Synthesis of Boc-Amino Tetrazoles Derived from α-Amino Acids
作者:Vommina V. Sureshbabu、Shankar A. Naik、G. Nagendra
DOI:10.1080/00397910802374133
日期:2009.1.13
Abstract A simple route for the synthesis of Boc-protected tetrazoleanalogs of amino acids starting from N α-Boc amino acids has been described. The [2 + 3] cycloaddition of Boc-α-amino nitrile and sodium azide in the presence of a catalytic amount of zinc bromide yielded the desired tetrazoles in good yields and purity. All the compounds obtained have been characterized by 1H and 13C-NMR and mass
Constrained cyclic β,γ‐diamino acids were synthesized starting from l‐glutamic acid. The key steps were a Blaise reaction and a reduction that gave access to both diastereomers. Changing the protecting group can lead to either the five‐membered‐ring lactam, which can be used as a β‐amino acid, or to the six‐membered‐ring lactam, as a γ‐amino acid.
Use of ‘Click Chemistry’ for
the Synthesis of Tetrazole-Containing Analogues of the Neuroprotective
Agent Glycyl-<scp>l</scp>-prolyl-<scp>l</scp>-glutamic
Acid
作者:Margaret Brimble、Kuo-yuan Hung、Paul Harris
DOI:10.1055/s-0028-1088128
日期:——
Tetrazole-containing analogues of glycyl-l-prolyl-l-glutamic acid (GPE) were prepared by coupling of Cbz-glycyl-l-proline with tetrazole-containing glutamic acids followed by hydrogenation of the resultant tripeptide. Synthesis of the tetrazole-containing glutamic acids involved 1,3-dipolar cycloaddition of sodium azide to nitrile derivatives of the corresponding glutamic acids.