transfer process. A series of N-aryl pyrrolidines and N-aryl 1,2,3,4-tetrahydropyridines decorated with CF3 and carboxylic ester functionalities are directly accessed in good yields from pyrrolidines and piperidines. This work pushes forward the application of the intermolecular hydride transfer strategy in one-step assembly of molecular complexity.
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Affiliation(s)
- Lan Zhou
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao , 266109 , China
| | - Yao-Bin Shen
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao , 266109 , China
| | - Xiao-De An
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao , 266109 , China
| | - Xian-Jiang Li
- Shandong Kangqiao Biotechnology Co. Ltd. , Binzhou , 256500 , China
| | - Shuai-Shuai Li
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao , 266109 , China
| | - Qing Liu
- College of Chemical and Environmental Engineering , Shandong University of Science and Technology , Qingdao 266590 , China
| | - Jian Xiao
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao , 266109 , China.,College of Marine Science and Engineering , Qingdao Agricultural University , Qingdao 266109 , China
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37
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Shen YB, Li LF, Xiao MY, Yang JM, Liu Q, Xiao J. Redox-Neutral Cascade Dearomatization of Indoles via Hydride Transfer: Divergent Synthesis of Tetrahydroquinoline-Fused Spiroindolenines. J Org Chem 2019; 84:13935-13947. [DOI: 10.1021/acs.joc.9b02110] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
| | | | | | | | - Qing Liu
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
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38
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Bai G, Dong F, Xu L, Liu Y, Wang L, Li SS. Controllable Syntheses of Spiroindolenines and Benzazepinoindoles via Hexafluoroisopropanol-Mediated Redox-Neutral Cascade Process. Org Lett 2019; 21:6225-6230. [DOI: 10.1021/acs.orglett.9b02051] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Guangxian Bai
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Fengying Dong
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Lubin Xu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Yongjun Liu
- College of Chemistry and Molecular Engineering, Qingdao University of Science and Technology, Zhengzhou Rd. #53, Qingdao 266042, P. R. China
| | - Liang Wang
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Shuai-Shuai Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
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39
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Chu X, Ge D, Wang M, Rao W, Loh T, Shen Z. Chemo‐ and Regioselective Ring Construction Driven by Visible‐Light Photoredox Catalysis: an Access to Fluoroalkylated Oxazolidines Featuring an All‐Substituted Carbon Stereocenter. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900585] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Xue‐Qiang Chu
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
| | - Danhua Ge
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
| | - Mao‐Lin Wang
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
| | - Weidong Rao
- Jiangsu Key Laboratory of Biomass-based Green Fuels and Chemicals, College of Chemical Engineering Nanjing Forestry University Nanjing 210037 People's Republic of China
| | - Teck‐Peng Loh
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore
| | - Zhi‐Liang Shen
- Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Center for Advanced Materials Nanjing Tech University Nanjing 211816 People's Republic of China
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40
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Zhu S, Chen C, Duan K, Sun YM, Li SS, Liu Q, Xiao J. Cascade [1,5]-Hydride Transfer/Cyclization for Synthesis of [3,4]-Fused Oxindoles. J Org Chem 2019; 84:8440-8448. [PMID: 31135154 DOI: 10.1021/acs.joc.9b00489] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The scandium-catalyzed redox-neutral cascade [1,5]-hydride transfer/cyclization between C4-amine-substituted isatins and 1,3-dicarbonyl compounds has been developed. This protocol enabled the synthesis of tricyclic [3,4]-fused oxindoles in good to high yields and excellent diastereoselectivities, featuring high atom- and step economy as well as good functional group tolerance.
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Affiliation(s)
- Shuai Zhu
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao 266109 , China
| | - Chunqi Chen
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao 266109 , China
| | - Kang Duan
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao 266109 , China
| | - Yun-Ming Sun
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao 266109 , China
| | - Shuai-Shuai Li
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao 266109 , China
| | - Qing Liu
- College of Chemical and Environmental Engineering , Shandong University of Science and Technology , Qingdao 266590 , China
| | - Jian Xiao
- Shandong Province Key Laboratory of Applied Mycology, College of Chemistry and Pharmaceutical Sciences , Qingdao Agricultural University , Qingdao 266109 , China.,College of Marine Science and Engineering , Qingdao Agricultural University , Qingdao 266109 , China
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41
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Borra S, Borkotoky L, Newar UD, Kalwar A, Das B, Maurya RA. Visible light triggered photo-decomposition of vinyl azides to (E)-stilbene derivatives via 1,2-acyl migration. Org Biomol Chem 2019; 17:5971-5981. [PMID: 31165843 DOI: 10.1039/c9ob01035a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient photocatalyst-free visible light assisted synthetic route to various (E)-stilbene derivatives was developed. The reaction proceeds through a denitrogenative photo-decomposition of vinyl azides into 2H-azirines followed by neighboring amino group assisted ring opening, 1,2-acyl migration and enolization. The photochemical reaction offers light harvesting without any photocatalyst to access a wide variety of substituted (E)-stilbenes in moderate to high yields.
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Affiliation(s)
- Satheesh Borra
- Applied Organic Chemistry Group, Chemical Sciences & Technology Division, CSIR-North East Institute of Science & Technology (NEIST), Jorhat-785006, Assam, India.
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42
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Zhao S, Wang X, Wang P, Wang G, Zhao W, Tang X, Guo M. BF3·OEt2-Promoted Propargyl Alcohol Rearrangement/[1,5]-Hydride Transfer/Cyclization Cascade Affording Tetrahydroquinolines. Org Lett 2019; 21:3990-3993. [DOI: 10.1021/acs.orglett.9b01153] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shuang Zhao
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Xiaoyang Wang
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Pengfei Wang
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Guangwei Wang
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Wentao Zhao
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Xiangyang Tang
- Tianjin Key Laboratory of Molecular Optoelectronic Science, Department of Chemistry, School of Science, Tianjin University, Tianjin 300072, P. R. China
| | - Minjie Guo
- Institute for Molecular Design and Synthesis, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin 300072, P. R. China
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43
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Tamura R, Kitamura E, Tsutsumi R, Yamanaka M, Akiyama T, Mori K. Diastereoselective Synthesis of CF 3-Substituted Spiroisochromans by [1,5]-Hydride Shift/Cyclization/Intramolecular Friedel-Crafts Reaction Sequence. Org Lett 2019; 21:2383-2387. [PMID: 30882229 DOI: 10.1021/acs.orglett.9b00668] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Developed herein is a diastereoselective synthesis of CF3-substituted spiroisochromans via C(sp3)-H bond functionalization involving sequential transformations ([1,5]-hydride shift/cyclization/elimination of MeOH/intramolecular Friedel-Crafts reaction).
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Affiliation(s)
- Risa Tamura
- Department of Applied Chemistry, Graduate School of Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Nakacho , Koganei , Tokyo 184-8588 , Japan
| | - Eriko Kitamura
- Department of Chemistry, Faculty of Science , Gakushuin University , Mejiro, Toshima-ku , Tokyo 171-8588 , Japan
| | - Ryosuke Tsutsumi
- Department of Chemistry and Research Center for Smart Molecules , Rikkyo University , 3-34-1 Nishi-Ikebukuro , Toshima-ku , Tokyo 171-8501 , Japan
| | - Masahiro Yamanaka
- Department of Chemistry and Research Center for Smart Molecules , Rikkyo University , 3-34-1 Nishi-Ikebukuro , Toshima-ku , Tokyo 171-8501 , Japan
| | - Takahiko Akiyama
- Department of Chemistry, Faculty of Science , Gakushuin University , Mejiro, Toshima-ku , Tokyo 171-8588 , Japan
| | - Keiji Mori
- Department of Applied Chemistry, Graduate School of Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Nakacho , Koganei , Tokyo 184-8588 , Japan
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44
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Li SS, Zhu S, Chen C, Duan K, Liu Q, Xiao J. Hydride Transfer Involved Redox-Neutral Cascade Cyclizations for Construction of Spirocyclic Bisoxindoles Featuring a [3,4]-Fused Oxindole Moiety. Org Lett 2019; 21:1058-1062. [DOI: 10.1021/acs.orglett.8b04100] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shuai-Shuai Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Shuai Zhu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Chunqi Chen
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Kang Duan
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Qing Liu
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
| | - Jian Xiao
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
- College of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China
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45
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Chan JZ, Chang Y, Wasa M. B(C 6F 5) 3-Catalyzed C-H Alkylation of N-Alkylamines Using Silicon Enolates without External Oxidant. Org Lett 2019; 21:984-988. [PMID: 30693779 DOI: 10.1021/acs.orglett.8b03959] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An efficient method for the coupling of N-alkylamines with silicon enolates to generate β-amino carbonyl compounds is disclosed. These reactions proceed by activation of α-amino C-H bonds by B(C6F5)3, which likely generates a "frustrated" acid/base complex in the presence of large N-alkylamines. The transformation requires no external oxidant and releases hydrosilane as a byproduct. The utility of this method is demonstrated in the late-stage functionalization of bioactive molecules such as citalopram, atomoxetine, and fluoxetine.
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Affiliation(s)
- Jessica Z Chan
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Yejin Chang
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Masayuki Wasa
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
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46
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Lv X, Hu F, Duan K, Li SS, Liu Q, Xiao J. Aromatization-Driven Cascade [1,5]-Hydride Transfer/Spirocyclization Promoted by Fluorinated Alcohols. J Org Chem 2019; 84:1833-1844. [DOI: 10.1021/acs.joc.8b02754] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Xintong Lv
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Fangzhi Hu
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Kang Duan
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Shuai-Shuai Li
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
| | - Qing Liu
- College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, China
| | - Jian Xiao
- College of Chemistry and Pharmaceutical Sciences, Qingdao Agricultural University, Qingdao 266109, China
- College of Marine Science and Engineering, Qingdao Agricultural University, Qingdao 266109, China
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47
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Otawa Y, Mori K. Construction of seven- and eight-membered carbocycles by Lewis acid catalyzed C(sp3)–H bond functionalization. Chem Commun (Camb) 2019; 55:13856-13859. [DOI: 10.1039/c9cc08074k] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Concise construction of seven- or eight-membered carbocycles was accomplished by Lewis acid catalyzed C(sp3)–H bond functionalization.
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Affiliation(s)
- Yuna Otawa
- Department of Applied Chemistry
- Graduate School of Engineering
- Tokyo University of Agriculture and Technology
- Tokyo 184-8588
- Japan
| | - Keiji Mori
- Department of Applied Chemistry
- Graduate School of Engineering
- Tokyo University of Agriculture and Technology
- Tokyo 184-8588
- Japan
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48
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Borpatra PJ, Deka B, Deb ML, Baruah PK. Recent advances in intramolecular C–O/C–N/C–S bond formationviaC–H functionalization. Org Chem Front 2019. [DOI: 10.1039/c9qo00863b] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review presents the construction of C–X bonds (X = O/N/S) by using intramolecular C–H functionalization for the synthesis of heterocyclic compounds.
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Affiliation(s)
- Paran J. Borpatra
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Bhaskar Deka
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Mohit L. Deb
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
| | - Pranjal K. Baruah
- Department of Applied Sciences
- GUIST
- Gauhati University
- Guwahati-781014
- India
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49
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Tian JJ, Zeng NN, Liu N, Tu XS, Wang XC. Intramolecular Cyclizations of Vinyl-Substituted N,N-Dialkyl Arylamines Enabled by Borane-Assisted Hydride Transfer. ACS Catal 2018. [DOI: 10.1021/acscatal.8b04485] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Jun-Jie Tian
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ning-Ning Zeng
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Ning Liu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xian-Shuang Tu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Xiao-Chen Wang
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, China
- Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China
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50
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Copper-catalyzed intramolecular redox reaction: Asymmetric synthesis of chiral 2-(1H-pyrrol-1-yl)-mandelic acid esters. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.11.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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