Asymmetric hydrogenation ofN-acetyldehydrodipeptide complexes with Mg(II) and Ca(II) ions
作者:I. N. Lisichkina、A. I. Vinogradova、N. B. Sukhorukova、E. V. Tselyapina、M. B. Saporovskaya、V. M. Belikov
DOI:10.1007/bf00698456
日期:1993.3
N-Ac-DELTA-Phe-AA form labile complexes with Mg(II) ions. Potentiometric titration data show that the carboxyl group of the dehydrodipeptide in them scarcely participates in complexation, unlike the complexes with Ca(II) ions, The hydrogenation of these complexes over Pd/C occurs asymmetrically, the diastereomeric excess being as high as 58%.
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作者:I. N. Lisichkina、A. G. Ivanova、A. S. Peregudov、V. M. Belikov
DOI:10.1023/a:1011397803696
日期:——
The peptide protons in N-acetyl -alpha,beta -dehydrodipeptides (DHDP) dissociate in aqueous methanol in the presence of magnesium salts upon the addition of alkali, which favors the diastereoselectivities of their hydrogenation over Pd/C. By contrast, the N-H bonds of the N-acetyl groups in DHDP seem not to dissociate under these conditions. The dissociation of the peptide N-H bonds in strongly alkaline solutions was studied by F-19 NMR spectroscopy for model compounds containing the 4-FC6H4 fragment.
Behrens; Doherty; Bergmann, Journal of Biological Chemistry, 1940, vol. 136, p. 61,64
作者:Behrens、Doherty、Bergmann
DOI:——
日期:——
Asymmetric homogeneous reduction of dehydropeptides