Abstract
Starting from N α-benzyloxycarbonyl-L-tyrosine( O-triflate)benzyl ester, we have prepared enantiomerically pure 4-carboxyphenylalanine and 4-methoxycarbonylphenylalanine derivatives using palladium (0) catalyzed carbonylation reactions. These unnatural amino acids were suitably protected and were used in solid-phase peptide synthesis using the Fmoc/ t-butyl approach.
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