5-Carboxamido-4-amino-3-isoxazolidone, an asparagine analog
作者:Charles H. Stammer、Masayuki Sato
DOI:10.1021/jm00205a026
日期:1978.7
trans-Aziridine-2,3-dicarboxylic ester was used to prepare the required beta-chlorohydroxamic acid used in the synthesis of the title compound. The trans configuration of the asparagine analogue was established by hydrogenolysis to erythro-beta-hydroxyasparagine amide. Neither the title compound nor the intermediate aziridinehydroxamic acid (8) showed significant activity against the L1210 and P-388 tumors. The title compound was inactive as an inhibitor of asparagine synthetase from Novikoff hepatoma and did not inhibit the growth of some 25 bacteria and fungi.
Resolution of Amino Acids. IX. Studies on the Preparation of β-Hydroxyasparagines and Configuration of Natural Hydroxyasparagine
作者:Hideo Okai、Nobuo Izumiya
DOI:10.1246/bcsj.42.3550
日期:1969.12
Crystalline threo-and erythro-β-hydroxy-l-asparagine were prepared via asymmetric hydrolysis of the corresponding hydroxy-l-aspartic acid diamide by leucine aminopeptidase. The isomers of hydroxy-l-asparagine obtained were compared with the natural hydroxyasparagine isolated from human urine with respect to optical rotation and chromatography. From the results it is concluded that the spacial configuration of the natural product is that of erythro-β-hydroxy-l-asparagine. Additional studies were also carried out to prepare threo- and erythro-β-hydroxy-Dl-asparagine from the corresponding hydroxy-Dl-aspartic acid diamide without the enzyme.