Hydrochloric Acid → Cytarabine Hydrochloride

Temperature

2 °C

A 5 L, 3-neck flask equipped with an overhead stirrer and thermocouple was charged with cytarabine (500 g, 2.06 mol) and methanol (2.0 L). The suspension was cooled to 2° C. HCl gas was bubbled in, giving a very thick mixture and an exotherm to 25° C. The suspension was diluted with methanol (0.5 L) to facilitate stirring. A total of 108 g (2.96 mol) of HCl gas was added. The mixture was stirred for 4 hours at 20° C. then filtered to collect the solid. The solid was washed with MTBE (3×250 mL) and dried in a vacuum oven at 70° C. to give 555 g (96% yield) of cytarabine hydrochloride as a flocculent, white solid.

1. customA 5 L, 3-neck flask equipped with an overhead stirrer
2. customHCl gas was bubbled in,
3. customgiving a very thick mixture
4. customto 25° C
5. stirringThe mixture was stirred for 4 hours at 20° C.
6. filtrationthen filtered
7. customto collect the solid
8. washThe solid was washed with MTBE (3×250 mL)
9. customdried in a vacuum oven at 70° C.

ORD record

ord-e8283582e54f4892a69fd5f201a4c969

Source dataset

uspto-grants-2009_03

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07498320B2