Scheme 1.
Synthesis of C10-modified TX-67 analogs. Reagents and conditions: (a) succinic anhydride, DMAP, toluene 85 °C; (b) glutaric anhydride, DMAP, toluene 85 °C; (c) CH2N2, THF; (d) NH4HCO3, THF, BOC2O, pyridine; (e) NH2Me HCl, EDCI, NMM, CH2Cl2; (f) NHMe2 HCl, EDCI, NMM, CH2Cl2; (g) HF-pyridine, pyridine.