Synthesis of15N-Labelled D-Isovaline and α-Aminoisobutyric Acid
摘要:
[N-15]-D-isovaline was prepared from DL-[alpha-N-15]-alpha-aminoisovaleramide by enzymatic resolution with Mycobacterium neoaurum. The N-15-isotope was introduced during the Strecker synthesis of its precursor, e.g. aminoisovaleronitrile. Attempts to prepare the amino nitrile precursor of [N-15]-alpha-aminoisobutyric acid (Aib) led to a poor yield and loss of the label. Significantly, improved results were obtained when a cosolvent is present during formation of aminoisobutyronitrile.
[N-15]-D-isovaline was prepared from DL-[alpha-N-15]-alpha-aminoisovaleramide by enzymatic resolution with Mycobacterium neoaurum. The N-15-isotope was introduced during the Strecker synthesis of its precursor, e.g. aminoisovaleronitrile. Attempts to prepare the amino nitrile precursor of [N-15]-alpha-aminoisobutyric acid (Aib) led to a poor yield and loss of the label. Significantly, improved results were obtained when a cosolvent is present during formation of aminoisobutyronitrile.
Orgel'; Rimavi; Shvets, Russian Journal of Organic Chemistry, 2000, vol. 36, # 8, p. 1225 - 1226
作者:Orgel'、Rimavi、Shvets、Raap
DOI:——
日期:——
——
作者:A. Ogrel'、V. Rimavi、J. Raap、V. Shvets
DOI:10.1023/a:1012417532363
日期:——
Approach was developed to a preparative synthesis of isotope-labeled aminoacids contained in servamycin IIB antibiotic. Glutamines labeled with N-15, C-13, and H-2 were prepared in 70-80% yield starting with the corresponding labeled glutamic. acids under catalysis with the glutamine synthetase enzyme. N-15-2-aminoisobutanoic acid and N-15-isovaline were obtained by Strecker method in 65 and 31% yields respectively. All compounds synthesized were identified and characterized by NMR spectroscopy.