نتایج جستجو برای: aromatic acids
تعداد نتایج: 301867 فیلتر نتایج به سال:
in an endeavor to find a novel series of antihyperglycemic agents, new benzimidazole and pyrimidine derivatives were successfully synthesized efficiently in high yield with high purity, starting from amino acids in the presence of phosphorus oxychloride (pocl3). the synthesized compounds were identified by 1h-nmr, 13c-nmr, ft-ir spectroscopic techniques and elemental analysis. all products were...
Pd-catalysed decarboxylative Suzuki reactions and orthogonal Cu-based O-arylation reactions of aromatic carboxylic acids are reported. The new reactions may provide alternative routes for the synthesis of some biaryls and aromatic carboxylic esters.
Phenylalanine, tyrosine, and tryptophan were taken up into cells of Escherichia coli K-12 by a general aromatic transport system. Apparent Michaelis constants for the three amino acids were 4.7 x 10(-7), 5.7 x 10(-7), and 4.0 x 10(-7)m, respectively. High concentrations (> 0.1 mm) of histidine, leucine, methionine, alanine, cysteine, and aspartic acid also had an affinity for this system. Mutan...
This communication describes the development of conformationally constrained unnatural aromatic amino acids, constructed on rigid backbone wherein the carboxyl and amino groups project in two dimensions (planes) on the aromatic framework. Such a feature offers the possibility of design and development of conformationally ordered synthetic oligomers with intriguing structural architectures disti...
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