Fig. 1.
Schematic representation of the synthesis of MON analogs. Reactions and conditions: (a) MON-Na (1 eq.), DMAP (catalytic amount), acyl chloride (3 eq.), pyridine, rt, 48 h; (b) MON-H (1 eq.), respective isocyanate (0.95 eq.), anhydrous toluene, rt, 14 days.