Synthesis of ?-aminoacyl derivatives of melphalan for use in antibody directed enzyme pro-drug therapy
作者:Dale W. Larden、H.T. Andrew Cheung
DOI:10.1016/s0040-4020(98)01139-9
日期:1999.3
L-Alanyl-, D-alanyl-, L-prolyl-, L-pyroglutamyl- and D-phenylalanylmelphalan were synthesized in 8 steps, with the reactive nitrogen mustard moiety formed at the penultimate step. After protection of p-nitrophenylalanine with benzyl ester and N-t-butyloxycarbonyl (BOC) groups, the aromatic nitro was reduced to an amine which was reacted with ethylene oxide to give a product with a bis(2-hydroxyethyl)amino moiety. After removal of BOC, it was coupled to the relevant N-benzyloxycarbonyl-alpha-amino acid. Chlorination of hydroxyethyl yielded the bis(2-chlorethyl)amino compound. Final removal of protecting groups was by catalytic hydrogenolysis. (C) 1999 Elsevier Science Ltd. All rights reserved.