Synthesis of α-amino acids by reaction of aziridine-2-carboxylic acids with carbon nucleophiles
作者:Kenneth J. M. Beresford、Nicola J. Church、Douglas W. Young
DOI:10.1039/b605026n
日期:——
homochiral alpha-amino acids have been prepared in good yield via regioselective reaction of higher order cuprates with (2S)-N-para-toluenesulfonylaziridine-2-carboxylic acid 4. The reaction was much less regioselective and low yielding when higher order cuprates were reacted with the more hindered aziridine carboxylic acid 30, the principal products being protected beta-amino acids. Reaction of lithium tr
Synthesis of α-amino acids by ring opening of aziridine-2-carboxylates with carbon nucleophiles
作者:Nicola J Church、Douglas W Young
DOI:10.1016/0040-4039(94)02198-k
日期:1995.1
Excellent regiospecificity has been achieved in the reaction of carbon nucleophiles with N-para-toluenesulfonylaziridine-2-carboxylic acid (6, R = H protected as the anion. This has been developed into a general and high yielding synthesis of optically pure α-amino acids containing one chiral centre. When the aziridine (20) containing a second chiral centre was used, only lithium trimethylsilylacetylide
Synthesis of the suicide substrate D-propargylglycine stereospecifically labelled with deuterium and investigation of its oxidation by D-amino acid oxidase 1
作者:Nicola J. Church、Douglas W. Young
DOI:10.1039/a800579f
日期:——
Stereospecifically deuteriated samples of D-propargylglycine 1 have been prepared by reaction of the labelled Pmc-protected aziridine free acids 22 with a lithium acetylide followed by deprotection. These samples have been used to show that D-amino acid oxidase, in converting D-propargylglycine to the lactone 5, deprotonates C-3 in a non-stereospecific manner. This strongly supports the idea that non-enzymic deprotonation is a key step in the formation of this compound.