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Volume 43 (3)
Publication Year
1988[X]
1Author    T. Hashimoto, M. Tori, Y. Asakawa, E. WollenweberRequires cookie*
 Title    Synthesis of Two Allergenic Constituents of Propolis and Poplar Bud Excretion  
 Abstract    The prenyl ester and the phenylethyl ester of caffeic acid, formed in the bud excretion of poplar species, were shown recently to be the major contact allergens in bee-glue. An unambiguous synthesis of these compounds, based on the reaction of caffeic acid with l-bromo-3-methyl-2-butene and with ß-bromoethylbenzene, respectively, is reported. The synthetic products confirm the previously described structures of the natural products and allow further testing of their allergenic properties. 
  Reference    Z. Naturforsch. 43c, 470—472 (1988); received January 25 1988 
  Published    1988 
  Keywords    Propolis, Contact Allergens, Prenyl Caffeate, Phenylethyl Caffeate, Synthesis 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0470_n.pdf 
 Identifier    ZNC-1988-43c-0470_n 
 Volume    43 
2Author    Denis Barron, RagaiK. IbrahimRequires cookie*
 Title    Synthesis of Flavonoid Sulfates. II. The Use of Aryl Sulfatase in the Synthesis of Flavonol-3-sulfates  
 Abstract    The rates of aryl sulfatase hydrolysis of several 7-, 4'-and 3-sulfated flavonoids were compared and found to follow the order 7 or 4' >» 3. The complete resistance of the 3-sulfate ester to enzyme hydrolysis provided a unique and convenient method for the synthesis of a number of naturally occurring flavonol-3-sulfates from the corresponding higher sulfated analogs in quanti-tative yield. 
  Reference    Z. Naturforsch. 43c, 625—630 (1988); received February 23/May 17 1988 
  Published    1988 
  Keywords    Flavonol Sulfate Esters, Synthesis, 13 C NMR, FAB-MS, UV Spectra 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0625.pdf 
 Identifier    ZNC-1988-43c-0625 
 Volume    43 
3Author    Denis Barron, RagaiK. IbrahimRequires cookie*
 Title    Synthesis of Flavonoid Sulfates. III. Synthesis of 3',4'-ortho Disulfates Using Sulfur Trioxide-trimethylamine Complex, and of 3'-SuIfates Using Aryl Sulfatase  
 Abstract    A number of flavonoid 3',4'-disulfates were synthesized from the corresponding 4'-sulfate esters, using sulfur trioxide-trimethylamine complex. Desulfation of the sulfate esters using aryl sulfatase demonstrated that the rate of hydrolysis of the 3'-sulfate group was slower than either the 7-or 4' groups, thus allowing the specific synthesis of flavonol 3,3'-disulfates. The effects of ori/io-disulfation on the L1 C NMR spectra of flavonoids, and the regative FAB-MS spectra of di-and trisulfated flavonoids are discussed. 
  Reference    Z. Naturforsch. 43c, 631—635 (1988); received March 18 1988 
  Published    1988 
  Keywords    Flavonoid Sulfate Esters, Synthesis, 13 C NMR, FAB-MS, UV Spectra 
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 TEI-XML for    default:Reihe_C/43/ZNC-1988-43c-0631.pdf 
 Identifier    ZNC-1988-43c-0631 
 Volume    43 
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