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Liyanage Perera E, Lee D. Hydrogen Bonding-directed Sequential 1,6/1,4-Addition of Heteroatom Nucleophiles onto Electron-deficient 1,3-Diynes. Org Chem Front 2022. [DOI: 10.1039/d2qo01730j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The hydrogen bonding-directed sequential 1,6/1,4-additions developed herein allow for creating unique heterocycles with structural diversity under mild conditions without using metal catalysts or organometallic reagents.
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Affiliation(s)
- Erandi Liyanage Perera
- Department of Chemistry, University of Illinois Chicago, 845 West Taylor Street, Chicago, IL 60607, USA
| | - Daesung Lee
- Department of Chemistry, University of Illinois Chicago, 845 West Taylor Street, Chicago, IL 60607, USA
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2
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Liang Y, Kan C, Barve BD, Kuo Y, Fang H, Li W. Metal‐Free, Base‐Promoted, Tandem Pericyclic Reaction: A One‐Pot Approach for Cycloheptane‐Annelated Chromones from γ‐Alkynyl‐1,3‐Diketones. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202100956] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yi‐En Liang
- National Research Institute of Chinese Medicine Ministry of Health and Welfare Taipei 11221 Taiwan, R.O.C
- Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei 10608 Taiwan, R.O.C
| | - Chih‐Yu Kan
- National Research Institute of Chinese Medicine Ministry of Health and Welfare Taipei 11221 Taiwan, R.O.C
| | - Balaji D. Barve
- National Research Institute of Chinese Medicine Ministry of Health and Welfare Taipei 11221 Taiwan, R.O.C
- Department of Chemistry National Taiwan Normal University Taipei 10610 Taiwan, R.O.C
| | - Yao‐Haur Kuo
- National Research Institute of Chinese Medicine Ministry of Health and Welfare Taipei 11221 Taiwan, R.O.C
| | - Hsu‐Wei Fang
- Department of Chemical Engineering and Biotechnology National Taipei University of Technology Taipei 10608 Taiwan, R.O.C
| | - Wen‐Tai Li
- National Research Institute of Chinese Medicine Ministry of Health and Welfare Taipei 11221 Taiwan, R.O.C
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3
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DeLomba WC, Stone EA, Alley KA, Iannarone V, Tarsis E, Ovaska S, Ovaska TV. Utilization of the Thorpe-Ingold Effect in the Synthesis of Cyclooctanoid Ring Systems via Anionic 6- exo- dig Cyclization/Claisen Rearrangement Sequence. J Org Chem 2020; 85:9464-9474. [PMID: 32687712 DOI: 10.1021/acs.joc.0c01132] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We demonstrate a facile approach for the synthesis of gem-disubstituted cyclooctanoids, a motif found in several biologically active compounds. Appropriately substituted 1-alkenyl-5-pentyn-1-ols bearing gem-dialkyl substituents at either the C2, C3, or C4 position serve as useful precursors to a number of cyclooct-4-enone derivatives via a tandem, microwave-assisted oxyanionic 6-exo-dig cyclization/Claisen rearrangement reaction. gem-Dialkyl activation is necessary for these reactions to occur, as unactivated 1-alkenyl-5-pentyn-1-ols fail to undergo 6-exo-dig cyclization under the conditions employed. Further application of the methodology to the corresponding gem-dialkoxy system was also explored to facilitate access to more complex carbocycles.
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Affiliation(s)
- Weston C DeLomba
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States
| | - Elizabeth A Stone
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States
| | - Kimberly A Alley
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States
| | - Victoria Iannarone
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States
| | - Emily Tarsis
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States
| | - Sami Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States
| | - Timo V Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States
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4
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Phan Thi Thanh N, Tone M, Inoue H, Fujisawa I, Iwasa S. Highly stereoselective intramolecular Buchner reaction of diazoacetamides catalyzed by a Ru(ii)–Pheox complex. Chem Commun (Camb) 2019; 55:13398-13401. [DOI: 10.1039/c9cc06889a] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This work reports the first efficient enantioselective intramolecular Buchner reaction of diazoacetamides.
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Affiliation(s)
- Nga Phan Thi Thanh
- Department of Applied Chemistry and Life Science
- Toyohashi University of Technology
- Toyohashi
- Japan
| | - Masaya Tone
- Department of Applied Chemistry and Life Science
- Toyohashi University of Technology
- Toyohashi
- Japan
| | - Hayato Inoue
- Department of Applied Chemistry and Life Science
- Toyohashi University of Technology
- Toyohashi
- Japan
| | - Ikuhide Fujisawa
- Department of Applied Chemistry and Life Science
- Toyohashi University of Technology
- Toyohashi
- Japan
| | - Seiji Iwasa
- Department of Applied Chemistry and Life Science
- Toyohashi University of Technology
- Toyohashi
- Japan
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5
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Ray JK, Paul S, Ray P, Singha R, Rao DY, Nandi S, Anoop A. Pd-catalyzed intramolecular sequential Heck cyclization and oxidation reactions: a facile pathway for the synthesis of substituted cycloheptenone evaluated using computational studies. NEW J CHEM 2017. [DOI: 10.1039/c6nj02694j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A synthetic and theoretical approach towards the synthesis of cycloheptenone via palladium-catalyzed 7-exo-trig cyclization followed by the oxidation of cyclized alcohol.
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Affiliation(s)
- Jayanta K. Ray
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | - Sunanda Paul
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | - Paramita Ray
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | - Raju Singha
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | | | - Surajit Nandi
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
| | - Anakuthil Anoop
- Department of Chemistry
- Indian Institute of Technology Kharagpur
- Kharagpur 721302
- India
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6
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Zhou P, Hao WJ, Zhang JP, Jiang B, Li G, Tu SJ. Cascade bicyclizations of o-alkynyl aldehydes with thiazolium salts: a new access toward poly-functionalized indeno[2,1-b]pyrroles. Chem Commun (Camb) 2016; 51:13012-5. [PMID: 26178784 DOI: 10.1039/c5cc04306a] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new cascade bicyclization of o-alkynyl aldehydes with thiazolium salts is described, in which 25 examples of densely functionalized indeno[2,1-b]pyrroles are achieved in a functional-group-compatible manner. Thiazole carbenes generated in situ from thiazolium salts play dual roles as reaction partners and as NHC catalysts. The synthetic utility of these bicyclization reactions results in subsequent C-C bond-forming events to rapidly build up molecular complexity.
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Affiliation(s)
- Peng Zhou
- Jiangsu Key Laboratory of Green Synthetic Chemistry for Functional Materials, Jiangsu Normal University, Xuzhou, 211116, P. R. China.
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7
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VanHeyst MD, Wright DL. The Frondosins: An Unusual Synthetic and Stereochemical Journey. European J Org Chem 2014. [DOI: 10.1002/ejoc.201403116] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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8
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Feldman AW, Ovaska SI, Ovaska TV. Facile Access to Cyclooctanoid Ring Systems via Microwave-Assisted Tandem 6-exo dig Cyclization-Rearrangement Sequence. Tetrahedron 2014; 70:4147-4155. [PMID: 24994941 DOI: 10.1016/j.tet.2014.02.089] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Appropriately substituted 5-alkyn-1-ol systems bearing a nitrile moiety at the triple bond serve as versatile precursors to a variety of cyclooctenone derivatives via a "one-pot" base-catalyzed oxyanionic 6-exo dig cyclization/Claisen rearrangement sequence under microwave irradiation. It was found that the initially formed cyclic intermediate consists of a mixture of endo and exocyclic isomers, which appear to be in equilibrium under the reaction conditions. However, the only observed products from these reactions are α-cyano substituted cyclooctenones, derived from the exocyclic dihydrofuran intermediates.
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Affiliation(s)
- Aaron W Feldman
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States of America
| | - Sami I Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States of America
| | - Timo V Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, United States of America
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9
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Wang X, Cheng G, Cui X. Tandem synthesis of 3-allyl-chromones from alkynones and allylic alcohols under metal-free conditions. Chem Commun (Camb) 2014; 50:652-4. [DOI: 10.1039/c3cc48259f] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Wang XQ, Jia PJ, Liu SP, Yu W. TBAF-catalyzed cyclization of 6-hydroxyhex-2-ynoates and 7-hydroxyhept-2-ynoates. CHINESE CHEM LETT 2011. [DOI: 10.1016/j.cclet.2011.01.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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11
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Ovaska TV. Synthesis of cycloheptanoid natural products via tandem 5-exo cyclization/Claisen rearrangement process. ARKIVOC 2010; 2011:34-44. [PMID: 22514791 PMCID: PMC3327132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023] Open
Abstract
This article describes the development of microwave-assisted oxyanionic 5-exo-dig cyclization-Claisen rearrangement sequence as a convenient "one-pot" route to a variety of seven-membered carbocyclic ring systems. This process was used as the key transformation for the construction of several natural products, including frondosins A, B, and C.
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Affiliation(s)
- Timo V Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, CT 06320,
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12
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Ovaska TV, Sullivan JA, Ovaska SI, Winegrad JB, Fair JD. Asymmetric synthesis of seven-membered carbocyclic rings via a sequential oxyanionic 5-exo-dig cyclization/claisen rearrangement process. Total synthesis of (-)-frondosin B. Org Lett 2009; 11:2715-8. [PMID: 19514798 DOI: 10.1021/ol900967j] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Appropriately substituted nonracemic allyl alcohols, readily prepared from the corresponding enones by application of the CBS methodology, were converted to optically active cycloheptenone derivatives with almost complete transfer of chirality via an efficient "one-pot", cycloisomerization/Claisen rearrangement process. This methodology was directly applied to the expedient total synthesis of (-)-frondosin B.
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Affiliation(s)
- Timo V Ovaska
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, USA.
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13
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Li X, Keon AE, Sullivan JA, Ovaska TV. Studies toward frondosin A and its analogues. Formal total synthesis of (+/-)-frondosin A. Org Lett 2008; 10:3287-90. [PMID: 18611033 DOI: 10.1021/ol8011343] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two reaction sequences commencing with different starting materials were successfully employed for the synthesis of frondosin A analogues, including (+/-)-frondosin A dimethyl ether. Construction of the bicyclo[5.4.0]undecane core in each case was achieved through an expedient microwave-assisted tandem 5-exo cyclization--Claisen rearrangement process.
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Affiliation(s)
- Xin Li
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, USA
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14
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Bae H, Baskar B, An S, Cheong J, Thangadurai D, Hwang IC, Rhee Y. Gold(I)-Catalyzed Cycloisomerization of 3-Methoxy-1,6-enynes Featuring Tandem Cyclization and [3,3]-Sigmatropic Rearrangement. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200705117] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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15
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Bae H, Baskar B, An S, Cheong J, Thangadurai D, Hwang IC, Rhee Y. Gold(I)-Catalyzed Cycloisomerization of 3-Methoxy-1,6-enynes Featuring Tandem Cyclization and [3,3]-Sigmatropic Rearrangement. Angew Chem Int Ed Engl 2008; 47:2263-6. [DOI: 10.1002/anie.200705117] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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16
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Abstract
An expeditious reaction sequence featuring a microwave-assisted tandem 5-exo cyclization-Claisen rearrangement process was used to assemble the A/B ring system of frondosin B. Completion of the target natural product was achieved in 38.2% yield over an eight-step linear sequence.
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Affiliation(s)
- Xin Li
- Department of Chemistry, Connecticut College, 270 Mohegan Avenue, New London, Connecticut 06320, USA
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