1
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Bora SK, Shit S, Sahu AK, Saikia AK. Diastereoselective Synthesis of 2,6-Disubstituted Tetrahydropyranones via Prins Cyclization of 3-Bromobut-3-en-1-ols and Aldehydes. J Org Chem 2023. [PMID: 36811615 DOI: 10.1021/acs.joc.2c02715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Tetrahydropyranones are synthesized from 3-bromobut-3-en-1-ols and aldehydes in good yields with excellent diastereoselectivity at -35 °C. The reaction involves an initial formation of a most stable six-membered chairlike tetrahydropyranyl carbocation followed by nucleophilic attack of the hydroxyl group and subsequent elimination of HBr to give tetrahydropyranone. The carbonyl moiety of the tetrahydropyranone is converted to enol ether and esters using Wittig reaction. It is also transformed into 4-hydroxy-2,6-disubstituted tetrahydropyran with 2,4- and 4,6-cis configuration by lithium aluminum hydride in up to 96% diastereoselectivity. Furthermore, the methodology is extended toward the synthesis of novel anticancer aminoguanidine compounds.
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Affiliation(s)
- Surjya Kumar Bora
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Sudip Shit
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Archana Kumari Sahu
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
| | - Anil K Saikia
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India
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2
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Biswas A, Kundu S, Maji MS, Pal D, Pal A. Organocatalyzed Oxa-Diels–Alder Reactions: Recent Progress. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1514-1049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractThe oxa-Diels–Alder reaction is a straightforward, atom-economical process for the construction of six-membered oxacycles, which are privileged structures due to their very common occurrence in several pharmaceuticals and natural products. As with many other asymmetric transformations, organocatalysis provides an elegant pathway to their synthesis via [4+2] annulation under mild reaction conditions. The oxa-Diels–Alder reaction utilizes either an α,β-unsaturated carbonyl as an oxa-diene with a suitable dienophile or a simple carbonyl as a dienophile with other dienes. A range of organocatalysts has been explored in the past decade to execute this strategy. The catalysts induce stereoselectivities via two basic reactivities: (1) The formation of chiral intermediates, or (2) selectively activating suitable reactants via a transition state. The present short review compiles organocatalyzed asymmetric oxa-Diels–Alder reactions published over the last ten years, along with detailed discussions on mechanistic approaches.1 Introduction2 Catalysis through Covalent Activation2.1 N-Heterocyclic Carbenes2.2 Amines2.3 Isothiourea Catalysis2.4 Phosphines3 Catalysis through Non-Covalent Activation3.1 Bifunctional Amines3.2 Brønsted Acids3.3 Guanidines4 Multicatalysis through Both Covalent and Non-Covalent Activation5 Conclusion
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Affiliation(s)
- Anup Biswas
- Department of Chemistry, Hooghly Women’s College
| | - Samrat Kundu
- Department of Chemistry, Indian Institute of Technology Kharagpur
| | - Modhu Sudan Maji
- Department of Chemistry, Indian Institute of Technology Kharagpur
| | - Dhananjoy Pal
- Department of Chemistry, Indian Institute of Technology Kharagpur
| | - Amit Pal
- Department of Chemistry, Indian Institute of Technology Kharagpur
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3
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Pasha M, Tanaka F. Organocatalytic diastereo- and enantioselective oxa-hetero-Diels-Alder reactions of enones with aryl trifluoromethyl ketones for the synthesis of trifluoromethyl-substituted tetrahydropyrans. Org Biomol Chem 2021; 19:9242-9250. [PMID: 34661230 DOI: 10.1039/d1ob01844b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Tetrahydropyran derivatives are found in bioactives, and introduction of the trifluoromethyl group into molecules often improves biofunctions. Here we report diastereo- and enantioselective oxa-hetero-Diels-Alder reactions catalyzed by amine-based catalyst systems that afford trifluoromethyl-substituted tetrahydropyranones. Catalyst systems and conditions suitable for the reactions to provide the desired diastereomer products with high enantioselectivities were identified, and various trifluoromethyl-substituted tetrahydropyranones were synthesized with high diastereo- and enantioselectivities. Mechanistic investigation suggested that the reactions involve a [4 + 2] cycloaddition pathway, in which the enamine of the enone acts as the diene and the ketone carbonyl group of the aryl trifluoromethyl ketone acts as the dienophile. In this study, tetrahydropyran derivatives with the desired stereochemistry that are difficult to synthesize by previously reported methods were concisely obtained, and the range of tetrahydropyran derivatives that can be synthesized was expanded.
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Affiliation(s)
- Maira Pasha
- Chemistry and Chemical Bioengineering Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa 904-0495, Japan.
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna, Okinawa 904-0495, Japan.
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4
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Zhao H, Zhang Z, Lu W, Han P, Wang W, Jing L. 3-Carboxamide oxindoles as 1,3-C,N-bisnucleophiles for the highly diastereoselective synthesis of CF3-containing spiro-δ-lactam oxindoles featuring acyl at the ortho-position of spiro carbon atom. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153426] [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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5
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Ahmad T, Ullah N. The oxa-Michael reaction in the synthesis of 5- and 6-membered oxygen-containing heterocycles. Org Chem Front 2021. [DOI: 10.1039/d0qo01312a] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
In this review, we provide an updated account on the recent advances and applications of oxa-Michael reaction in the synthesis 5- and 6-membered monocyclic oxygen-containing heterocyclic compounds published in the literature since 2013 to date.
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Affiliation(s)
- Tauqir Ahmad
- Chemistry Department
- King Fahd University of Petroleum and Minerals
- Dhahran 31261
- Saudi Arabia
| | - Nisar Ullah
- Chemistry Department
- King Fahd University of Petroleum and Minerals
- Dhahran 31261
- Saudi Arabia
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6
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Tanaka F, Pasha M. Catalytic Enantioselective Oxa-Hetero-Diels-Alder Reactions of Enones with Aryl Trifluoromethyl Ketones: Synthesis of Tetrahydropyranones. HETEROCYCLES 2021. [DOI: 10.3987/com-20-s(k)22] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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7
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Shi L, Liu Y, Wang C, Yuan X, Liu X, Wu L, Pan Z, Yu Q, Xu C, Yang G. Synthesis of 1-(β-coumarinyl)-1-(β-indolyl)trifluoroethanols through regioselective Friedel-Crafts alkylation of indoles with β-(trifluoroacetyl)coumarins catalyzed by Sc(OTf) 3. RSC Adv 2020; 10:13929-13935. [PMID: 35498470 PMCID: PMC9051918 DOI: 10.1039/d0ra01237h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2020] [Accepted: 03/20/2020] [Indexed: 11/22/2022] Open
Abstract
A highly efficient Friedel-Crafts alkylation of indole derivatives with β-(trifluoroacetyl)coumarins using Sc(OTf)3 as a catalyst has been developed, which gives regioselective 1,2-adducts to afford 1-(β-coumarinyl)-1-(β-indolyl)trifluoroethanols. A series of tertiary trifluoroethanols containing different indole and coumarin groups were synthesized in moderate to excellent yields (up to 95%) in the presence of 5 mol% catalyst in a short time (only 2 minutes at least). A mechanism of the reaction, in which the trace amount of water plays the role of proton transfer in catalyzing circulation was proposed and confirmed.
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Affiliation(s)
- Lijun Shi
- School of Science, Henan Agricultural University Zhengzhou 450002 P. R. China
| | - Ying Liu
- School of Science, Henan Agricultural University Zhengzhou 450002 P. R. China
| | - Caixia Wang
- School of Science, Henan Agricultural University Zhengzhou 450002 P. R. China
| | - Xinxin Yuan
- College of Resource and Environment, Henan Agricultural University Zhengzhou 450002 P. R. China
| | - Xiaobiao Liu
- School of Science, Henan Agricultural University Zhengzhou 450002 P. R. China
| | - Lulu Wu
- School of Science, Henan Agricultural University Zhengzhou 450002 P. R. China
| | - Zhenliang Pan
- School of Science, Henan Agricultural University Zhengzhou 450002 P. R. China
| | - Qicheng Yu
- College of Animal Science and Veterinary Medicine, Henan Agricultural University Zhengzhou 450002 P. R. China
| | - Cuilian Xu
- School of Science, Henan Agricultural University Zhengzhou 450002 P. R. China
| | - Guoyu Yang
- School of Science, Henan Agricultural University Zhengzhou 450002 P. R. China
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8
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Guan XK, Liu GF, An D, Zhang H, Zhang SQ. Chiral Imidodiphosphoric Acid-Catalyzed Highly Diastereo- and Enantioselective Synthesis of Poly-Substituted 3,4-Dihydro-2H-pyrans: [4 + 2] Cycloadditions of β,γ-Unsaturated α-Ketoesters and 3-Vinylindoles. Org Lett 2019; 21:5438-5442. [DOI: 10.1021/acs.orglett.9b01675] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Xu-Kai Guan
- College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Guo-Feng Liu
- College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Dong An
- College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Heng Zhang
- College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
| | - Suo-Qin Zhang
- College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun 130012, China
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9
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He X, Ji Y, Peng C, Han B. Organocatalytic Asymmetric Synthesis of Cyclic Compounds Bearing a Trifluoromethylated Stereogenic Center: Recent Developments. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201801647] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Xiang‐Hong He
- State Key Laboratory of Southwestern Chinese Medicine ResourcesChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
| | - Yan‐Ling Ji
- State Key Laboratory of Southwestern Chinese Medicine ResourcesChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
| | - Cheng Peng
- State Key Laboratory of Southwestern Chinese Medicine ResourcesChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
- Ministry of Education Key Laboratory of Standardization of Chinese Medicine, School of PharmacyChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
| | - Bo Han
- State Key Laboratory of Southwestern Chinese Medicine ResourcesChengdu University of Traditional Chinese Medicine Chengdu 611137 People's Republic of China
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10
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Kano T, Maruyama H, Homma C, Maruoka K. Catalyst-controlled diastereoselectivity reversal in the formation of dihydropyrans. Chem Commun (Camb) 2018; 54:3496-3499. [DOI: 10.1039/c8cc01443d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In dihydropyran synthesis, use of (S)-3b is crucial for overcoming the inherent trans-selectivity and obtaining unusual cis-adducts with high enantioselectivity.
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Affiliation(s)
- Taichi Kano
- Department of Chemistry
- Graduate School of Science
- Kyoto University
- Sakyo
- Kyoto 606-8502
| | - Hiroki Maruyama
- Department of Chemistry
- Graduate School of Science
- Kyoto University
- Sakyo
- Kyoto 606-8502
| | - Chihiro Homma
- Department of Chemistry
- Graduate School of Science
- Kyoto University
- Sakyo
- Kyoto 606-8502
| | - Keiji Maruoka
- Department of Chemistry
- Graduate School of Science
- Kyoto University
- Sakyo
- Kyoto 606-8502
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11
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Anebouselvy K, Shruthi KS, Ramachary DB. Asymmetric Supramolecular Organocatalysis: A Complementary Upgrade to Organocatalysis. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700611] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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12
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Varela I, Faustino H, Díez E, Iglesias-Sigüenza J, Grande-Carmona F, Fernández R, Lassaletta JM, Mascareñas JL, López F. Gold(I)-Catalyzed Enantioselective [2+2+2] Cycloadditions: An Expedient Entry to Enantioenriched Tetrahydropyran Scaffolds. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03651] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Iván Varela
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CiQUS) and Departamento de Química
Orgánica, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Hélio Faustino
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CiQUS) and Departamento de Química
Orgánica, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Elena Díez
- Departamento de
Química Orgánica, C/Prof.
García González, 1, 41012 Sevilla, Spain
| | | | | | - Rosario Fernández
- Departamento de
Química Orgánica, C/Prof.
García González, 1, 41012 Sevilla, Spain
| | - José M. Lassaletta
- Instituto
Investigaciones Químicas, CSIC-USe, Avda. Américo Vespucio, 49, 41092 Sevilla, Spain
| | - José L. Mascareñas
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CiQUS) and Departamento de Química
Orgánica, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
| | - Fernando López
- Centro
Singular de Investigación en Química Biolóxica
e Materiais Moleculares (CiQUS) and Departamento de Química
Orgánica, Universidad de Santiago de Compostela, 15782 Santiago de Compostela, Spain
- Instituto
de Química Orgánica General, CSIC, Juan de la Cierva
3, 28006 Madrid, Spain
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13
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Becerra-Figueroa L, Brun E, Mathieson M, Farrugia LJ, Wilson C, Prunet J, Gamba-Sánchez D. Diastereoselective synthesis of trifluoromethylated 1,3-dioxanes by intramolecular oxa-Michael reaction. Org Biomol Chem 2017; 15:301-305. [PMID: 27897299 DOI: 10.1039/c6ob02333a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A highly diastereoselective synthesis of trifluoromethylated 1,3-dioxanes is described. The reaction proceeds by an addition/oxa-Michael sequence and works efficiently under mild reaction conditions, with a good substrate scope and acceptable to good yields.
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Affiliation(s)
- Liliana Becerra-Figueroa
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogotá 111711, Colombia.
| | - Elodie Brun
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Michael Mathieson
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Louis J Farrugia
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Claire Wilson
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Joëlle Prunet
- WestCHEM, School of Chemistry, University of Glasgow, Joseph Black Building, University Avenue, Glasgow G12 8QQ, UK
| | - Diego Gamba-Sánchez
- Laboratory of Organic Synthesis, Bio and Organocatalysis, Chemistry Department, Universidad de los Andes, Cra 1 No. 18A-12 Q:305, Bogotá 111711, Colombia.
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14
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Duan J, Cheng Y, Cheng J, Li R, Li P. Organocatalytic Asymmetric Benzylation and Aldol-Hemiacetalization of α,β-Unsaturated Trifluoromethyl Ketones: Efficient Enantioselective Construction of 3,4-Dihydroisocoumarins. Chemistry 2016; 23:519-523. [DOI: 10.1002/chem.201604920] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Jindian Duan
- Department of Chemistry; South University of Science and Technology of China; 1088 Xueyuan Blvd., Nanshan District Shenzhen, Guangdong 518055 P. R. China
| | - Yuyu Cheng
- Department of Chemistry; South University of Science and Technology of China; 1088 Xueyuan Blvd., Nanshan District Shenzhen, Guangdong 518055 P. R. China
| | - Jing Cheng
- Department of Chemistry; South University of Science and Technology of China; 1088 Xueyuan Blvd., Nanshan District Shenzhen, Guangdong 518055 P. R. China
| | - Rou Li
- Department of Chemistry; South University of Science and Technology of China; 1088 Xueyuan Blvd., Nanshan District Shenzhen, Guangdong 518055 P. R. China
| | - Pengfei Li
- Department of Chemistry; South University of Science and Technology of China; 1088 Xueyuan Blvd., Nanshan District Shenzhen, Guangdong 518055 P. R. China
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15
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Ramachary DB, Reddy PS, Shruthi KS, Madhavachary R, Reddy PVG. A Brønsted Acid-Primary Amine as a Synergistic Catalyst for Stereoselective Asymmetric Diels-Alder Reactions. European J Org Chem 2016. [DOI: 10.1002/ejoc.201601011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dhevalapally B. Ramachary
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; 500046 Hyderabad Telangana India
| | - P. Sreekanth Reddy
- Department of Chemistry; Yogi Vemana University; 516003 Kadapa Andhra Pradesh India
| | - Kodambahalli S. Shruthi
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; 500046 Hyderabad Telangana India
| | - R. Madhavachary
- Catalysis Laboratory; School of Chemistry; University of Hyderabad; 500046 Hyderabad Telangana India
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16
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Yang L, Huang W, He XH, Yang MC, Li X, He G, Peng C, Han B. Stereoselective Synthesis of Hydropyrano[3,2-b
]indoles via
Organocatalytic Asymmetric Inverse-Electron-Demand Oxa-Diels-Alder Reaction. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201600465] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Lei Yang
- State Key Laboratory Breeding Base of Systematic Research; Development and Utilization of Chinese Medicine Resources; Chengdu University of Traditional Chinese Medicine; Chengdu 611137 People's Republic of China
| | - Wei Huang
- State Key Laboratory Breeding Base of Systematic Research; Development and Utilization of Chinese Medicine Resources; Chengdu University of Traditional Chinese Medicine; Chengdu 611137 People's Republic of China
| | - Xiang-Hong He
- State Key Laboratory Breeding Base of Systematic Research; Development and Utilization of Chinese Medicine Resources; Chengdu University of Traditional Chinese Medicine; Chengdu 611137 People's Republic of China
| | - Ming-Cheng Yang
- State Key Laboratory Breeding Base of Systematic Research; Development and Utilization of Chinese Medicine Resources; Chengdu University of Traditional Chinese Medicine; Chengdu 611137 People's Republic of China
| | - Xiang Li
- State Key Laboratory Breeding Base of Systematic Research; Development and Utilization of Chinese Medicine Resources; Chengdu University of Traditional Chinese Medicine; Chengdu 611137 People's Republic of China
| | - Gu He
- State Key Laboratory of Biotherapy; West China Hospital; Sichuan University; Chengdu 610041 People's Republic of China
| | - Cheng Peng
- State Key Laboratory Breeding Base of Systematic Research; Development and Utilization of Chinese Medicine Resources; Chengdu University of Traditional Chinese Medicine; Chengdu 611137 People's Republic of China
| | - Bo Han
- State Key Laboratory Breeding Base of Systematic Research; Development and Utilization of Chinese Medicine Resources; Chengdu University of Traditional Chinese Medicine; Chengdu 611137 People's Republic of China
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17
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Zhang D, Tanaka F. Catalytic enantioselective oxa-hetero-Diels–Alder reactions of enones with aryl trifluoromethyl ketones. RSC Adv 2016. [DOI: 10.1039/c6ra13859d] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
Abstract
Asymmetric oxa-hetero-Diels–Alder reactions of enones with aryl trifluoromethyl ketones were developed to afford tetrahydropyranones bearing trifluoromethyl-substituted tetrasubstituted carbon centers.
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Affiliation(s)
- Dongxin Zhang
- Chemistry and Chemical Bioengineering Unit
- Okinawa Institute of Science and Technology Graduate University
- Onna
- Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit
- Okinawa Institute of Science and Technology Graduate University
- Onna
- Japan
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18
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Cui HL, Chouthaiwale PV, Yin F, Tanaka F. Catalytic asymmetric hetero-Diels–Alder reactions of enones with isatins to access functionalized spirooxindole tetrahydropyrans: scope, derivatization, and discovery of bioactives. Org Biomol Chem 2016; 14:1777-83. [DOI: 10.1039/c5ob02393a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Concise hetero-Diels–Alder reactions were developed to provide various functionalized spirooxindole tetrahydropyrans useful for the discovery of bioactive molecules.
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Affiliation(s)
- Hai-Lei Cui
- Chemistry and Chemical Bioengineering Unit
- Okinawa Institute of Science and Technology Graduate University
- Onna
- Japan
| | - Pandurang V. Chouthaiwale
- Chemistry and Chemical Bioengineering Unit
- Okinawa Institute of Science and Technology Graduate University
- Onna
- Japan
| | - Feng Yin
- Chemistry and Chemical Bioengineering Unit
- Okinawa Institute of Science and Technology Graduate University
- Onna
- Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit
- Okinawa Institute of Science and Technology Graduate University
- Onna
- Japan
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19
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Cui HL, Chouthaiwale PV, Yin F, Tanaka F. Reaction-Based Mechanistic Investigations of Asymmetric Hetero-Diels-Alder Reactions of Enones with Isatins Catalyzed by Amine-Based Three-Component Catalyst Systems. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500412] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Hai-Lei Cui
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
| | - Pandurang V. Chouthaiwale
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
| | - Feng Yin
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
| | - Fujie Tanaka
- Chemistry and Chemical Bioengineering Unit; Okinawa Institute of Science and Technology Graduate University; 1919-1 Tancha, Onna Okinawa 904-0495 Japan
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