alpha-Trialkylsilyl amino acids have been evaluated for their stability toward methanolysis as a model for physiological conditions. The juxtaposition of amine and carbonyl groups significantly destabilizes the silicon-carbon bond, but changing a single methyl on silicon to an ethyl led to a dramatic stability enhancement. Converting the ester to an amide gave an additional jump in stability, suggesting broad potential for these novel amino acids in bioactive peptides and pharmaceuticals.
Enantioselective α-Silyl Amino Acid Synthesis by Reverse-Aza-Brook Rearrangement
作者:Guodong Liu、Scott McN. Sieburth
DOI:10.1021/ol0358713
日期:2003.11.1
Asymmetric reverse-aza-Brook rearrangement of N-Boc-N-trialkylsilyl allylamine yields an enantiomerically enriched alpha-amino allylsilane. Oxidative cleavage of the alkene leads to a Boc-protected amino acid with the configuration of naturally occurring amino acids (L). Standard coupling protocols, including the use of trifluoroacetic acid for removal of the Boc group, yield a tripeptide with a central silane amino acid.