Acetone → HCID 13125037, compound

Temperature

5 °C

The 1-methylimidazole was dissolved in dry THF and the solution cooled to 5° C. A 10% excess n-butylithium was added over one hour period with the reaction vessel being maintained at a temperature range of 5°-20° C. under nitrogen. The solution at the end of the addition was homogenous and purplish in color. After stirring two hours at room temperature, the reaction flask was then cooled to ~10° C. and the acetone in dry THF was added slowly with stirring. After the addition the solution was allowed to stir at ambient temperature one hour then poured onto ice-water. The aqueous layer was acidified with dilute HCl and extracted with ether. The aqueous layer was then basified with K2CO3 then extracted with CH2Cl2 several times. The combined and dried CH2Cl2 extracts were concentrated to yield a white solid which was recrystallized from ethyl acetate; mp 128°-129° C. Structure was confirmed by IR and NMR.

1. additionA 10% excess n-butylithium was added over one hour period with the reaction vessel
2. temperaturebeing maintained at a temperature range of 5°-20° C. under nitrogen
3. additionThe solution at the end of the addition
4. temperaturethe reaction flask was then cooled to ~10° C.
5. stirringwith stirring
6. additionAfter the addition the solution
7. stirringto stir at ambient temperature one hour
8. additionthen poured onto ice-water
9. extractionextracted with ether
10. extractionthen extracted with CH2Cl2 several times
11. concentrationdried CH2Cl2 extracts were concentrated
12. customto yield a white solid which
13. customwas recrystallized from ethyl acetate

ORD record

ord-df72e482cf214bcab2ada1c316bebfac

Source dataset

uspto-grants-1984_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04428948