Trifluoromethanesulfonic anhydride → Methyl {3-(4-chlorophenyl)-5-oxo-4-[(1E)-3,3,3-trifluoroprop-1-en-1-yl]-4,5-dihydro-1H-1,2,4-triazol-1-yl}acetate

Participants

Reaction Steps

280 mg (0.74 mmol) of the compound from Example 7A were introduced at RT together with 108.1 mg (0.89 mmol) of 4-dimethylaminopyridine in 5.3 ml of pyridine, admixed with portions of 0.31 ml (1.84 mmol) of trifluoromethanesulphonic anhydride and stirred for 12 h. The pyridine was removed on a rotary evaporator and the residue was taken up in acetonitrile and 1N hydrochloric acid. The product was purified by preparative HPLC (Method 10). This gave 230 mg (86% of theory) of the title compound.

Provenance & Evidence