Abstract
We report recent developments in the optimization of a submonomer synthesis of peptide nucleic acid based on the Fukuyama-Mitsunobu reaction. The key steps in the submonomer synthesis are the installation of an appropriately protected 2-aminoethyl group on the α-nitrogen of an amino acid and its subsequent acylation with a protected nucleobase derivative. The aggressive alkylation conditions require a scheme of maximal protection for the nucleobases and that is proposed herein for the pyrimidines.
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