This paper describes the synthesis of two diastereoisomers of an imidazolin
e dipeptide mimetic (a 4,5-dihydroimidazole-4-carboxylic acid). suitably pr
otected for incorporation into solid phase peptide synthesis (SPPS) using t
he Fmoc protocol, from a phenylalanine-derived thioimidate and an alpha,bet
a -diaminopropanoic acid ester, followed by protecting group manipulation.
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