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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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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: 9] [Impact Index Per Article: 2.3] [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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Just-Baringo X, Clark J, Gutmann MJ, Procter DJ. Selective Synthesis of Cyclooctanoids by Radical Cyclization of Seven-Membered Lactones: Neutron Diffraction Study of the Stereoselective Deuteration of a Chiral Organosamarium Intermediate. Angew Chem Int Ed Engl 2016; 55:12499-502. [PMID: 27600354 PMCID: PMC5113801 DOI: 10.1002/anie.201606792] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Indexed: 11/09/2022]
Abstract
Seven-membered lactones undergo selective SmI2 -H2 O-promoted radical cyclization to form substituted cyclooctanols. The products arise from an exo-mode of cyclization rather than the usual endo-attack employed in the few radical syntheses of cyclooctanes. The process is terminated by the quenching of a chiral benzylic samarium. A labeling experiment and neutron diffraction study have been used for the first time to probe the configuration and highly diastereoselective deuteration of a chiral organosamarium intermediate.
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Affiliation(s)
| | - Jemma Clark
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK
| | - Matthias J Gutmann
- ISIS Facility, Rutherford Appleton Laboratory, Chilton, Didcot, Oxfordshire, OX11 0QX, UK
| | - David J Procter
- School of Chemistry, University of Manchester, Manchester, M13 9PL, UK.
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Just-Baringo X, Clark J, Gutmann MJ, Procter DJ. Selective Synthesis of Cyclooctanoids by Radical Cyclization of Seven-Membered Lactones: Neutron Diffraction Study of the Stereoselective Deuteration of a Chiral Organosamarium Intermediate. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201606792] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Jemma Clark
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
| | - Matthias J. Gutmann
- ISIS Facility; Rutherford Appleton Laboratory; Chilton, Didcot Oxfordshire OX11 0QX UK
| | - David J. Procter
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
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