Acide 2-fluoro-2-phényl acétique. Partie 5 [1]. RMN du fluor de ses amides formés avec des hydroxy amines et des fluoro amines
摘要:
The fluorine chemical shifts (deltaF) of the PhCHFCONHCHR1CH(Z)R2 (Z = OH and F) amides of the PhCHFCO2H and hydroxyamines or fluoroamines have been studied. The absolute configuration of the R1CH(NH2)CHFR2 fluoroamines may be deduced from a comparison of the deltaF values of amides from hydroxyamines of known configuration with the deltaF values of amides from analogous fluoroamines.
Optically pure amines were synthesized effectively by Lewis acid-catalyzed triethylsilane reduction of N-acyl-α-methoxyalkylamines which were readily obtained by anodic oxidation of N-acyl-α-amino acids. This method was also applied to the conversion of an N-acylpeptide into the corresponding optically pure amine derivative.
Van Delft, Floris L.; Timmers, Cornelis M.; Van Der Marel, Gijs A., Synthesis, 1997, # 4, p. 450 - 454
作者:Van Delft, Floris L.、Timmers, Cornelis M.、Van Der Marel, Gijs A.、Van Boom, Jacques H.
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Rapid Conventional and Microwave-Assisted Decarboxylation of L-Histidine and Other Amino Acids via Organocatalysis with R-Carvone Under Superheated Conditions
作者:Douglas M. Jackson、Robert L. Ashley、Callan B. Brownfield、Daniel R. Morrison、Richard W. Morrison
DOI:10.1080/00397911.2015.1100745
日期:2015.12.2
This article reports a new methodology taking advantage of superheated chemistry via either microwave or conventional heating for the facile decarboxylation of alpha amino acids using the recoverable organocatalyst, R-carvone. The decarboxylation of amino acids is an important synthetic route to biologically active amines, and traditional methods of amino acid decarboxylation are time consuming (taking up to several days in the case of L-histidine), are narrow in scope, and make use of toxic catalysts. Decarboxylations of amino acids including L-histidine occur in just minutes while replacing toxic catalysts with green catalyst, spearmint oil. Yields are comparable to or exceed previous methods and purification of product ammonium chloride salts is aided by an isomerization reaction of residual catalyst to phenolic carvacrol. The method has been shown to be effective for the decarboxylations of a range of natural, synthetic, and protected amino acids.
US2014/275569
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Levene; Haller, Journal of Biological Chemistry, 1925, vol. 65, p. 53