Diisopropylamine → 3-(3-Chloropyridin-4-yl)-2-(2,4-difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butan-2-ol

Temperature

-20 °C

To a solution of diisopropylamine (1.01 g, 10 mmol) in dry THF (60 ml) at -60° C. and under a nitrogen atmosphere was added dropwise a 1.6M solution of n-butyllithium in hexane (6.25 ml, 10 mmol). The mixture was allowed to warm to -20° C. then recooled to -70° C. and to the resulting solution of lithium diisopropylamide (LDA) (10 mmol) at -70° C. was added dropwise 3-chloro-4-ethylpyridine (see D. L. Comins et al, Heterocycles, 22, 339 (1984)) (1.41 g, 10 mmol). The resulting mixture was stirred at this temperature for 15 minutes after which time a solution of 1-(2,4-difluorophenyl)-2-(1H-1,2,4-triazol-1-yl)ethanone (2.23 g, 10 mmol) in THF (15 ml) was added. This mixture was allowed to warm to room temperature over a 30 minute period and the reaction was quenched by the addition of water (30 ml) and extracted with ethyl acetate (3×60 ml). The combined organic extracts were dried over magnesium sulphate, filtered, concentrated under reduced pressure and the title compound isolated by "flash" chromatography on silica eluting with ethyl acetate. The product was recrystallized from ethyl acetate (yield=0.46 g), m.p. 182°-184° C. Found: C,55.76; H,4.15; N,15.23; C17H15ClF2N4O requires: C,55.98; H,4.14; N,15.36%.

1. additionwas added
2. temperatureto warm to room temperature over a 30 minute period
3. customthe reaction was quenched by the addition of water (30 ml)
4. extractionextracted with ethyl acetate (3×60 ml)
5. dry with materialThe combined organic extracts were dried over magnesium sulphate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure

ORD record

ord-725925af70c948aeb5898ebde8b984eb

Source dataset

uspto-grants-1994_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05278175