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Volumn , Issue 11, 1998, Pages 1223-1226

Stereoselective synthesis of the C1-C5 dienoic sub-unit of bafilomycins via a γ-sulfonyl-δ-lactone intermediate

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Indexed keywords


EID: 0009579321     PISSN: 09365214     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-1998-1903     Document Type: Article
Times cited : (7)

References (43)
  • 26
    • 0003620128 scopus 로고
    • Tetrahedron Organic Chemistry Series, Baldwin, J. E. and Magnus, P. D. Eds, Pergamon Press, Oxford
    • For a monography: Simpkins, N. S. "Sulphones in Organic Chemistry" in Tetrahedron Organic Chemistry Series, Baldwin, J. E. and Magnus, P. D. Eds, Pergamon Press, Oxford, 1993.
    • (1993) Sulphones in Organic Chemistry
    • Simpkins, N.S.1
  • 31
    • 26844437116 scopus 로고    scopus 로고
    • Synthesis of sulfones 3 and 4 will be published elsewhere
    • Synthesis of sulfones 3 and 4 will be published elsewhere.
  • 32
    • 26844540676 scopus 로고    scopus 로고
    • In comparative experiments, the reaction of the anion derived from 4-desmethylsulfone analogue of 3 with benzaldehyde or 3-phenylpropionaldehyde led to the expected condensation products in 80-85% yields
    • In comparative experiments, the reaction of the anion derived from 4-desmethylsulfone analogue of 3 with benzaldehyde or 3-phenylpropionaldehyde led to the expected condensation products in 80-85% yields.
  • 33
    • 0000898481 scopus 로고
    • This chiral aldehyde was synthesized by ozonolysis of the corresponding Hoppe's homoaldolisation vinylcarbamate adduct prepared for other synthetic work in our laboratories (unpublished results), see Hoppe, D.; Hanko, R.; Brönneke, A.; Lichtenberg, F.; van Hülsen, E. Chem. Ber. 1985, 118, 2822.
    • (1985) Chem. Ber. , vol.118 , pp. 2822
    • Hoppe, D.1    Hanko, R.2    Brönneke, A.3    Lichtenberg, F.4    Van Hülsen, E.5
  • 34
    • 26844531931 scopus 로고    scopus 로고
    • Hydroxysulfones 6a,b were obtained as 3:1 and 1:1 diastereomeric mixtures respectively whereas the corresponding lactones 7a,b were obtained as 2:1 and 6:5 mixtures. Interestingly, lactone 7c only exists as a ca. 2:1 diastereomeric mixture which probably indicates an efficient diastereoselective Felkin-Ahn controlled condensation
    • Hydroxysulfones 6a,b were obtained as 3:1 and 1:1 diastereomeric mixtures respectively whereas the corresponding lactones 7a,b were obtained as 2:1 and 6:5 mixtures. Interestingly, lactone 7c only exists as a ca. 2:1 diastereomeric mixture which probably indicates an efficient diastereoselective Felkin-Ahn controlled condensation.
  • 35
    • 3242892786 scopus 로고
    • Obtention of δ-lactones after condensation of dianions derived from 4-(phenylsulfonyl)butanoic acid on aldehydes followed by acidic work-up has been precedented whereas the course of the subsequent Na/Hg reductive elimination step has been shown to involve an initial methanolysis of the lactone function, a fact which has not been observed in our examples : Thompson, C. M.; Frick, J. A. J. Org. Chem., 1989, 54, 890.
    • (1989) J. Org. Chem. , vol.54 , pp. 890
    • Thompson, C.M.1    Frick, J.A.2
  • 41
    • 26844539867 scopus 로고    scopus 로고
    • note
    • 2O as above.
  • 42
    • 26844561456 scopus 로고    scopus 로고
    • Calculations including molecular dynamics minimisations via MM2 force fields, MOPAC semi-empirical calculations (MINDO/3) and Monte Carlo research of conformers have been carried out with Macromodel V5.0 (Columbia University) and CS Chemdraw 3D Pro softwares (with H or Me instead of Na when this later was unparametrized).
    • Calculations including molecular dynamics minimisations via MM2 force fields, MOPAC semi-empirical calculations (MINDO/3) and Monte Carlo research of conformers have been carried out with Macromodel V5.0 (Columbia University) and CS Chemdraw 3D Pro softwares (with H or Me instead of Na when this later was unparametrized).


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