Aminolysis of carbamic esters, a model of the intermediate carboxybiotin in enzymatic carboxylations was studied in organic medium in the presence of a divalent cation. This study establishes electrostatic catalysis of aminolysis, the rate determining step of which is the collapse of the tetrahedral intermediate principally by carbon-nitrogen bond breacking. The results also account for the role of the divalent cation present in the carboxytransferase subunit of carboxylases.
Synthesis of Benzoxazolones from Nitroarenes or Aryl Halides
作者:Achim Porzelle、Michael D. Woodrow、Nicholas C. O. Tomkinson
DOI:10.1021/ol902885j
日期:2010.2.19
A simple and effective method for the preparation of benzoxazolones from nitroarenes or aryl halides is described. Partial reduction of a nitro group in the presence of a chloroformate followed by a microwave-assisted rearrangement/ring closure sequence provides a convenient and practical procedure to prepare this important pharmacophore. Rearrangement precursors were also accessed from aryl halides through transition-metal-catalyzed coupling.
Some aliphatic esters of benzoxazolin-2-one-3-carboxylic acid
作者:N. L. Poznanskaya、S. N. Ivanova、N. N. Mel'nikov、N. I. Shvetsov-Shilovskii
DOI:10.1007/bf00945358
日期:——
Amino acid tethered benzoxazolone as highly potent inhibitors of O-glycosylation
作者:Tanisqa Mall、Mousmee Sharma、Parteek Prasher
DOI:10.1007/s11696-024-03461-y
日期:——
inhibitors of GlcNAc-Ts have been reported based on benzoxazolone appended amino acids/esters which showed a competitiveinhibition of the enzyme with IC50 values in lower micromolar range. The compounds 1b–5b showed a better inhibition profile against GlcNAc-Ts as compared to 1a–5a as evidenced by the in vitro 96 well plate ELISA experiment and the in vitro cytotoxicity studies on the cancer cell lines