Hydrochloric Acid → HCID 4872096, Verbindung

13.20 g of 60% NaH (in paraffin oil) (0.33 mol) was added to 100 ml of dry diethyl ether. With vigorous stirring, 19.83 g (0.20 mol) of N-methylpyrrolidone were added. Then within one hour 121.30 g (0.83 mol) of diethyl oxalate were added dropwise. After the addition the suspension was heated to 40° C. and stirred for 21 hours. The reaction mixture was then cooled in an ice bath, mixed with 66 ml 5M HCl and the resulting 2-phase mixture was filtered once. Then the two phases were separated, and the aqueous phase was extracted twice with 100 ml diethyl ether. The combined ethereal phases were dried over Na2SO4 and concentrated on a rotary evaporator to dryness. The oily residue was cooled to −80° C. and mixed with 200 ml diethyl ether. The resulting brown solid was filtered off and recrystallized from heptane. This gave 5.2 g product as white needles.

1. additionAfter the addition the suspension
2. temperatureThe reaction mixture was then cooled in an ice bath
3. filtrationthe resulting 2-phase mixture was filtered once
4. customThen the two phases were separated
5. extractionthe aqueous phase was extracted twice with 100 ml diethyl ether
6. dry with materialThe combined ethereal phases were dried over Na2SO4
7. concentrationconcentrated on a rotary evaporator to dryness
8. temperatureThe oily residue was cooled to −80° C.
9. additionmixed with 200 ml diethyl ether
10. filtrationThe resulting brown solid was filtered off
11. customrecrystallized from heptane

ORD-Eintrag

ord-7fd9735e1dee453e8bc3ce9e99bb5328

Quelldatensatz

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09394324B2