Water → 2-[(5-Bromopyridin-3-yl)methyl]-5-(4-chlorophenyl)-4-(3,3,3-trifluoro-2-hydroxypropyl)-2,4-di-hydro-3H-1,2,4-triazol-3-one

Participants

Reaction Conditions

Reaction Steps

300 mg (0.98 mmol) of the compound from Example 4A and 953 mg (2.93 mmol) of cesium carbonate were dissolved in 4 ml of DMF, and 261 mg (1.10 mmol) of 3-bromo-5-(chloromethyl)-pyridine hydrochloride were added. The mixture was stirred initially at 40° C. for 20 h and then at 70° C. for 24 h. To bring the reaction to completion, a further 130 mg (0.55 mmol) of 3-bromo-5-(chloromethyl)pyridine hydrochloride and 450 mg (1.38 mmol) of cesium carbonate were then added, and the reaction was stirred at 70° C. for another 20 h. After cooling to RT, 10 ml of water were added and the mixture was extracted three times with in each case 10 ml of ethyl acetate. The combined organic phases were dried over magnesium sulfate, filtered and concentrated under reduced pressure. The crude product was purified by preparative HPLC [Method 19]. This gave 263 mg (56% of theory) of the target compound.

Provenance & Evidence