Biosynthesis of the antitumor antibiotic sparsomycin
作者:Ronald J. Parry、Yan Li、Elizabeth Eudy Gomez
DOI:10.1021/ja00041a007
日期:1992.7
The biosynthesis of the antitumor antibiotic sparsomycin (1) has been investigated by administration of isotopically labeled precursors to Streptomyces sparsogenes var. sparsogenes. These studies indicated that the dithioacetal moiety (2) of sparsomycin is derived from L-cysteine via the intermediacy of 5-methylcysteine and S-(methylthiomethyl)cysteine, with reduction of the carboxyl group of 5-(m
Syntheses of Metabolites ofS-Carboxymethyl-L-cysteine andS-Methyl-L-cysteine and of Some Isotopically Labelled (2H,13C) Analogues
作者:Claus O. Meese、Dagmar Specht、Ute Hofmann
DOI:10.1002/ardp.19903231205
日期:——
The chemical syntheses of human metabolites of S‐carboxymethyl‐L‐cysteine (3) and S‐methyl‐L‐cysteine (12) are described. The additional preparation of some 2H‐ and 13C‐labelled isotopomers enabled the direct evaluation of the stabilities of 3 and 12 under physiological conditions and also facilitated the unambiguous assignments of the signals in the 13C‐NMR spectra of all compounds mentioned.
Cobalt assisted cleavage of SS bonds and a base-free synthesis of mercapturic acids
作者:Shantanu Chowdhury、Sujit Roy
DOI:10.1016/s0040-4039(97)00268-2
日期:1997.3
Base free transformation of PhSSPh to sulfides, PhSR (R= alkyl, benzyl, allyl, acyl) and N-acetyl-L-cystine to mercapturic acids [AcNHCH(COOH)CH2SR, R= alkyl, benzyl, allyl, acyl] have been achieved using Zn/cat. CoCl2/organic halide in MeCN at room temperature.
Carvacrol Codrugs: A New Approach in the Antimicrobial Plan
作者:Ivana Cacciatore、Mara Di Giulio、Erika Fornasari、Antonio Di Stefano、Laura Serafina Cerasa、Lisa Marinelli、Hasan Turkez、Emanuela Di Campli、Soraya Di Bartolomeo、Iole Robuffo、Luigina Cellini
DOI:10.1371/journal.pone.0120937
日期:——
bacterial infections led to identify alternative strategies for a novel therapeutic approach. In this study, we synthesized ten carvacrol codrugs - obtained linking the carvacrol hydroxyl group to the carboxyl moiety of sulphur-containing amino acids via an ester bond - to develop novel compounds with improved antimicrobial and antibiofilm activities and reduced toxicity respect to carvacrol alone. METHOD All
N-acetylcysteine (NAC) derivatives were synthesized and screened for anti-hepatocellular injury activities against two different cell models in which the derivatives 6a and 6b displayed most potent with decreasing malondialdehyde (MDA) level.