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Harkiss AH, Sutherland A. Access to 2,6-Disubstituted 4-Oxopiperidines Using a 6-Endo-trig Cyclization: Stereoselective Synthesis of Spruce Alkaloid and (+)-241D. J Org Chem 2018; 83:535-542. [PMID: 29218988 DOI: 10.1021/acs.joc.7b02799] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A synthetic route to cis-2-methyl-4-oxo-6-alkylpiperidines has been developed using a 6-endo-trig cyclization of (E)-enones. The base-mediated intramolecular cyclization was found to be general for both alkyl- and aryl-substituted enones, providing the corresponding 4-oxopiperidines in high yields (80-89%). Stereoselective reduction of the 2,6-cis-disubstituted 4-oxopiperidines then gave the 2,4,6-cis,cis-trisubstituted 4-hydroxypiperidines in high diastereoselectivity. The general nature of this approach was demonstrated with the synthesis of the natural products, spruce alkaloid and (+)-241D.
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Affiliation(s)
- Alexander H Harkiss
- WestCHEM, School of Chemistry, The Joseph Black Building, University of Glasgow , Glasgow G12 8QQ, United Kingdom
| | - Andrew Sutherland
- WestCHEM, School of Chemistry, The Joseph Black Building, University of Glasgow , Glasgow G12 8QQ, United Kingdom
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Darses B, Michaelides IN, Sladojevich F, Ward JW, Rzepa PR, Dixon DJ. Expedient Construction of the [7–5–5] All-Carbon Tricyclic Core of the Daphniphyllum Alkaloids Daphnilongeranin B and Daphniyunnine D. Org Lett 2012; 14:1684-7. [DOI: 10.1021/ol3002267] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Benjamin Darses
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K., Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Syngenta, Jealott’s Hill International Research Centre Bracknell, Berkshire RG42 6EY, U.K
| | - Iacovos N. Michaelides
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K., Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Syngenta, Jealott’s Hill International Research Centre Bracknell, Berkshire RG42 6EY, U.K
| | - Filippo Sladojevich
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K., Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Syngenta, Jealott’s Hill International Research Centre Bracknell, Berkshire RG42 6EY, U.K
| | - John W. Ward
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K., Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Syngenta, Jealott’s Hill International Research Centre Bracknell, Berkshire RG42 6EY, U.K
| | - Paula R. Rzepa
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K., Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Syngenta, Jealott’s Hill International Research Centre Bracknell, Berkshire RG42 6EY, U.K
| | - Darren J. Dixon
- Chemistry Research Laboratory, Department of Chemistry, University of Oxford, Mansfield Road, Oxford, OX1 3TA, U.K., Department of Chemistry, University of Manchester, Oxford Road, Manchester, M13 9PL, U.K., and Syngenta, Jealott’s Hill International Research Centre Bracknell, Berkshire RG42 6EY, U.K
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Yan B, Spilling CD. Synthesis of Cyclopentenones via Intramolecular HWE and the Palladium-Catalyzed Reactions of Allylic Hydroxy Phosphonate Derivatives. J Org Chem 2008; 73:5385-96. [DOI: 10.1021/jo8004028] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Bingli Yan
- Department of Chemistry and Biochemistry, University of Missouri−St. Louis, One University Boulevard, St. Louis, Missouri 63121-4499
| | - Christopher D. Spilling
- Department of Chemistry and Biochemistry, University of Missouri−St. Louis, One University Boulevard, St. Louis, Missouri 63121-4499
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