Synthesis of (6R,11S)- and (6R,11R)-5,10-methylene[11-1H,2H]tetrahydrofolate. Stereochemical paths of serine hydroxymethyltransferase, 5,10-methylenetetrahydrofolate dehydrogenase, and thymidylate synthetase catalysis
作者:Lawrence J. Slieker、Stephen J. Benkovic
DOI:10.1021/ja00318a049
日期:1984.3
Steric course of ketopantoate hydroxymethyltransferase in E. coli
作者:D. John Aberhart、David J. Russell
DOI:10.1021/ja00329a045
日期:1984.8
Versatile Synthon for Chirally<i>β</i>-Deuterated<scp>L</scp>-Amino Acids and Synthesis of (3<i>R</i>)- and (3<i>S</i>)-[3–<sup>2</sup>H<sub>1</sub>-<scp>l</scp>-Serine*
A divergent and highly enantioselective synthetic methodology for producing chirally β-deuterated l-amino acids was developed. This method is based upon the chirality transcription approach, using diacetone-d-glucos-3-ulose (1) as a template. 3-C-[2–2H1]-Ethenyl-3-O-(N-benzyl)methylthioformimidoyl-d-allo-derivatives (3b and 3c), which are easily accessible from 1, were subjected to halonium ion-assisted cyclization to afford highly diastereoselectively and efficiently versatile 5-membered cyclic carbamate synthons having a stereochemically defined deuterated halomethyl group (4c and 4d, respectively). Subsequent straightforward transformation of these synthons gave rise to (3R)- and (3S)-[3–2H1]-l-serine. Further transformation of the crucial halomethyl group of 4a–c was also pursued to extend this methodology.