Synthesis of (2S,3R)[3-2H1]- and (2S,3S)[2,3-2H2]-serines and (1R)[1-2H1]- and (1S,2RS)[1,2-2H2]-2-aminoethanols
作者:David Gani、Douglas W. Young
DOI:10.1039/c39820000867
日期:——
(2S,3R)[3-2H1]-and (2S,3S)[2,3-2H2]-serines have been prepared by a route which includes a Baeyer–Villiger oxidation involving rearrangement of a secondary chiral centre; a 1H n.m.r. assay has been developed to assess stereochemical integrity of both prochiral centres in 2-aminoethanol and this shows that decarboxylation of each sample of serine proceeds without loss of chirality at C-3, yielding (1R)[1-2H1]-and
Tartrate dehydrogenase reductive decarboxylation: stereochemical generation of diastereotopically deuterated hydroxymethylenes
作者:Mark W. Ruszczycky、Vernon E. Anderson
DOI:10.1016/j.bioorg.2003.09.006
日期:2004.2
Concomitant with the ketonization of the intermediate enolate the C3 hydroxymethylene of glycerate necessarily acquires a proton from solvent. In D2O, the proton is shown to be added stereospecifically to form (2R,3R)-[3-2H]glycerate. The 1H-NMR assignments of the diastereotopic C3 protons of glycerate were confirmed by the enzymatic conversion of [1R-2H]fructose-6-phosphate to (2R,3R)-[3-2H]glycerate
The synthesis of L-serine and L-cystine stereospecifically labeled with deuterium at the beta-position is described. The carboxyl group of D-serine was transformed into chirally deuterium-labeled alcohol via asymmetric reduction of 1-deuterio aldehyde, while the original hydroxymethyl group was converted into a carboxyl functionality to afford (2S, 3R)-[3-H-2]serine. Functional group interconversions of the hydroxyl group in the obtained deuterium-labeled L-serine gave (2R, 2'R, 3S, 3'S)-[3, 3'-H-2(2)]cystine. (c) 2006 Elsevier Ltd. All rights reserved.