反应详情

Equation 2 shows the synthetic steps involved in the construction of the required N-[p methyl-aminobenzoyl]-glutamyl-γ-4-fluoroglutamic acid (12). The free acid 7 was obtained by treatment with Dowex 50WX8 in 60% EtOH/H2O. Coupling of the α, γ-carboxyl protected D,L-erythro, threo-4-fluoroglutamate ester to 8 was accomplished using DCC/HOBt giving the pipeptide 9 in 90% yield, hydrogenation of 9 in MeOH using 10% Pd on carbon catalyst gave the free amine 10 in quantitative yield.