Trimethylsilyl triflate → HCID 9816508, compound

Temperature

-78 °C

523 mg of this debenzylated compound was dissolved in 15 ml of methylene chloride, and the solution was cooled to -78° C. under a stream of argon. To this solution was added dropwise a solution prepared by dissolving 271 mg of 80% m-chloroperbenzoic acid in methylene chloride. After the mixture was stirred for 30 minutes, a saturated sodium hydrogencarbonate solution was added to the mixture to terminate the reaction, and the temperature of the mixture was raised to room temperature. The mixture was then extracted with chloroform, and the organic layer was dried. The solvent was evaporated, and the residue was dissolved in 10 ml of acetonitrile. To this solution were added silylated N4 -acetylcytosine (prepared by reacting 644 mg of N4 -acetylcytosine with a catalytic amount of ammonium sulfate for 5 hours in hexamethyldisilazane under reflux) and 0.56 ml of trimethylsilyl triflate, and the mixture was stirred at 0° C. for 30 minutes. A saturated sodium hydrogencarbonate solution was added to the mixture, and the insoluble matter was removed by filtration on Celite. The resultant was extracted three times with chloroform, and the organic layer was dried. The filtrate was concentrated under reduced pressure, and the residue was purified by silica gel column chromatography. The fractions obtained by elution with 1% methanol/chloroform were combined and concentrated, thereby obtaining 200 mg (yield 23%) of the desired compound.

1. additionTo this solution was added dropwise a solution
2. customprepared
3. customto terminate
4. customthe reaction
5. temperaturethe temperature of the mixture was raised to room temperature
6. extractionThe mixture was then extracted with chloroform
7. customthe organic layer was dried
8. customThe solvent was evaporated
9. dissolutionthe residue was dissolved in 10 ml of acetonitrile
10. additionTo this solution were added silylated N4 -acetylcytosine (
11. customprepared
12. customfor 5 hours
13. stirringthe mixture was stirred at 0° C. for 30 minutes
14. customthe insoluble matter was removed by filtration on Celite
15. extractionThe resultant was extracted three times with chloroform
16. customthe organic layer was dried
17. concentrationThe filtrate was concentrated under reduced pressure
18. customthe residue was purified by silica gel column chromatography
19. customThe fractions obtained by elution with 1% methanol/chloroform
20. concentrationconcentrated

ORD record

ord-2df9d4e825a841f4b1edd347debb1f3d

Source dataset

uspto-grants-1998_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US05811408