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Michael JP, de Koning CB, Malefetse TJ, Yillah I. Preparation and reductive transformations of vinylogous sulfonamides (β-sulfonyl enamines), and application to the synthesis of indolizidines. Org Biomol Chem 2004; 2:3510-7. [PMID: 15565245 DOI: 10.1039/b413379j] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Condensation between the methiodide salts of 1-alkylpyrrolidine-2-thiones and ethyl [(4-methylphenyl)sulfonyl]acetate or 1-[(4-methylphenyl)sulfonyl]propan-2-one afforded several 2-[[(4-methylphenyl)sulfonyl]methylene]pyrrolidines in good yield. These beta-sulfonyl enamines are sufficiently nucleophilic for cyclisation with internal electrophiles to give sulfone-substituted indolizines, potentially useful scaffolds for alkaloid synthesis. The carbon-carbon double bond in vinylogous sulfonamides was reduced stereoselectively either by catalytic hydrogenation or by treatment with sodium borohydride to yield beta-sulfonyl amines. The sulfone group in beta-acyl-beta-sulfonyl enamines could be removed by hydrogenolysis with sodium amalgam in THF-methanol to give enaminones.
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Affiliation(s)
- Joseph P Michael
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, P.O. Wits 2050, South Africa.
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Martinez RA, Alvarez MA, Velarde SP, Silks LA“P, Stotter PL, Schmidt JG, Unkefer CJ. Large-Scale Preparation of [13C]Methyl Phenyl Sulfide from [13C]Methanol by a One-Step Process. Org Process Res Dev 2002. [DOI: 10.1021/op025530p] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Rodolfo A. Martinez
- National Stable Isotope Resource, Szilard Resource, Bioscience Division, MS E529, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and College of Sciences, University of Texas at San Antonio, San Antonio, Texas 78249, U.S.A
| | - Marc A. Alvarez
- National Stable Isotope Resource, Szilard Resource, Bioscience Division, MS E529, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and College of Sciences, University of Texas at San Antonio, San Antonio, Texas 78249, U.S.A
| | - Stephen P. Velarde
- National Stable Isotope Resource, Szilard Resource, Bioscience Division, MS E529, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and College of Sciences, University of Texas at San Antonio, San Antonio, Texas 78249, U.S.A
| | - Louis A. “Pete” Silks
- National Stable Isotope Resource, Szilard Resource, Bioscience Division, MS E529, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and College of Sciences, University of Texas at San Antonio, San Antonio, Texas 78249, U.S.A
| | - Philip L. Stotter
- National Stable Isotope Resource, Szilard Resource, Bioscience Division, MS E529, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and College of Sciences, University of Texas at San Antonio, San Antonio, Texas 78249, U.S.A
| | - Jürgen G. Schmidt
- National Stable Isotope Resource, Szilard Resource, Bioscience Division, MS E529, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and College of Sciences, University of Texas at San Antonio, San Antonio, Texas 78249, U.S.A
| | - Clifford J. Unkefer
- National Stable Isotope Resource, Szilard Resource, Bioscience Division, MS E529, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, and College of Sciences, University of Texas at San Antonio, San Antonio, Texas 78249, U.S.A
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