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Synthesis scheme of heptavalent anthrax toxin inhibitor. (a) TBDMSCl, pyridine, 0 °C - rt. (b) NaH, MeI, THF (c) NH4F, MeOH, reflux (d) NaH, propargyl bromide, DMF, 0 °C - rt. (e) CuSO4, sodium ascorbate, THF:H2O:BuOH (0.5:1:1), 80 °C (f) Chloroacetic anhydride, triethylamine (g) Peptide, DMF, DBU, triethylamine.
