Configurationally stable 5-aza[6]helicene (1) was envisaged as a promising scaffold for non-conventional ionic liquids (IL)s. It was prepared, purified, and separated into enantiomers by preparative HPLC on a chiral stationary phase. Enantiomerically pure quaternary salts of 1 with appropriate counterions
Journal of Asian natural products research, 13(3), 225-229 (2011-03-17)
Two new compounds, N-[4'-hydroxy-(E)-cinnamoyl]-l-tyrosine methyl ester (1) and methyl 4-methoxy-3-(3'-hydroxy-2'-methyl)propionyloxy-benzoate (2), were isolated from EtOAc extract of the fermentation broth of the endophytic fungus Aspergillus sp. HS-05. Their structures were elucidated by NMR, IR, UV, MS, and CD methods. Compounds
Photochemistry and photobiology, 68(4), 453-458 (1998-10-31)
This paper studies the dye-sensitized photooxidation of tyrosine (tyr) and tyr di- and tripeptides (tyr-tyr and tyr-tyr-tyr) mediated by singlet molecular oxygen (O2[1 delta g]) in alkaline media. Photooxidation quantum efficiencies (phi r) were obtained by determining the overall and
Molecular and cellular endocrinology, 93(1), 81-86 (1993-05-01)
Various protease inhibitors (e.g. phenylmethanesulfonyl fluoride (PMSF), tosyl-phenylalanine chloromethyl ketone (TosPheCH2Cl)) and substrates (e.g., tosyl-arginine methyl ester (TosArgOMe), tryptophan methyl ester (TrpOMe)) inhibit the binding of adrenal and sex steroids to their cognate receptors (Hubbard and Kalimi (1985) Mol. Cell.
Molecular and cellular biochemistry, 364(1-2), 253-261 (2012-02-09)
Tyrosine levels are abnormally elevated in tissues and physiological fluids of patients with inborn errors of tyrosine catabolism, especially in tyrosinemia type II, which is caused by deficiency of tyrosine aminotransferase and provokes eyes, skin, and central nervous system disturbances.
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