1
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Siera H, Kreuzahler M, Wölper C, Haberhauer G. Regio‐ and Stereoselective Synthesis of Ynenamides through Gold(I)‐Catalyzed Hydroalkynylation of Ynamides. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200591] [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)
- Hannah Siera
- University of Duisburg-Essen: Universitat Duisburg-Essen Institut für Organische Chemie GERMANY
| | - Mathis Kreuzahler
- University of Duisburg-Essen: Universitat Duisburg-Essen Institut für Organische Chemie GERMANY
| | - Christoph Wölper
- University of Duisburg-Essen: Universitat Duisburg-Essen Institut für Anorganische Chemie GERMANY
| | - Gebhard Haberhauer
- Universität Duisburg-Essen Institut für Organische Chemie Universitätsstraße 7 45117 Essen GERMANY
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2
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Reactivity of ynamides with AlCl3 and ICl: Ready access to (E)-α-chloroenamides and (E/Z)-α-chloro-β-iodo-enamides. J CHEM SCI 2021. [DOI: 10.1007/s12039-020-01880-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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3
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Pradhan TR, Paudel M, Harper JL, Cheong PHY, Park JK. Characterization and Utilization of the Elusive α,β-Unsaturated N-Tosyliminium: the Synthesis of Highly Functionalizable Skipped Halo Enynes. Org Lett 2021; 23:1427-1433. [PMID: 33538600 DOI: 10.1021/acs.orglett.1c00103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A formal haloalkynylation of allenamides has been described for the synthesis of highly stereo- and regioselective skipped halo enynes. Exclusive γ-regioselectivity is achieved through the intermediacy of a conjugated N-tosyliminium intermediate-direct evidence for the formation of which was validated by NMR and HRMS. Quantum mechanical computations reveal that the reactive intermediate geometry is key to controlling the 1,2- or 1,4-regioselectivity of alkyne interception. Divergent access to elusive unsaturated systems has also been reported.
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Affiliation(s)
- Tapas R Pradhan
- Department of Chemistry and Institution for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Mukti Paudel
- Department of Chemistry and Institution for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
| | - Jordan L Harper
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States
| | - Paul Ha-Yeon Cheong
- Department of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States
| | - Jin Kyoon Park
- Department of Chemistry and Institution for Functional Materials, Pusan National University, Busan 46241, Republic of Korea
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4
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Yang XH, Huang J, Wang F, Liu Z, Li Y, Tao CA, Wang J. Copper-catalyzed alkynylation/annulation cascades of N-allyl ynamides: regioselective access to medium-sized N-heterocycles. Org Chem Front 2021. [DOI: 10.1039/d0qo00837k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A synthetic strategy based on sequential application of aza-Claisen rearrangement, C–H functionalization, C–N coupling and cyclization as key steps has been developed for the synthesis of 6-, 7-, 8-, and 9-membered rings N-heterocycles.
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Affiliation(s)
- Xu-Heng Yang
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Jian Huang
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Fang Wang
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Zhuoliang Liu
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Yujiao Li
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Cheng-an Tao
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
| | - Jianfang Wang
- College of Liberal Arts and Science
- National University of Defense Technology
- Changsha 410073
- China
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5
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Zhu L, Guo H, Feng X, Yamamoto Y, Bao M. Copper-Catalyzed One-Pot Synthesis of 1,3-Enynes from 2-Chloro- N-(quinolin-8-yl)acetamides and Terminal Alkynes. J Org Chem 2020; 85:8740-8748. [PMID: 32486641 DOI: 10.1021/acs.joc.0c01102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A method for the chemo-, regio-, and stereoselective one-pot synthesis of 1,3-enynes is described. The reaction of 2-chloro-N-(quinolin-8-yl)acetamides with terminal alkynes proceeds smoothly in the presence of a copper catalyst at room temperature to produce (E)-1,3-enynes in satisfactory to excellent yields. The mechanism study reveals that the cross-dimerization of internal alkynes generated in situ with terminal alkynes proceeds via allene intermediates. The directing group 8-aminoquinoline plays a key role in the current selective synthesis of (E)-1,3-enynes.
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Affiliation(s)
- Lifan Zhu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China
| | - Hongyu Guo
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China
| | - Xiujuan Feng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China
| | - Yoshinori Yamamoto
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China.,Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.,Research Organization of Science and Technology, Ritsumeikan University, Kusatsu, Shiga 525-8577, Japan
| | - Ming Bao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116023, China
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6
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Kang K, Sakamoto K, Nishimoto Y, Yasuda M. Synthesis of (Z)-β-(Carbonylamino)alkenylindium through Regioselective anti-Carboindation of Ynamides and Its Transformation to Multisubstituted Enamides. Chemistry 2020; 26:4930-4934. [PMID: 31833583 DOI: 10.1002/chem.201905175] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2019] [Revised: 12/12/2019] [Indexed: 11/06/2022]
Abstract
The regioselective anti-carboindation of ynamides by using InBr3 and silylated nucleophiles was developed to synthesize (Z)-β-(carbonylamino)alkenylindiums. The X-ray crystallographic analysis of an alkenylindium suggested that the reaction proceeded in an anti-addition fashion. In contrast to reported syn-carbometalations of ynamides by using organometallics, a cooperation of InBr3 and silylated nucleophiles to ynamides achieved an anti-addition, which was supported by DFT calculations. The scope of substrates included various ynamides and silylated nucleophiles, such as silyl ketene acetals and silyl ketene imines. The transformation of synthesized alkenylindiums by iodination, radical coupling, and Pd-catalyzed cross-coupling successfully afforded trisubstituted enamines with high regio- and stereoselectivities.
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Affiliation(s)
- Kyoungmin Kang
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
| | - Kosuke Sakamoto
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
| | - Yoshihiro Nishimoto
- Frontier Research Base for Global Young Researchers Center, for Open Innovation Research and Education (COiRE), Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
| | - Makoto Yasuda
- Department of Applied Chemistry, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, Japan
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7
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Li H, Yang Y, Han Z, Liu C, Zhang D. Computational mechanistic study on Pd-catalyzed stereoselective synthesis of Z-1,3- and E-1,4-enynes from ligand-controlled regiodivergent hydroalkynylations of allenamides. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.110765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Singam MKR, Nagireddy A, Rajesh M, Ganesh V, Reddy MS. Ni-Catalyzed electrophile driven regioselective arylative cyclization of ortho-functional diaryl acetylenes for the synthesis of pyridine and indene derivatives. Org Chem Front 2020. [DOI: 10.1039/c9qo01266d] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A regioselective arylative cyclization of ortho functional diaryl acetylenes for the synthesis of selectively substituted diaryl pyridine and indene derivatives is accomplished through an electrophile driven alkyne polarization.
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Affiliation(s)
- Maneesh Kumar Reddy Singam
- Department of OSPC
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research
| | - Attunuri Nagireddy
- Department of OSPC
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research
| | - Manda Rajesh
- Department of OSPC
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research
| | - Veeramalla Ganesh
- Department of OSPC
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research
| | - Maddi Sridhar Reddy
- Department of OSPC
- CSIR-Indian Institute of Chemical Technology
- Hyderabad 500007
- India
- Academy of Scientific and Innovative Research
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9
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Massaro L, Yang J, Krajangsri S, Silvi E, Singh T, Andersson PG. Stereodivergent Synthesis of Trisubstituted Enamides: Direct Access to Both Pure Geometrical Isomers. J Org Chem 2019; 84:13540-13548. [DOI: 10.1021/acs.joc.9b01803] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Luca Massaro
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory, 10691 Stockholm, Sweden
| | - Jianping Yang
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory, 10691 Stockholm, Sweden
| | - Suppachai Krajangsri
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory, 10691 Stockholm, Sweden
| | - Emanuele Silvi
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory, 10691 Stockholm, Sweden
| | - Thishana Singh
- School of Chemistry and Physics, University of Kwazulu—Natal, Private Bag X54001, Durban 4000, South Africa
| | - Pher G. Andersson
- Department of Organic Chemistry, Stockholm University, Arrhenius Laboratory, 10691 Stockholm, Sweden
- School of Chemistry and Physics, University of Kwazulu—Natal, Private Bag X54001, Durban 4000, South Africa
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10
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Alam K, Kim JG, Kang DY, Park JK. Regiodivergent Trifluoromethanesulfonic Acid‐Promoted Cycloisomerizations of Ynenamines to Fused Indoles. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801506] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Khyarul Alam
- The Department of Chemistry and Chemistry Institute of Functional MaterialsPusan National University Busan 46241 Korea
| | - Jin Gyeong Kim
- The Department of Chemistry and Chemistry Institute of Functional MaterialsPusan National University Busan 46241 Korea
| | - Dong Yun Kang
- The Department of Chemistry and Chemistry Institute of Functional MaterialsPusan National University Busan 46241 Korea
| | - Jin Kyoon Park
- The Department of Chemistry and Chemistry Institute of Functional MaterialsPusan National University Busan 46241 Korea
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11
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Reinus B, Kerwin SM. Preparation and Utility of N-Alkynyl Azoles in Synthesis. Molecules 2019; 24:E422. [PMID: 30682796 PMCID: PMC6384649 DOI: 10.3390/molecules24030422] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 01/16/2019] [Accepted: 01/22/2019] [Indexed: 12/05/2022] Open
Abstract
Heteroatom-substituted alkynes have attracted a significant amount of interest in the synthetic community due to the polarized nature of these alkynes and their utility in a wide range of reactions. One specific class of heteroatom-substituted alkynes combines this utility with the presence of an azole moiety. These N-alkynyl azoles have been known for nearly 50 years, but recently there has been a tremendous increase in the number of reports detailing the synthesis and utility of this class of compound. While much of the chemistry of N-alkynyl azoles mirrors that of the more extensively studied N-alkynyl amides (ynamides), there are notable exceptions. In addition, as azoles are extremely common in natural products and pharmaceuticals, these N-alkynyl azoles have high potential for accessing biologically important compounds. In this review, the literature reports of N-alkynyl azole synthesis, reactions, and uses have been assembled. Collectively, these reports demonstrate the growth in this area and the promise of exploiting N-alkynyl azoles in synthesis.
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Affiliation(s)
- Brandon Reinus
- Department of Chemistry, University of Texas at Austin, Austin, TX 78712, USA.
| | - Sean M Kerwin
- Department of Chemistry & Biochemistry, Texas State University, San Marcos, TX 78666, USA.
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12
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Salehi P, Shiri M. Palladium‐Catalyzed Regioselective Synthesis of 3‐(Hetero)Arylpropynamides from
gem
‐Dibromoalkenes and Isocyanides. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201800963] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Parvin Salehi
- Department of ChemistryAlzahra University, Vanak Tehran 1993893973 Iran
| | - Morteza Shiri
- Department of ChemistryAlzahra University, Vanak Tehran 1993893973 Iran
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13
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Prochnow T, Maroneze A, Back DF, Jardim NS, Nogueira CW, Zeni G. Synthesis and anticholinesterase activity of 2-substituted-N-alkynylindoles. Org Biomol Chem 2018; 16:7926-7934. [PMID: 30311614 DOI: 10.1039/c8ob02165a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this paper, we report a protocol for the preparation of 2-substituted-N-alkynylindoles via metalation of N-alkynylindoles followed by the capture of a 2-indolyl lithium intermediate with different electrophiles. The reactivity of the indoles prepared was also demonstrated through the reaction with CBr4/Ph3P for the preparation of 2-gem-dibromovinyl N-alkynylindoles and the hydrotelluration reaction of N-alkynylindoles, which led to vinylic tellurides. Some compounds prepared showed AChE inhibitory potential in the low micromolar range similar to that obtained with donepezil, a commercially available cholinesterase inhibitor.
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Affiliation(s)
- Thaís Prochnow
- Laboratório de Síntese, Reatividade, Avaliação Farmacológica e Toxicológica de Organocalcogênios, CCNE, UFSM, Santa Maria, Rio Grande do Sul 97105-900, Brasil.
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14
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Pradhan TR, Kim HW, Park JK. Harnessing the Polarizability of Conjugated Alkynes toward [2 + 2] Cycloaddition, Alkenylation, and Ring Expansion of Indoles. Org Lett 2018; 20:5286-5290. [PMID: 30141335 DOI: 10.1021/acs.orglett.8b02230] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Reported is the utilization of electronically biased conjugated alkynes in the development of highly diastereo- and regioselective dearomative [2 + 2] cycloadditions, alkenylations, and ring expansions of electron-rich indoles. Regioselective protonations of cross- and linear-conjugated alkynes were found to be crucial for accessing various cyclobutene-fused indoline and alkenylated indole derivatives. Furthermore, the facile ring expansion of [2 + 2] keto adducts, which were successfully synthesized from ynones, provided 1 H-benzo[ b]azepine scaffolds.
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Affiliation(s)
- Tapas R Pradhan
- The Department of Chemistry and Chemistry Institute of Functional Materials , Pusan National University , Busan 46241 , Korea
| | - Hong Won Kim
- The Department of Chemistry and Chemistry Institute of Functional Materials , Pusan National University , Busan 46241 , Korea
| | - Jin Kyoon Park
- The Department of Chemistry and Chemistry Institute of Functional Materials , Pusan National University , Busan 46241 , Korea
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15
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Pradhan TR, Kim HW, Park JK. Regiodivergent Synthesis of 1,3- and 1,4-Enynes through Kinetically Favored Hydropalladation and Ligand-Enforced Carbopalladation. Angew Chem Int Ed Engl 2018; 57:9930-9935. [DOI: 10.1002/anie.201805408] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Indexed: 12/21/2022]
Affiliation(s)
- Tapas R. Pradhan
- Department of Chemistry and Chemistry Institute of Functional Materials; Pusan National University; Busan 46241 Korea
| | - Hong Won Kim
- Department of Chemistry and Chemistry Institute of Functional Materials; Pusan National University; Busan 46241 Korea
| | - Jin Kyoon Park
- Department of Chemistry and Chemistry Institute of Functional Materials; Pusan National University; Busan 46241 Korea
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16
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Pradhan TR, Kim HW, Park JK. Regiodivergent Synthesis of 1,3- and 1,4-Enynes through Kinetically Favored Hydropalladation and Ligand-Enforced Carbopalladation. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201805408] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Tapas R. Pradhan
- Department of Chemistry and Chemistry Institute of Functional Materials; Pusan National University; Busan 46241 Korea
| | - Hong Won Kim
- Department of Chemistry and Chemistry Institute of Functional Materials; Pusan National University; Busan 46241 Korea
| | - Jin Kyoon Park
- Department of Chemistry and Chemistry Institute of Functional Materials; Pusan National University; Busan 46241 Korea
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17
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Abstract
This review covers diastereo- and enantiodivergent catalyzed reactions in acyclic and cyclic systems using metal complexes or organocatalysts. Among them, nucleophilic addition to carbon-carbon and carbon-nitrogen double bonds, α-functionalization of carbonyl compounds, allylic substitutions, and ring opening of oxiranes and aziridines are considered. The diastereodivergent synthesis of alkenes from alkynes is also included. Finally, stereodivergent intramolecular and intermolecular cycloadditions and other cyclizations are also reported.
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Affiliation(s)
- Irina P Beletskaya
- Chemistry Department , M. V. Lomonosov Moscow State University , Leninskie Gory 1 , 119992 Moscow , Russia
| | - Carmen Nájera
- Departamento de Química Orgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Alicante , Apdo. 99 , E-03080 Alicante , Spain
| | - Miguel Yus
- Departamento de Química Orgánica and Centro de Innovación en Química Avanzada (ORFEO-CINQA) , Universidad de Alicante , Apdo. 99 , E-03080 Alicante , Spain
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18
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Yang T, Fan X, Zhao X, Yu W. Iron-Catalyzed Acyl Migration of Tertiary α-Azidyl Ketones: Synthetic Approach toward Enamides and Isoquinolones. Org Lett 2018; 20:1875-1879. [DOI: 10.1021/acs.orglett.8b00409] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tonghao Yang
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xing Fan
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Xiaopeng Zhao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
| | - Wei Yu
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P. R. China
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19
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Kumar R, Thorat SH, Reddy MS. Cu-Catalyzed iminative hydroolefination of unactivated alkynes en route to 4-imino-tetrahydropyridines and 4-aminopyridines. Chem Commun (Camb) 2018; 52:13475-13478. [PMID: 27790654 DOI: 10.1039/c6cc08081b] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A general method for synthesizing 4-imino tetrahydropyridine derivatives is achieved, from readily available β-enaminones and sulfonyl azides, which comprises a sequential copper catalyzed ketenimine formation and its hitherto inaccessible intramolecular hydrovinylation. The products are shown as ready precursors for highly valuable 4-sulfonamidopyridine derivatives via DDQ mediated oxidation.
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Affiliation(s)
- Ravi Kumar
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram extension, Sitapur Road, Lucknow 226031, India. and Academy of Scientific and Innovative Research, New Delhi 110001, India
| | - Shridhar H Thorat
- Centre for Materials Characterization, CSIR-NCL, Dr Homi Bhabha Road, Pune-411008, India
| | - Maddi Sridhar Reddy
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram extension, Sitapur Road, Lucknow 226031, India. and Academy of Scientific and Innovative Research, New Delhi 110001, India
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20
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Ranjith Kumar G, Kumar R, Rajesh M, Sridhar Reddy M. A nickel-catalyzed anti-carbometallative cyclization of alkyne–azides with organoboronic acids: synthesis of 2,3-diarylquinolines. Chem Commun (Camb) 2018; 54:759-762. [DOI: 10.1039/c7cc08408k] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An anti-carbonickelative cyclization via reversible alkenylnickel E/Z isomerization of 2-azido phenyl propargyl alcohols with aryl boronic acids is achieved using Ni(acac)2 as the catalyst to access 2,3-diaryl quinolines.
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Affiliation(s)
- Gadi Ranjith Kumar
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
| | - Ravi Kumar
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
| | - Manda Rajesh
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Maddi Sridhar Reddy
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
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21
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Baldassari LL, de la Torre A, Li J, Lüdtke DS, Maulide N. Ynamide Preactivation Allows a Regio- and Stereoselective Synthesis of α,β-Disubstituted Enamides. Angew Chem Int Ed Engl 2017; 56:15723-15727. [PMID: 29032598 DOI: 10.1002/anie.201709128] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Indexed: 12/13/2022]
Abstract
A novel ynamide preactivation strategy enables the use of otherwise incompatible reagents and allows preparation of α,β-disubstituted enamides with high regio- and stereoselectivity. Mechanistic analysis reveals the intermediacy of a triflate-bound intermediate as a solution-stable, effective keteniminium reservoir, whilst still allowing subsequent addition of organometallic reagents.
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Affiliation(s)
- Lucas L Baldassari
- Institute of Chemistry, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970, Porto Alegre, RS, Brazil
| | - Aurélien de la Torre
- Institute of Organic Chemistry, University of Vienna, Währinger Strassee 38, 1090, Vienna, Austria
| | - Jing Li
- Institute of Organic Chemistry, University of Vienna, Währinger Strassee 38, 1090, Vienna, Austria
| | - Diogo S Lüdtke
- Institute of Chemistry, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970, Porto Alegre, RS, Brazil
| | - Nuno Maulide
- Institute of Organic Chemistry, University of Vienna, Währinger Strassee 38, 1090, Vienna, Austria
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22
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Baldassari LL, de la Torre A, Li J, Lüdtke DS, Maulide N. Regio- und stereoselektive Synthese α,β-disubstituierter Enamide durch Voraktivierung von Inamiden. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709128] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Lucas L. Baldassari
- Institute of Chemistry; Universidade Federal do Rio Grande do Sul; Av. Bento Gonçalves 9500 91501-970 Porto Alegre RS Brasilien
| | - Aurélien de la Torre
- Institut für Organische Chemie; Universität Wien; Währinger Straße 38 1090 Wien Österreich
| | - Jing Li
- Institut für Organische Chemie; Universität Wien; Währinger Straße 38 1090 Wien Österreich
| | - Diogo S. Lüdtke
- Institute of Chemistry; Universidade Federal do Rio Grande do Sul; Av. Bento Gonçalves 9500 91501-970 Porto Alegre RS Brasilien
| | - Nuno Maulide
- Institut für Organische Chemie; Universität Wien; Währinger Straße 38 1090 Wien Österreich
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23
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Kumar R, Dwivedi V, Sridhar Reddy M. Metal-Free Iodosulfonylation of Internal Alkynes: Stereodefined Access to Tetrasubstituted Olefins. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700576] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ravi Kumar
- Medicinal & Process Chemistry Division; CSIR - Central Drug Research Institute; B.S. 10/1, Sector 10, Jankipuram Extension; Sitapur Road Lucknow 226031 India
- Academy of Scientific and Innovative Research; New Delhi 110001 India
| | - Vikas Dwivedi
- Medicinal & Process Chemistry Division; CSIR - Central Drug Research Institute; B.S. 10/1, Sector 10, Jankipuram Extension; Sitapur Road Lucknow 226031 India
| | - Maddi Sridhar Reddy
- Academy of Scientific and Innovative Research; New Delhi 110001 India
- MCB Division; CSIR - Indian Institute of Chemical Technology; Hyderabad India
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24
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Dwivedi V, Kumar R, Sharma K, Sridhar B, Reddy MS. Copper-Promoted Regioselective Intermolecular Diamination of Ynamides: Synthesis of Imidazo[1,2- a]pyridines. ACS OMEGA 2017; 2:2770-2777. [PMID: 31457615 PMCID: PMC6641143 DOI: 10.1021/acsomega.7b00426] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 06/05/2017] [Indexed: 06/10/2023]
Abstract
A facile access to 3-heterosubstituted (3-oxazolidinonyl/indolyl/phenoxy) imidazo[1,2-a]pyridines from readily available 2-aminopyridines and electron-rich (internally activated) alkynes like ynamides/ynamines/ynol ethers is achieved via Cu(OTf)2-mediated intermolecular diamination under aerobic conditions. The reaction is highly regioselective, owing to internal electron bias, and thus led to a single regioisomer with heterosubstitution at C3.
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Affiliation(s)
- Vikas Dwivedi
- Medicinal
& Process Chemistry Division, CSIR-Central
Drug Research Institute, Sector 10, Jankipuram Extn, Sitapur Road, Lucknow 226031, India
| | - Ravi Kumar
- Medicinal
& Process Chemistry Division, CSIR-Central
Drug Research Institute, Sector 10, Jankipuram Extn, Sitapur Road, Lucknow 226031, India
- Academy
of Scientific and Innovative Research, New Delhi 110001, India
| | - Kavita Sharma
- National
Institute of Pharmaceutical Education and Research, Raebareli 229010, India
| | - Balasubramanian Sridhar
- X-Ray Crystallography Division and MCB Division, CSIR-IICT, Tarnaka, Hyderabad 500007, India
| | - Maddi Sridhar Reddy
- Medicinal
& Process Chemistry Division, CSIR-Central
Drug Research Institute, Sector 10, Jankipuram Extn, Sitapur Road, Lucknow 226031, India
- X-Ray Crystallography Division and MCB Division, CSIR-IICT, Tarnaka, Hyderabad 500007, India
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25
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26
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Siva Reddy A, Leela Siva Kumari A, Swamy KK. Palladium-catalyzed regioselective synthesis of benzosultams from functionalized ynamides and benzotriazoles/tetrazoles. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.03.070] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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27
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Xu Y, Liu XY, Wang ZQ, Tang LF. A convenient synthesis of N -vinyl enamides via the lithiation and ring-opening reaction of 2-phenyl-2-oxazolines. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.03.080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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28
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Hari Babu M, Ranjith Kumar G, Kant R, Sridhar Reddy M. Ni-Catalyzed regio- and stereoselective addition of arylboronic acids to terminal alkynes with a directing group tether. Chem Commun (Camb) 2017; 53:3894-3897. [DOI: 10.1039/c6cc10256e] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Addition of arylboronic acids to directing group tethered acetylenes in a regio and stereoselective manner using an inexpensive catalytic system is achieved for the first time to access highly sought after allyl/homoallyl alcohol/amine units.
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Affiliation(s)
- Madala Hari Babu
- MPC Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Gadi Ranjith Kumar
- MPC Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
| | - Ruchir Kant
- MSB Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Maddi Sridhar Reddy
- MPC Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
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29
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Dwivedi V, Rajesh M, Kumar R, Kant R, Sridhar Reddy M. A stereoselective thiocyanate conjugate addition to electron deficient alkynes and concomitant cyclization to N,S-heterocycles. Chem Commun (Camb) 2017; 53:11060-11063. [DOI: 10.1039/c7cc06081e] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A regio- and stereoselective thiocyanate addition to ynones and the concomitant cyclizations of resultant vinyl thiocyanate to access thio-aza heterocycles are achieved using KSCN in AcOH without the need of any metal catalyst.
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Affiliation(s)
- Vikas Dwivedi
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Manda Rajesh
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Ravi Kumar
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
| | - Ruchir Kant
- MSB Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Maddi Sridhar Reddy
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
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30
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Ligny R, Gauthier ES, Yáñez M, Roisnel T, Guillemin JC, Trolez Y. One-step synthesis of conjugated enynenitriles from bromocyanoacetylene. Org Biomol Chem 2017; 15:6050-6056. [DOI: 10.1039/c6ob02590k] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Bromocyanoacetylene is able to provide conjugated enynenitriles stereoselectively in one step from alkynes, secondary amines and co-catalysts.
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Affiliation(s)
- Romain Ligny
- Ecole Nationale Supérieure de Chimie de Rennes
- UMR 6226
- CNRS
- 35708 Rennes Cedex 7
- France
| | - Etienne S. Gauthier
- Ecole Nationale Supérieure de Chimie de Rennes
- UMR 6226
- CNRS
- 35708 Rennes Cedex 7
- France
| | | | - Thierry Roisnel
- Centre de Diffractométrie X
- Institut des Sciences Chimiques de Rennes
- CNRS (UMR 6226)
- Université de Rennes 1
- 35042 Rennes Cedex
| | - Jean-Claude Guillemin
- Ecole Nationale Supérieure de Chimie de Rennes
- UMR 6226
- CNRS
- 35708 Rennes Cedex 7
- France
| | - Yann Trolez
- Ecole Nationale Supérieure de Chimie de Rennes
- UMR 6226
- CNRS
- 35708 Rennes Cedex 7
- France
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31
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Rajesh M, Puri S, Kant R, Sridhar Reddy M. Synthesis of Substituted Furan/Pyrrole-3-carboxamides through a Tandem Nucleopalladation and Isocyanate Insertion. Org Lett 2016; 18:4332-5. [PMID: 27532221 DOI: 10.1021/acs.orglett.6b02077] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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32
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Puri S, Hari Babu M, Sridhar Reddy M. BF3·OEt2-mediated syn-selective Meyer-Schuster rearrangement of phenoxy propargyl alcohols for Z-β-aryl-α,β-unsaturated esters. Org Biomol Chem 2016; 14:7001-9. [PMID: 27355915 DOI: 10.1039/c6ob01090c] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Synthesis of Z-β-aryl-α,β-unsaturated esters from readily available 1-aryl-3-phenoxy propargyl alcohols is achieved via a BF3-mediated syn-selective Meyer-Schuster rearrangement under ambient conditions. The reaction mechanism is postulated to involve an electrophilic borylation of an allene intermediate as the key step to kinetically control the stereoselectivity.
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Affiliation(s)
- Surendra Puri
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, BS-10/1, Sector 10, Jankipuram extension, Sitapur Road, Lucknow 226031, India.
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33
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Kotipalli T, Kavala V, Konala A, Janreddy D, Kuo CW, Yao CF. Reagent/Substituent Switching Approach for the Synthesis of Substituted 1,3,4-Oxadiazole/1,3,4-Oxadiazoline and 1,2,4-Triazole Derivatives from N-Substituted Hydrazides. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600274] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Trimurtulu Kotipalli
- Department of Chemistry; National Taiwan Normal University; 88, Sec. 4, Tingchow Road Taipei Taiwan 116, R.O.C
| | - Veerababurao Kavala
- Department of Chemistry; National Taiwan Normal University; 88, Sec. 4, Tingchow Road Taipei Taiwan 116, R.O.C
| | - Ashok Konala
- Department of Chemistry; National Taiwan Normal University; 88, Sec. 4, Tingchow Road Taipei Taiwan 116, R.O.C
| | - Donala Janreddy
- Department of Chemistry; National Taiwan Normal University; 88, Sec. 4, Tingchow Road Taipei Taiwan 116, R.O.C
| | - Chu-Wei Kuo
- Department of Chemistry; National Taiwan Normal University; 88, Sec. 4, Tingchow Road Taipei Taiwan 116, R.O.C
| | - Ching-Fa Yao
- Department of Chemistry; National Taiwan Normal University; 88, Sec. 4, Tingchow Road Taipei Taiwan 116, R.O.C
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34
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Siva Reddy A, Siva Kumari AL, Saha S, Kumara Swamy KC. Palladium-Catalyzed Tandem-Cyclization of Functionalized Ynamides: An Approach to Benzosultams. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500854] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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35
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Huang H, Tang L, Liu Q, Xi Y, He G, Zhu H. Formation of α-chalcogenyl acrylamides through unprecedented chalcogen-mediated metal-free oxyfunctionalization of ynamides with DMSO as an oxidant. Chem Commun (Camb) 2016; 52:5605-8. [DOI: 10.1039/c5cc10517j] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A novel chalcogen-mediated metal-free oxyfunctionalization mode of ynamides for the synthesis of α-chalcogenyl acrylamides has been developed.
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Affiliation(s)
- Hai Huang
- Department of Applied Chemistry
- College of Sciences
- Nanjing Tech University
- Nanjing 211816
- People's Republic of China
| | - Luning Tang
- Department of Applied Chemistry
- College of Sciences
- Nanjing Tech University
- Nanjing 211816
- People's Republic of China
| | - Qi Liu
- Department of Applied Chemistry
- College of Sciences
- Nanjing Tech University
- Nanjing 211816
- People's Republic of China
| | - Yang Xi
- Department of Applied Chemistry
- College of Sciences
- Nanjing Tech University
- Nanjing 211816
- People's Republic of China
| | - Guangke He
- Department of Applied Chemistry
- College of Sciences
- Nanjing Tech University
- Nanjing 211816
- People's Republic of China
| | - Hongjun Zhu
- Department of Applied Chemistry
- College of Sciences
- Nanjing Tech University
- Nanjing 211816
- People's Republic of China
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36
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Ranjith Kumar G, Kiran Kumar Y, Kant R, Sridhar Reddy M. Synthesis of benzofuranyl and indolyl methyl azides by tandem silver-catalyzed cyclization and azidation. Org Biomol Chem 2016; 14:4077-88. [PMID: 27064507 DOI: 10.1039/c6ob00191b] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A tandem Ag-catalyzed 5-exo-dig cyclization and catalyst free γ-azidation for benzofuranyl/indolyl methyl azides is presented. The adducts are further transformed to useful triazole-, tetrazole-, amide-, amine-, and pyrido-derivatives.
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Affiliation(s)
- Gadi Ranjith Kumar
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
| | - Yalla Kiran Kumar
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Ruchir Kant
- Molecular & Structural Biology Division
- CSIR-CDRI
- Lucknow 226031
- India
| | - Maddi Sridhar Reddy
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
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37
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Kumar GR, Kumar YK, Reddy MS. A direct access to isoxazoles from ynones using trimethylsilyl azide as amino surrogate under metal/catalyst free conditions. Chem Commun (Camb) 2016; 52:6589-92. [DOI: 10.1039/c6cc02047j] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A general access to isoxazoles with outstanding functional group compatibility from the readily available ynones using trimethylsilyl azide as an amino surrogate under exceptionally simple conditions is described.
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Affiliation(s)
- Gadi Ranjith Kumar
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
| | - Yalla Kiran Kumar
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
| | - Maddi Sridhar Reddy
- Medicinal & Process Chemistry Division
- CSIR-Central Drug Research Institute
- Lucknow 226031
- India
- Academy of Scientific and Innovative Research
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38
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Prabagar B, Nayak S, Mallick RK, Prasad R, Sahoo AK. Triphenylphosphine promoted regio and stereoselective α-halogenation of ynamides. Org Chem Front 2016. [DOI: 10.1039/c5qo00345h] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Metal free α-halogenation of ynamides at room temperature.
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Affiliation(s)
- B. Prabagar
- School of Chemistry
- University of Hyderabad
- Hyderabad-500046
- India
| | - Sanatan Nayak
- School of Chemistry
- University of Hyderabad
- Hyderabad-500046
- India
| | | | - Rangu Prasad
- School of Chemistry
- University of Hyderabad
- Hyderabad-500046
- India
| | - Akhila K. Sahoo
- School of Chemistry
- University of Hyderabad
- Hyderabad-500046
- India
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