Synthesis of (R)- and (S)-2,3-diaminopropyl sulfate: mechanism based inhibition of glutamate 1-semialdehyde aminomutase
摘要:
A short synthesis of each enantiomer of 2,3-diaminopropyl hydrogensulfate is described starting from (2R)- and (2S)-asparagine. The compounds serve as inhibitors for pyridoxal 5'-phosphate-dependent (2S)-glutamate l-semialdehyde aminotransferase, a target for selective herbicides and antibacterial agents on the tetrapyrrole biosynthetic pathway. The (2R)-enantiomer, as predicted, serves as a potent irreversible inactivator. (C) 2000 Elsevier Science Ltd. All rights reserved.
Halogeno, sulfato, and nitrato Pt (II) complexes of 2, 3-diaminopropanol (pnOH) isomers were synthesized and their antitumor activities against leukemia L1210 were tested. The conformations of their chelate rings were determined to be λ-and δ-gauche forms for R- and S-pnOH, respectively, by 13C-nuclear magnetic resonance and circular dichroism spectral analyses. Among the pnOH isomers, Pt (II) complexes containing R-pnOH showed higher antitumor activity than those containing S- or racemic pnOH. It seems that there may be a relationship between the conformations of the chelate rings and antitumor activity in the case of five-membered chelate rings.
A template-directed synthetic approach to halogen-bridged mixed-valence platinum complexes has been performed in organic media using, for instance, a syntheticpeptide bearing two bis(ethylenediamine)-based Pt(IV) complexes with two axial bromide anionic ligands, [(Pt(IV)Br2(en))2](RSO3)4, and a [Pt(II)(en)2](RSO3)2 complex (R = (C12H25OCH2)2CHO(CH2)3-).
A short synthesis of each enantiomer of 2,3-diaminopropyl hydrogensulfate is described starting from (2R)- and (2S)-asparagine. The compounds serve as inhibitors for pyridoxal 5'-phosphate-dependent (2S)-glutamate l-semialdehyde aminotransferase, a target for selective herbicides and antibacterial agents on the tetrapyrrole biosynthetic pathway. The (2R)-enantiomer, as predicted, serves as a potent irreversible inactivator. (C) 2000 Elsevier Science Ltd. All rights reserved.