An efficient and highly selective deprotection of N‐Fmoc‐α‐amino acid and lipophilic N‐Fmoc‐dipeptide methyl esters with aluminium trichloride and N,N‐dimethylaniline
2004
: A novel procedure for the deprotection of the carboxyl group of amino acid methyl esters is presented. The process is carried out by the reagent system aluminium trichloride/N,N-dimethylaniline that can successfully be applied to unblock the carboxyl moiety either of N-Fmoc-protected amino acid methyl esters and N-Fmoc-protected short dipeptide methyl esters. The chiralities of the optically pure amino acid or peptide precursors are maintained totally unchanged.
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