Preparations of benzyloxycarbonyl-γ-t-butyl-L-glutamyl-N(ε)-t-butoxycarbonyl-L-lysyl-L-alanyl-γ-t-butyl-L-glutamyl-L-alanylglycine and of benzyloxycarbonyl-γ-t-butyl-L-glutamyl-N(ε)-t-butoxycarbonyl-L-lysyl-L-alanyl-γ-t-butyl-L-glutamyl-O-t-butyl-L-serylglycine by stepwise active ester procedures are described.
R. D. Cowell and J. H. Jones, J. Chem. Soc., Perkin Trans. 1, 1972, 1809 DOI: 10.1039/P19720001809
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