Carbon tetrabromide → HCID 18633461, compound

A mixture of 0.4 g of 1-(2-deoxy-2-fluoro-β-D-arabinofuranosyl)-5-ethyluracil, 0.44 g of triphenylphosphine, 0.48 g of sodium azide and 6 ml of dry dimethylformamide was stirred at room temperature under nitrogen while 0.48 g of carbon tetrabromide was added portionwise. The mixture was stirred at room temperature under nitrogen for 20 hours. 3 ml of methanol were added, the mixture was stirred for 0.5 hour and then evaporated. The residue was stirred for 0.5 hour with 8 ml of 0.5M sodium hydroxide solution. The resulting suspension was filtered and the insoluble triphenylphosphine oxide was washed with water. The filtrate was acidified to pH 5 by the addition of hydrochloric acid and then extracted three times with 20 ml of ethyl acetate. The extracts were dried over magnesium sulfate, filtered and evaporated. The residual solid was washed on to a filter with 10 ml of diethyl ether/petroleum ether (1:1) and then dried in vacuo to give 0.4 g of 1 -(5-azido-2,5-dideoxy-2-fluoro-β-D-arabinofuranosyl)-5-ethyluracil as a white solid of melting point 185°-188° C.

1. additionwas added portionwise
2. stirringthe mixture was stirred for 0.5 hour
3. customevaporated
4. stirringThe residue was stirred for 0.5 hour with 8 ml of 0.5M sodium hydroxide solution
5. filtrationThe resulting suspension was filtered
6. washthe insoluble triphenylphosphine oxide was washed with water
7. additionThe filtrate was acidified to pH 5 by the addition of hydrochloric acid
8. extractionextracted three times with 20 ml of ethyl acetate
9. dry with materialThe extracts were dried over magnesium sulfate
10. filtrationfiltered
11. customevaporated
12. washThe residual solid was washed on to
13. filtrationa filter with 10 ml of diethyl ether/petroleum ether (1:1)
14. customdried in vacuo

ORD record

ord-021dfd8af80a445883e362e69cf55ec4

Source dataset

uspto-grants-1989_07

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US04851519