Reacción #554622

Ecuación de reacción

NaN3

cyclohexene

12

N2-isobutyryl-O6-diphenylcarbamoyl-3′-O-(methylthiomethyl)-5′-O-(tert-butyldimethylsilyl)-2′-deoxyguanosine

NH4F

→

14

Rendimiento 36.0%

N2-isobutyryl-O6-diphenylcarbamoyl-3′-O-azidomethyl-2′-deoxyguanosine

Rendimiento 36.0%

Disolventes

CH2Cl2

Condiciones de reacción

Tratamiento posterior

1. 1
   OtroThe solvent was then removed by rotary evaporation
2. 2
   Otrofurther dried under high vacuum for 10 minutes
3. 3
   workup.DISSOLUTIONThe crude product was then dissolved in 5 mL dry DMF
4. 4
   workup.STIRRINGstirred at room temperature for 3 h
5. 5
   OtroReaction mixture
6. 6
   Extracciónpartitioned H2O/CH2Cl2, the combined organic extract
7. 7
   Secadowas then dried over Na2SO4
8. 8
   Concentraciónconcentrated by rotary evaporation
9. 9
   workup.DISSOLUTIONThe crude was then dissolved in 5 mL dry MeOH
10. 10
    OtroThen MeOH solvent was removed by rotary evaporation
11. 11
    Otropartitioned (H2O/CH2Cl2)
12. 12
    SecadoThe combined organic part was dried over Na2SO4
13. 13
    Concentraciónconcentrated by rotary evaporation
14. 14
    Otropurified by silica gel column chromatography

Procedimiento

To 786 mg 12 (1.1 mmol) dissolved in 8 mL dry CH2Cl2 was treated with 0.56 mL cyclohexene and 180 μL SO2Cl2 (2.2 mmol) at 0° C. and stirred for 1.5 h at the same temperature. The solvent was then removed by rotary evaporation, and further dried under high vacuum for 10 minutes. The crude product was then dissolved in 5 mL dry DMF and reacted with 600 mg NaN3 (10 mmol) at 0° C. and stirred at room temperature for 3 h. Reaction mixture was then partitioned H2O/CH2Cl2, the combined organic extract was then dried over Na2SO4, and concentrated by rotary evaporation. The crude was then dissolved in 5 mL dry MeOH, treated with 500 mg NH4F (13.5 mmol) at room temperature for more than 24 h. Then MeOH solvent was removed by rotary evaporation, and partitioned (H2O/CH2Cl2). The combined organic part was dried over Na2SO4 and concentrated by rotary evaporation and purified by silica gel column chromatography resulting pure product of 14 as white powder (230 mg, ˜36% yield in three steps; hex:EtOAc 1:1 to 1:5, (Rf=˜0.3, Hex:EtOAc/1:4). HR-MS: Obs. m/z 588.2343, calcd for C28H30O6N9 588.2319 [M+H]+. 1H-NMR (DFM-d6): δH 8.64 (brs, 1H), 7.48-7.34 (m, 10H), 6.36 (t, J=7.0 Hz), 4.93 (m, 2H), 4.76 (m, 1H), 4.04 (m, 1H), 3.57 (m, 1H), 3.34 (m, 2H), 2.97 (m, 1H), 2.81 (m, 1H), and 1.10 (m, 6H).

Fuente