We present herein a straightforward synthesis of N-Fmoc-protected synthons derived from a phosphinic analogue of methionine. These precursors were used Successfully for the solid-phase synthesis of methionine-mimic phosphinopeptides using BOP-catalyzed coupling without protection of the phosphoryl moiety. We also prepared a new type of pseudopeptide derived from a phosphinic analogue of norleucine with a -PO(OH)-CH(2)-COOR moiety. (C) 2008 Elsevier Ltd. All rights reserved.
Synthesis of α-carboxyphosphinopeptides derived from norleucine
investigated, compared and improved two different synthetic methods described in literature: the Arbuzov reaction of a silylated N-protected phosphinicacid with a bromoacetate ester and the nucleophilic addition of a mixed O-methyl S-phenyl N-protected phosphonic acid or a methyl N-protected phosphonochloridate with tert-butyl lithioacetate. We also prepared two N-Fmoc protected synthons, Fmoc-Nle-Ψ[PO(OH)]-Gly-COOH