C([N:20]1[CH:24]=[C:23]([C:25](=[O:28])[CH:26]=[CH2:27])[N:22]=[CH:21]1)(C1C=CC=CC=1)(C1C=CC=CC=1)C1C=CC=CC=1.[BrH:29].C(OC(C)C)(C)C>C(O)(=O)C>[Br:29][CH2:27][CH2:26][C:25]([C:23]1[N:22]=[CH:21][NH:20][CH:24]=1)=[O:28]1-(1-Trityl-1H-imidazol-4-yl)-2-propen-1-one (29.0 g) was dissolved in acetic acid (130 ml) and the mixture was cooled to 10° C. A 25% solution of hydrogen bromide in acetic acid (100 ml) was added and the mixture was stirred at room temperature for 2 h. Isopropyl ether was added to the reaction mixture and the precipitated crystals were collected by filtration and washed with diisopropyl ether to give the title compound (22.3 g) as a pale yellow powder.
Wird geladen…
