Enantioselective Syntheses of α-Fmoc-Pbf-[2-13C]-l-arginine and Fmoc-[1,3-13C2]-l-proline and Incorporation into the Neurotensin Receptor 1 Ligand, NT8−13
摘要:
Enantioselective syntheses of selectively labeled, orthogonally protected [2-C-13]L-arginine and [1,3-C-13(2)]-L-proline are described from the commercially available precursors [2-C-13]bromoacetic acid and potassium [C-13]cyanide, Interestingly the enhanced signal assigned to C-2 in the C-13 NMR spectrum of alpha-Fmoc-Pbf-[2-C-13]-L-arginine was very broad at room temperature. The two Fmoc-labeled amino acids were used to prepare [2-C-13]-Arg9 and [1,3-C-13(2)]-Pro 10 labeled ligand (NT8-13) by manual Fmoc-SPSS.
Enantioselective Syntheses of α-Fmoc-Pbf-[2-<sup>13</sup>C]-<scp>l</scp>-arginine and Fmoc-[1,3-<sup>13</sup>C<sub>2</sub>]-<scp>l</scp>-proline and Incorporation into the Neurotensin Receptor 1 Ligand, NT<sub>8−13</sub>
作者:Chuanjun Song、Satita Tapaneeyakorn、Annabel C. Murphy、Craig Butts、Anthony Watts、Christine L. Willis
DOI:10.1021/jo9014497
日期:2009.12.4
Enantioselective syntheses of selectively labeled, orthogonally protected [2-C-13]L-arginine and [1,3-C-13(2)]-L-proline are described from the commercially available precursors [2-C-13]bromoacetic acid and potassium [C-13]cyanide, Interestingly the enhanced signal assigned to C-2 in the C-13 NMR spectrum of alpha-Fmoc-Pbf-[2-C-13]-L-arginine was very broad at room temperature. The two Fmoc-labeled amino acids were used to prepare [2-C-13]-Arg9 and [1,3-C-13(2)]-Pro 10 labeled ligand (NT8-13) by manual Fmoc-SPSS.