A Simple and Rapid Protocol for<i>N</i>-Methyl-<i>α</i>-Amino Acids
作者:G. Vidyasagar Reddy、D.S. Iyengar
DOI:10.1246/cl.1999.299
日期:1999.4
A two step strategy for optically pure N-Protected-N-methyl-α-amino acids starting from N-protected-α-amino acids via reductive cleavage of oxazolidinones using NaCNBH3/TMSCl is described.
Mild regeneration of the carboxylic group of amino acid alkyl esters by aqueous methanolic sodium hydrogen carbonate via 5-oxazolidinones
作者:Pietro Allevi、Mario Anastasia
DOI:10.1016/j.tetlet.2003.08.028
日期:2003.10
A simple racemization-free procedure allows the regeneration of the carboxylic acid group of aminoacid alkyl esters by way of an intermediate 5-oxazolidinone which is hydrolyzed by treatment with sodium hydrogen carbonate in aqueous methanol.
Stanna-Brook Rearrangement of Carboxylic Acid Derivatives. Synthetic Utility and Mechanistic Studies
作者:M. Rita Paleo、M. Isabel Calaza、Paula Graña、F. Javier Sardina
DOI:10.1021/ol049826m
日期:2004.3.1
[reaction: see text] The reaction of R(3)SnLi with carboxylic acid derivatives proceeds through a novel, very fast stanna-Brook rearrangement that generates alpha-alkoxyorganolithium compounds as intermediates. The outcome of these reactions depends on the nature of the carboxyl derivatives. Reaction of R(3)SnLi with ester derivatives gives rise to coupled products through a novel C-C bond formation