Synthesis of N-Urethane Protected α-Aminoalkyl-α′-cyanomethyl Ketones; Application to the Synthesis of 3-Substituted 5-Amino-1H-pyrazole Tethered Peptidomimetics
摘要:
The preparation of N-protected amino/peptide alpha-cyanomethyl ketones through cyanation of the corresponding alpha-bromomethyl ketones is described. The utility of the resulting acyanomethyl ketones in the synthesis of 3-substituted-5-amino-1H-pyrazoles has also been demonstrated. In both steps a wide range of N-protected amino/peptide acids has been employed and the products are obtained in good yield. The enantiomeric purity of both the alpha-cyanomethyl ketones and pyrazoles were confirmed by chiral HPLC analysis of the corresponding Z-protected D-and L-Ala-OH as model substrates. The synthesis of peptide pyrazolecarbox-amides is also delineated.
Phenylhydrazide as an Enzyme-Labile Protecting Group in Peptide Synthesis
作者:Martin Völkert、Surrinder Koul、Gernot H. Müller、Manfred Lehnig、Herbert Waldmann
DOI:10.1021/jo0259966
日期:2002.10.1
The enzymatic cleavage of amino acid phenylhydrazides with the enzyme tyrosinase (EC 1.14.18.1) offers a new, mild, and selective method for C-terminal deprotection of peptides. The advantages of the described methodology are the very mild oxidative removal of the protecting group at room temperature and pH 7, a high chemo- and regioselectivity, and the availability of the biocatalyst. Even in oxygen-saturated
The phenyl hydrazide as an enzyme-labile protecting group — Oxidative cleavage with mushroom tyrosinase
作者:Gernot H Müller、Herbert Waldmann
DOI:10.1016/s0040-4039(99)00549-3
日期:1999.4
Amino acid and peptide phenyl hydrazides are selectively cleaved by oxidation to acyl diazenes with mushroom tyrosinase and their subsequent hydrolysis.
Potent dipeptidylketone inhibitors of the cysteine protease cathepsin K
作者:R Marquis
DOI:10.1016/s0968-0896(99)00011-5
日期:1999.4
aldehydes have been shown to be potentinhibitors of cathepsinK. In an effort to design more selective and metabolically stable inhibitors of cathepsinK, a series of electronically attenuated alkoxymethylketones and thiomethylketones inhibitors have been synthesized. The X-ray co-crystal structure of one of these analogues in complex with cathepsinK shows the inhibitor binding in the primed side of