Hydrochloric Acid → HCID 54533163, compound

Temperature

-5 °C

A solution of 8.0 g (60.5 mmol) of malonic acid monoethylester, bipyridyl (catalytic) and 200 ml of dry THF was cooled to -35° C. under argon, treated with 32 ml of 1.9M n-butyllithium (60.8 mmol), and warmed to -5° C. To this suspension was added another 32 ml of 1.9M n-butyllithium until a pale pink color persisted for 10 minutes. The mixture was cooled to -78° C. To this mixture was added a solution of 6.3 g (30.2 mmol) of 2,4,5-trifluoro-6-methylbenzoyl chloride in 75 ml of dry THF, and the reaction mixture was stirred at -78° C. for one hour. The solution was then warmed to -35° C., poured onto a mixture of ice and 1N hydrochloric acid (70 ml), and extracted with ethyl acetate. The organic layer was washed with 5% sodium bicarbonate, 3M hydrochloric acid, and water, and was stirred over magnesium sulfate. Concentration gave an orange oil which was chromatographed on silica gel (E. Merck 230-400 Mesh), eluting with 80:20 chloroform:ethyl acetate, to give 7.2 g of the title compound.

1. temperatureThe mixture was cooled to -78° C
2. temperatureThe solution was then warmed to -35° C.
3. extractionextracted with ethyl acetate
4. washThe organic layer was washed with 5% sodium bicarbonate, 3M hydrochloric acid, and water
5. stirringwas stirred over magnesium sulfate
6. concentrationConcentration
7. customgave an orange oil which
8. customwas chromatographed on silica gel (E. Merck 230-400 Mesh)
9. washeluting with 80:20 chloroform

ORD record

ord-11b4dc4ba76a4c5bbaaccfe2c4315a09

Source dataset

uspto-grants-1990_04

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04920120