Syntheses of isotopically labelled L-α-amino acids with an asymmetric centre at C-3
作者:John R. Harding、Rachael A. Hughes、Nicholas M. Kelly、Andrew Sutherland、Christine L. Wilis
DOI:10.1039/b005172l
日期:——
Approaches are described to the synthesis of a series of isotopicallylabelled L-α-amino acids each with an asymmetric centre at C-3, including isoleucine, allo-isoleucine, threonine and allo-threonine. The methods may be simply adapted for the selective incorporation of an isotopiclabel at each site of L-valine including the selective labelling of either diastereotopic methyl group with carbon-13
Enantioselective syntheses of α-amino-β-hydroxy acids, and [15N]-L-threonine
作者:Andrew Sutherland、Christine L. Willis
DOI:10.1016/s0040-4039(97)00164-0
日期:1997.3
The enantioselective synthesis of from ethyl (S)-lactatevia methyl (S)-3-methoxymethoxy-2-oxobutanoate15 is described. The stereogenic centre at C-2 was established by a one-pot, dual enzyme catalysed hydrolysis of the ester (by a lipase) and reductiveamination of the ketone of 15 (with leucine dehydrogenase) to give, after deprotection, acid as a single diastereomer in 93% yield. [15N]-L-Threonine