C(O[C:4](=[O:9])[C:5]([F:8])([F:7])[F:6])C.[NH2:10][CH2:11][CH2:12][NH:13][CH2:14][CH2:15][NH2:16]>O1CCCC1>[F:6][C:5]([F:8])([F:7])[C:4]([NH:10][CH2:11][CH2:12][NH:13][CH2:14][CH2:15][NH:16][C:4](=[O:9])[C:5]([F:6])([F:7])[F:8])=[O:9]113.3 g (790 mmol) of trifluoroacetic acid ethyl ester is instilled in a solution of 41.14 g (390 mmol) of 1,4,7-triazaheptane in 350 ml of tetrahydrofuran at 0° C. and under nitrogen. It is allowed to stir overnight at room temperature, concentrated by evaporation in a vacuum. The remaining oil is crystallized from hexane.
Loading…