Water → 3-Hydroxy-2,2-dimethyl-3-(4-pyridyl)propionitrile

Temperatur

-78 °C

A solution of diisopropylamine (10.0 ml, 71.5 mmol) in tetrahydrofuran (150 ml) was cooled to −78° C. under a nitrogen atmosphere, and a 1.6 N solution of butyllithium in hexane was added dropwise thereto over 10 minutes. The mixture was cooled with ice-cold water for 20 minutes and then cooled to −78° C. again, and isobutyronitrile (3.03 ml, 33.3 mmol) was added dropwise to the mixture over five minutes. Further, 4-pyridinecarboxyaldehyde (3.18 ml, 33.3 mmol) was added dropwise thereto over five minutes, and the whole was stirred for one hour 20 minutes. Water (100 ml) was added to the reaction mixture, and the whole was extracted with ethyl acetate (200 ml) by using a continuous extracting apparatus for three days. The obtained organic layer was dried over anhydrous magnesium sulfate and concentrated under reduced pressure. The resulting solid was filtered off with diethyl ether to give 4.20 g (71.6%) of 3-hydroxy-2,2-dimethyl-3-(4-pyridyl)propionitrile as a colorless solid.

1. temperatureThe mixture was cooled with ice-cold water for 20 minutes
2. additionFurther, 4-pyridinecarboxyaldehyde (3.18 ml, 33.3 mmol) was added dropwise
3. waitover five minutes
4. extractionthe whole was extracted with ethyl acetate (200 ml)
5. customfor three days
6. dry with materialThe obtained organic layer was dried over anhydrous magnesium sulfate
7. concentrationconcentrated under reduced pressure
8. filtrationThe resulting solid was filtered off with diethyl ether

ORD-Eintrag

ord-5e6bacc9311e4ebc83b58c8f4a3c7cb6

Quelldatensatz

uspto-grants-2008_03

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US07345064B2