1
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Yadav B, Baire B. Ag(I)-Promoted, Diastereoselective Cyclo-isomerization of N-Alkynyl-7-azaindole-2-carbinols. Selective Synthesis of syn-1,2-Diarylpyrrolo[1,2- a]indol-3-ones and ( Z)-8-Benzylideneoxazolo[3',4'':1,5]pyrrolo[2,3- b]pyridines. Org Lett 2022; 24:5450-5455. [PMID: 35834489 DOI: 10.1021/acs.orglett.2c02179] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The design and development of an Ag(I)-promoted, highly diastereoselective cycloisomerization strategy for the synthesis of syn-1,2-diarylpyrrolo[1,2-a]indol-3-ones from N-alkynyl-indole-2-carbinols is reported. The H218O control experiment and identification of 18O-labeled product suggested the involvement of an external water. The 7-azaindole substrates showned a distinct reactivity to give the (Z)-8-benzylideneoxazolo[3',4':1,5]pyrrolo[2,3-b]pyridines. Key features of this strategy are its 100% atom economy, access to important heterocycles, diverse substrate scope, yields up to 95%, operationally simple procedure, and distinct reactivity of indole vs 7-azaindoles.
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Affiliation(s)
- Bhavna Yadav
- Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
| | - Beeraiah Baire
- Indian Institute of Technology Madras, Chennai 600036, Tamil Nadu, India
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2
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Nair AM, Halder I, Sharma R, Volla CMR. Water Mediated Rearrangement of Alkynyl Cyclohexadienones: Access to meta-Alkenylated Phenols. Org Lett 2021; 23:1840-1845. [DOI: 10.1021/acs.orglett.1c00245] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Akshay M. Nair
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Indranil Halder
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Ritu Sharma
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Chandra M. R. Volla
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
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3
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Intramolecular Alkene Hydroamination with Hybrid Catalysts Consisting of a Metal Salt and a Neutral Organic Base. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000671] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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4
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Liu X, Wang Y, Zhou J, Yu Y, Cao H. Triflic Acid-Catalyzed Cycloisomerization of 1,6-Enynes: Facile Access to Carbo- and Azaheterocycles. J Org Chem 2020; 85:2406-2414. [PMID: 31870155 DOI: 10.1021/acs.joc.9b03112] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A new and efficient strategy for enynes cyclization catalyzed by triflic acid has been described. Various valuable carbocycle-fused and heterocycle-fused ketones were easily accessed by the formation of new C-C and C-O bond under benign reaction conditions. This protocol also provides another opportunity to construct polycyclic single-nitrogen ketones via a cation-induced cascade cyclization of polyenynes. Furthermore, antiviral bioassays revealed that a few compounds exhibited good antiviral activity against tobacco mosaic virus at a concentration of 200 μg mL-1.
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Affiliation(s)
- Xiang Liu
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center , Guangdong Pharmaceutical University , Zhongshan 528458 , P. R. of China
| | - Yuhan Wang
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center , Guangdong Pharmaceutical University , Zhongshan 528458 , P. R. of China
| | - Jinlei Zhou
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center , Guangdong Pharmaceutical University , Zhongshan 528458 , P. R. of China
| | - Yue Yu
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center , Guangdong Pharmaceutical University , Zhongshan 528458 , P. R. of China
| | - Hua Cao
- School of Chemistry and Chemical Engineering and Guangdong Cosmetics Engineering & Technology Research Center , Guangdong Pharmaceutical University , Zhongshan 528458 , P. R. of China
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5
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Schreyer M, Milzarek TM, Wegmann M, Brunner A, Hintermann L. Discovery and Comparison of Homogeneous Catalysts in a Standardized HOT‐CAT Screen with Microwave‐Heating and qNMR Analysis: Exploring Catalytic Hydration of Alkynes. ChemCatChem 2019. [DOI: 10.1002/cctc.201900456] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Matthias Schreyer
- Technische Universität MünchenDepartment Chemie Lichtenbergstr. 4 Garching bei München 85748 Germany
- TUM Catalysis Research Center Ernst-Otto-Fischer-Str. 1 Garching bei München 85748 Germany
| | - Tobias M. Milzarek
- Technische Universität MünchenDepartment Chemie Lichtenbergstr. 4 Garching bei München 85748 Germany
| | - Marcus Wegmann
- Technische Universität MünchenDepartment Chemie Lichtenbergstr. 4 Garching bei München 85748 Germany
- TUM Catalysis Research Center Ernst-Otto-Fischer-Str. 1 Garching bei München 85748 Germany
| | - Andreas Brunner
- Technische Universität MünchenDepartment Chemie Lichtenbergstr. 4 Garching bei München 85748 Germany
| | - Lukas Hintermann
- Technische Universität MünchenDepartment Chemie Lichtenbergstr. 4 Garching bei München 85748 Germany
- TUM Catalysis Research Center Ernst-Otto-Fischer-Str. 1 Garching bei München 85748 Germany
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6
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Trost BM, Kalnmals CA. Sulfones as Synthetic Linchpins: Transition‐Metal‐Free sp
3
–sp
2
and sp
2
–sp
2
Cross‐Couplings Between Geminal Bis(sulfones) and Organolithium Compounds. Chemistry 2018; 24:9066-9074. [PMID: 29543985 DOI: 10.1002/chem.201800118] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Barry M. Trost
- Department of Chemistry Stanford University Stanford CA 94305 USA
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7
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Gandhi S, Baire B. Calcium(II) Catalyzed Cycloisomerization of cis
-6-Hydroxy/(Acyloxy)hex-2-en-4-ynals to 2-Acyl- and 2-(Acyloxyalkenyl)furans. ChemistrySelect 2018. [DOI: 10.1002/slct.201800618] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Soniya Gandhi
- Department of Chemistry; Indian Institute of Technology Madras, Chennai; Tamilnadu INDIA-600036
| | - Beeraiah Baire
- Department of Chemistry; Indian Institute of Technology Madras, Chennai; Tamilnadu INDIA-600036
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8
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Uno BE, Dicken RD, Redfern LR, Stern CM, Krzywicki GG, Scheidt KA. Calcium(ii)-catalyzed enantioselective conjugate additions of amines. Chem Sci 2018; 9:1634-1639. [PMID: 29675209 PMCID: PMC5887857 DOI: 10.1039/c7sc05205g] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Accepted: 12/15/2017] [Indexed: 02/04/2023] Open
Abstract
The direct enantioselective chiral calcium(ii)·phosphate complex (Ca[CPA]2)-catalyzed conjugate addition of unprotected alkyl amines to maleimides was developed.
The direct enantioselective chiral calcium(ii)·phosphate complex (Ca[CPA]2)-catalyzed conjugate addition of unprotected alkyl amines to maleimides was developed. This mild catalytic system represents a significant advance towards the general convergent asymmetric amination of α,β-unsaturated electrophiles, providing medicinally relevant chiral aminosuccinimide products in high yields and enantioselectivities. Furthermore, the catalyst can be reused directly from a previously chromatographed reaction and still maintain both high yield and selectivity.
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Affiliation(s)
- Brice E Uno
- Department of Chemistry , Center for Molecular Innovation and Drug Discovery , Northwestern University , 2145 Sheridan Rd , Evanston , IL 60208 , USA .
| | - Rachel D Dicken
- Department of Chemistry , Center for Molecular Innovation and Drug Discovery , Northwestern University , 2145 Sheridan Rd , Evanston , IL 60208 , USA .
| | - Louis R Redfern
- Department of Chemistry , Center for Molecular Innovation and Drug Discovery , Northwestern University , 2145 Sheridan Rd , Evanston , IL 60208 , USA .
| | - Charlotte M Stern
- Department of Chemistry , Center for Molecular Innovation and Drug Discovery , Northwestern University , 2145 Sheridan Rd , Evanston , IL 60208 , USA .
| | - Greg G Krzywicki
- Department of Chemistry , Center for Molecular Innovation and Drug Discovery , Northwestern University , 2145 Sheridan Rd , Evanston , IL 60208 , USA .
| | - Karl A Scheidt
- Department of Chemistry , Center for Molecular Innovation and Drug Discovery , Northwestern University , 2145 Sheridan Rd , Evanston , IL 60208 , USA .
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9
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Yang Y, Wang H, Ma H. Unprecedented Reaction Pathway of Sterically Crowded Calcium Complexes: Sequential C−N Bond Cleavage Reactions Induced by C−H Bond Activations. Chem Asian J 2016; 12:239-247. [DOI: 10.1002/asia.201601497] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2016] [Revised: 11/28/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Yang Yang
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry; School of Chemistry & Molecular Engineering; East China University of Science and Technology; P.O. Box 310, 130 Meilong Road 200237 Shanghai P.R. China
| | - Haobing Wang
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry; School of Chemistry & Molecular Engineering; East China University of Science and Technology; P.O. Box 310, 130 Meilong Road 200237 Shanghai P.R. China
| | - Haiyan Ma
- Shanghai Key Laboratory of Functional Materials Chemistry and Laboratory of Organometallic Chemistry; School of Chemistry & Molecular Engineering; East China University of Science and Technology; P.O. Box 310, 130 Meilong Road 200237 Shanghai P.R. China
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10
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Rauser M, Schroeder S, Niggemann M. Cooperative Catalysis: Calcium and Camphorsulfonic Acid Catalyzed Cycloisomerization of Diynols. Chemistry 2015; 21:15929-33. [PMID: 26403228 DOI: 10.1002/chem.201503293] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Indexed: 11/11/2022]
Abstract
The first transition metal-free cycloisomerization of easily accessible diynols is presented as a novel approach to bicyclic 2H-pyrans. As a one-step protocol, the reaction proceeds in a single reaction cascade by intertwining mechanistic fragments borrowed from transition metal-catalyzed Claisen rearrangment of vinyl ethers with our own work on allenyl/propargyl cation rearrangements and a 6π-oxo-electrocylization. It is enabled by a new cooperative catalytic system that combines a simple Ca(2+) catalyst with camphorsulfonic acid.
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Affiliation(s)
- Marian Rauser
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany)
| | - Sebastian Schroeder
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany)
| | - Meike Niggemann
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany).
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11
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Leboeuf D, Presset M, Michelet B, Bour C, Bezzenine-Lafollée S, Gandon V. Ca(II) -catalyzed alkenylation of alcohols with vinylboronic acids. Chemistry 2015; 21:11001-5. [PMID: 26133924 DOI: 10.1002/chem.201501677] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2015] [Indexed: 11/07/2022]
Abstract
Direct alkenylation of a variety of alcohols with vinylboronic acids has been accomplished using the air-stable calcium(II) complex Ca(NTf2 )2 under mild conditions with short reaction times. For reluctant transformations, an ammonium salt was used as an additive to circumvent the reactivity issue.
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Affiliation(s)
- David Leboeuf
- ICMMO (UMR CNRS 8182), Université Paris-Sud, Bâtiment 420, 91405 Orsay cedex (France)
| | - Marc Presset
- ICMMO (UMR CNRS 8182), Université Paris-Sud, Bâtiment 420, 91405 Orsay cedex (France)
| | - Bastien Michelet
- ICMMO (UMR CNRS 8182), Université Paris-Sud, Bâtiment 420, 91405 Orsay cedex (France)
| | - Christophe Bour
- ICMMO (UMR CNRS 8182), Université Paris-Sud, Bâtiment 420, 91405 Orsay cedex (France)
| | | | - Vincent Gandon
- ICMMO (UMR CNRS 8182), Université Paris-Sud, Bâtiment 420, 91405 Orsay cedex (France).
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12
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Stopka T, Niggemann M. Cyclopentanone as a Cation-Stabilizing Electron-Pair Donor in the Calcium-Catalyzed Intermolecular Carbohydroxylation of Alkynes. Org Lett 2015; 17:1437-40. [DOI: 10.1021/acs.orglett.5b00312] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Tobias Stopka
- Institute of Organic Chemistry, RWTH Aachen University, 52074 Aachen, Germany
| | - Meike Niggemann
- Institute of Organic Chemistry, RWTH Aachen University, 52074 Aachen, Germany
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13
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Presset M, Michelet B, Guillot R, Bour C, Bezzenine-Lafollée S, Gandon V. Gallium(III)- and calcium(II)-catalyzed Meyer–Schuster rearrangements followed by intramolecular aldol condensation or endo-Michael addition. Chem Commun (Camb) 2015; 51:5318-21. [DOI: 10.1039/c4cc09514f] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The first gallium- and calcium-catalyzed Meyer–Schuster rearrangements are described. The incipient conjugated ketones can undergo calcium-catalyzed aldol condensation (a) or endo-Michael addition (b) with β-keto esters or amides.
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Affiliation(s)
- M. Presset
- Université Paris-Sud
- ICMMO (UMR CNRS 8182)
- LabEx CHARM3AT
- 91405 Orsay cedex
- France
| | - B. Michelet
- Université Paris-Sud
- ICMMO (UMR CNRS 8182)
- LabEx CHARM3AT
- 91405 Orsay cedex
- France
| | - R. Guillot
- Université Paris-Sud
- ICMMO (UMR CNRS 8182)
- LabEx CHARM3AT
- 91405 Orsay cedex
- France
| | - C. Bour
- Université Paris-Sud
- ICMMO (UMR CNRS 8182)
- LabEx CHARM3AT
- 91405 Orsay cedex
- France
| | | | - V. Gandon
- Université Paris-Sud
- ICMMO (UMR CNRS 8182)
- LabEx CHARM3AT
- 91405 Orsay cedex
- France
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14
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Affiliation(s)
- David Lebœuf
- Université Paris-Sud, Institut de Chimie Moléculaire
et des Matériaux (UMR 8182), Equipe de Catalyse Moléculaire, 91405 Orsay, France
- CNRS, 91405 Orsay, France
| | - Emmanuelle Schulz
- Université Paris-Sud, Institut de Chimie Moléculaire
et des Matériaux (UMR 8182), Equipe de Catalyse Moléculaire, 91405 Orsay, France
- CNRS, 91405 Orsay, France
| | - Vincent Gandon
- Université Paris-Sud, Institut de Chimie Moléculaire
et des Matériaux (UMR 8182), Equipe de Catalyse Moléculaire, 91405 Orsay, France
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15
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Wu YK, West FG. Formal Homologous Aldol Reactions: Interrupting the Nazarov Cyclization via Carboalkoxylation of Alkynes. Org Lett 2014; 16:2534-7. [DOI: 10.1021/ol500914a] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Yen-Ku Wu
- Department
of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry
Center, Edmonton, AB T6G
2G2, Canada
| | - F. G. West
- Department
of Chemistry, University of Alberta, E3-43 Gunning-Lemieux Chemistry
Center, Edmonton, AB T6G
2G2, Canada
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