NSC677645 → HCID 14987866, compound

Participants

Reaction Steps

50 g (78.76 mmol) of 4,7,10-tris(p-toluenesulfonyl)-1,4,7,10-tetraazacyclododecane and 13.63 g (94.51 mmol) of 4,4-dimethyl-3,5,8-trioxabicyclo-[5.1.0]-octane are dissolved in 300 ml of dimethylformamide and heated in an autoclave for 24 hours to 170° C. It is evaporated to dryness and the residue is chromatographed on silica gel (mobile solvent: methylene chloride/hexane/acetone: 10/5/1). The main fractions are concentrated by evaporation and recrystallized from methyl tert-butyl ether/methanol. Yield: 52.76 g (86% of theory) of a cream-colored powder.

Provenance & Evidence