The fourteen-membered ring cyclotetrapeptides cyclo-(β-alanylglycyl-β-D-aspartylglycyl) methyl ester and cyclo-[β-alanylglycyl-L-(α-amino)-β-alanylglycyl] have been synthesised through the cyclisation of the corresponding linear tetrapeptides with o-phenylene chlorophosphite.
C. H. Hassall, D. G. Sanger and B. K. Handa, J. Chem. Soc. C, 1971, 2814 DOI: 10.1039/J39710002814
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