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De S, Chowdhury C. Substrate-Controlled Product Divergence in Iron(III)-Catalyzed Reactions of Propargylic Alcohols: Easy Access to Spiro-indenyl 1,4-Benzoxazines and 2-(2,2-Diarylvinyl)quinoxalines. Chemistry 2023; 29:e202203993. [PMID: 36651187 DOI: 10.1002/chem.202203993] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 01/17/2023] [Accepted: 01/17/2023] [Indexed: 01/19/2023]
Abstract
We report herein unprecedented cascade reactions of O-propargyl-N-tosyl-amino phenols with 10 mol% FeCl3 in DCE at room temperature for 0.67-3 h to form spiro-indenyl 1,4-benzoxazines with 38-89 % yield. Replacing the substrates' oxygen atom by a N-tosylimine group followed by treatment with the same catalyst and solvent at 80 °C produced 2-(2,2-diarylvinyl)quinoxalines in 12-20 h with up to 62 % yield. Mechanistic understanding provided an insight into the transformations. The use of simple substrates and an environmentally benign low-cost catalyst, broad substrate scope and tolerance of diverse functional groups makes the methodology inherently attractive.
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Affiliation(s)
- Sukanya De
- Organic & Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata, 700032, India
| | - Chinmay Chowdhury
- Organic & Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4, Raja S. C. Mullick Road, Kolkata, 700032, India
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2
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Li M, Zhang R, Gao Q, Jiang H, Lei M, Wu W. Divergent Synthesis of Fused Tetracyclic Heterocycles from Diarylalkynes Enabled by the Selective Insertion of Isocyanide. Angew Chem Int Ed Engl 2022; 61:e202208203. [DOI: 10.1002/anie.202208203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Meng Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510641 China
| | - Ruixue Zhang
- State Key Laboratory of Chemical Resource Engineering Institute of Computational Chemistry College of Chemistry Beijing University of Chemical Technology Beijing 10019 China
| | - Qiushan Gao
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510641 China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510641 China
| | - Ming Lei
- State Key Laboratory of Chemical Resource Engineering Institute of Computational Chemistry College of Chemistry Beijing University of Chemical Technology Beijing 10019 China
| | - Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510641 China
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3
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Li M, Zhang R, Gao Q, Jiang H, Lei M, Wu W. Divergent Synthesis of Fused Tetracyclic Heterocycles from Diarylalkynes Enabled by the Selective Insertion of Isocyanide. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202208203] [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]
Affiliation(s)
- Meng Li
- South China University of Technology School of Chemistry and Chemical Engineering CHINA
| | - Ruixue Zhang
- Beijing University of Chemical Technology College of Chemistry CHINA
| | - Qiushan Gao
- South China University of Technology School of Chemistry and Chemical Engineering CHINA
| | - Huanfeng Jiang
- South China University of Technology School of Chemistry and Chemical Engineering CHINA
| | - Ming Lei
- Beijing University of Chemical Technology College of Chemistry CHINA
| | - Wanqing Wu
- South China University of Technology School of Chemistry & Chemical Engineering No. 381, Wushan Road, Tianhe Strict, 510640 Guangzhou CHINA
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4
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Barotcu AZ, Karanfil A, Şahin E, Kelebekli L. Stereoselective synthesis of novel bis-homoinositols with bicyclo[4.2.0]octane motifs. Carbohydr Res 2022; 519:108611. [PMID: 35716487 DOI: 10.1016/j.carres.2022.108611] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 06/03/2022] [Accepted: 06/06/2022] [Indexed: 11/29/2022]
Abstract
Starting from cyclooctatetraene, bis-homoconduritols with cis-inositol and allo-inositol (or bicyclo[4.2.0]octane motif) structures were synthesized. Photooxygenation of trans-7,8-dibromo-bicyclo[4.2.0]octa-2,4-diene allowed the preparation of tricyclic endoperoxide. The compound diacetate was obtained by reduction of endoperoxide with thiourea followed by acetylation reaction. Removal of halides with zinc dust in acetic acid yielded the dien-diacetate, a key compound of the designed molecules. OsO4 oxidation of diendiacetate followed by acetylation gave the corresponding hexaacetates. Finally, the novel desired bis-homoinositols were obtained in high yield by the ammonolysis of acetate groups. The structures of all synthesized compounds were characterized by spectroscopic methods.
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Affiliation(s)
- Ayşenur Zeren Barotcu
- Department of Chemistry, Faculty of Sciences and Arts, Ordu University, 52200, Ordu, Turkey
| | - Abdullah Karanfil
- Department of Chemistry, Faculty of Sciences and Arts, Ordu University, 52200, Ordu, Turkey
| | - Ertan Şahin
- Department of Chemistry, Faculty of Sciences, Ataturk University, 25240, Erzurum, Turkey
| | - Latif Kelebekli
- Department of Chemistry, Faculty of Sciences and Arts, Ordu University, 52200, Ordu, Turkey.
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5
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Structural analysis of halogenated bicyclo[4.2.0] inositols, biological activities and molecular docking studies. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2021.131357] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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6
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Ponikiewski Ł, Sowa S. Ring Opening of Triflates Derived from Benzophospholan-3-one Oxides by Aryl Grignard Reagents as a Route to 2-Ethynylphenyl(diaryl)phosphine Oxides. J Org Chem 2021; 86:14928-14941. [PMID: 34699223 PMCID: PMC8576819 DOI: 10.1021/acs.joc.1c01629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new simple method for the synthesis of 2-ethynylphenyl(diaryl)phosphine oxides via ring opening of benzophosphol-3-yl triflates has been developed. This process occurs via nucleophilic attack of a Grignard reagent at the phosphorus center, which results in ring opening and cleavage of a leaving group. The reaction proceeds under mild conditions and, within 15-60 min, leads to a library of previously unavailable 2-ethynylphenylphosphine oxides in yields up to 98%.
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Affiliation(s)
- Łukasz Ponikiewski
- Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, G. Narutowicza St. 11/12, Gdańsk PL-80-233, Poland
| | - Sylwia Sowa
- Department of Organic Chemistry, Faculty of Chemistry, Institute of Chemical Sciences, Marie Curie-Sklodowska University in Lublin, 33 Gliniana Street, Lublin PL-20-614, Poland
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7
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Mondal D, Pal G, Chowdhury C. Palladium(0)-catalysed regioselective cyclisations of 2-amino(tosyl) benzamides/sulphonamides: the stereoselective synthesis of 3-ylidene-[1,4]benzodiazepin-5-ones/benzo[ f][1,2,5]thiadiazepine-1,1-dioxides. Chem Commun (Camb) 2021; 57:5462-5465. [PMID: 33954319 DOI: 10.1039/d1cc00793a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The Pd(0) catalysed cyclisation reactions between tert-butyl propargyl carbonates and 2-aminotosyl benzamides or sulphonamides deliver 1,4-benzodiazepin-5-ones or sultam derivatives, key components of many biologically active compounds. But 2-amino benzamides/sulphonamides require propargyl carbonates substituted at acetylenic carbon to undergo the reaction resulting in the stereoselective formation of the said products.
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Affiliation(s)
- Debasmita Mondal
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata-70032, India.
| | - Gargi Pal
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata-70032, India.
| | - Chinmay Chowdhury
- Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, Kolkata-70032, India.
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8
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Li L, Li X, Wang W, He Q, Fan R. Synthesis of 4-Alkylindoles from 2-Alkynylanilines via Dearomatization- and Aromatization-Triggered Alkyl Migration. Org Lett 2021; 23:2130-2134. [PMID: 33688741 DOI: 10.1021/acs.orglett.1c00280] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A simple method for rapid synthesis of 4-alkylindoles from 2-alkynylanilines was reported. The protocol involves an oxidative dearomatization and an aromatization triggered regioselective alkyl migration. A range of alkyl groups including linear, branched, or cycloalkyl groups can be introduced into the C4 position of indole.
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Affiliation(s)
- Lei Li
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, China
| | - Xiaohua Li
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, China
| | - Weiyi Wang
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, China
| | - Qiuqin He
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, China
| | - Renhua Fan
- Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai 200438, China
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9
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Mondal A, Chowdhury C. Palladium-Catalyzed Synthesis of 1-Vinyltetrahydro-β-carbolines and Aza-spiroindolenines: Access to the Syntheses of 1-Vinyl-β-carbolines and Eudistomins Y1 and Y2. J Org Chem 2021; 86:3810-3825. [PMID: 33591208 DOI: 10.1021/acs.joc.0c02651] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A general synthesis of 1-vinyltetrahydro-β-carbolines (THBCs) has been achieved via palladium(0)-catalyzed cyclocondensation between allenyltryptamines and aryl iodides. Aza-spiroindolenines could also be accessed from the N-unsubstituted indole substrates by simply tweaking the reaction conditions. DDQ-mediated oxidation of THBCs easily afforded β-carbolines, which could be synthetically transformed into 1-aroyl-β-carbolines of pharmacological interest. Formal total syntheses of eudistomins Y1 and Y2 have also been achieved.
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Affiliation(s)
- Amrita Mondal
- Organic & Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, India
| | - Chinmay Chowdhury
- Organic & Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4 Raja S. C. Mullick Road, Kolkata 700032, India
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