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Volumn , Issue 1, 2007, Pages 118-130

Tandem Claisen condensation/transesterification between arylacetate enolates and arylmethylene-substituted 2,2-dimethyl-1,3-dioxolan-4-ones: An improved synthesis of z-configured pulvinones

Author keywords

oxocarboxylates; Crossed Claisen condensation; Horner Wadsworth Emmons alkenation; O protected hydroxyacrylates; Stereoselective synthesis

Indexed keywords

ALPHA;-OXOCARBOXYLATES; CROSSED CLAISEN CONDENSATION; HORNER-WADSWORTH-EMMONS ALKENATION; O-PROTECTED Α-HYDROXYACRYLATES; STEREOSELECTIVE SYNTHESIS;

EID: 33947496873     PISSN: 00397881     EISSN: None     Source Type: Journal    
DOI: 10.1055/s-2006-950378     Document Type: Article
Times cited : (14)

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    • In a related condensation using lithium diisopropylamide/ ester 26/dioxolanone 25c, we ascertained that the yield of pulvinone 28 decreased from 60% to 40% upon changing the reactant ratio from 2.5:2.5:1 to 2.5:1.25:1 (Scheme 4). The analogous condensation using lithium diisopropylamide/ carboxylic acid 27/dioxolanone 25c (2.2:1.1:1 ratio of the reactants) did not give pulvinone 28 under the conditions otherwise identical to those of Table 5 (Kaczybura, N. Dissertation; Universität Freiburg: Germany, 2005). (Chemical Equation Presented)
    • In a related condensation using lithium diisopropylamide/ ester 26/dioxolanone 25c, we ascertained that the yield of pulvinone 28 decreased from 60% to 40% upon changing the reactant ratio from 2.5:2.5:1 to 2.5:1.25:1 (Scheme 4). The analogous condensation using lithium diisopropylamide/ carboxylic acid 27/dioxolanone 25c (2.2:1.1:1 ratio of the reactants) did not give pulvinone 28 under the conditions otherwise identical to those of Table 5 (Kaczybura, N. Dissertation; Universität Freiburg: Germany, 2005). (Chemical Equation Presented)
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    • Pulvinone (Z)-8j was synthesized in a mixture which also contained the isomeric pulvinone (Z)-5-(3,4-dimethoxybenzylidene)-4- hydroxy-3-(4-methoxyphenyl)furan-2(5H)-one: Edwards, R. L.; Gill, M. J. Chem. Soc., Perkin Trans. 1 1973, 1921.
    • Pulvinone (Z)-8j was synthesized in a mixture which also contained the isomeric pulvinone (Z)-5-(3,4-dimethoxybenzylidene)-4- hydroxy-3-(4-methoxyphenyl)furan-2(5H)-one: Edwards, R. L.; Gill, M. J. Chem. Soc., Perkin Trans. 1 1973, 1921.
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    • We could not extend our approach to a synthesis of pulvinic acids 32 and 33. While dioxolanone 31 was accessible by a Horner-Wadsworth-Emmons reaction between phosphonate 24b and α-oxo ester 29 (79% yield), it did not react with the ester enolate 30 by Claisen condensation/transesterification (Scheme 5). (Chemical Equation Presented)
    • We could not extend our approach to a synthesis of pulvinic acids 32 and 33. While dioxolanone 31 was accessible by a Horner-Wadsworth-Emmons reaction between phosphonate 24b and α-oxo ester 29 (79% yield), it did not react with the ester enolate 30 by Claisen condensation/transesterification (Scheme 5). (Chemical Equation Presented)


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