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. them recooled to -70° C. and to the resulting solution of lithium diisopropylamide (LDA) (10 mmol) at -70° C. was added dropwise 3-chloro-4ethylpyridine (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 recrystallised 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-c69db4d8952f41eeb0ee5781ca4b8497

Source dataset

uspto-grants-1996_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05567817