Allyl bromide → 3'-O-Allyl-5'-O-(tert-butyldimethylsilyl)-5-iodo-2'-deoxycytidine

HRID 1013854Notes

Reaction equation

HRID 1013854 reaction equation
[Si:1]([O:8][CH2:9][C@H:10]1[O:14][C@@H:13]([N:15]2[CH:22]=[C:21]([I:23])[C:19]([NH2:20])=[N:18][C:16]2=[O:17])[CH2:12][C@@H:11]1[OH:24])([C:4]([CH3:7])([CH3:6])[CH3:5])([CH3:3])[CH3:2].[H-].[Na+].[CH2:27](Br)[CH:28]=[CH2:29].C([O-])(O)=O.[Na+]>C1COCC1>[CH2:29]([O:24][C@@H:11]1[C@@H:10]([CH2:9][O:8][Si:1]([C:4]([CH3:7])([CH3:5])[CH3:6])([CH3:2])[CH3:3])[O:14][C@@H:13]([N:15]2[CH:22]=[C:21]([I:23])[C:19]([NH2:20])=[N:18][C:16]2=[O:17])[CH2:12]1)[CH:28]=[CH2:27]

Participants

6

Reactant 4

HCID 7841Allyl bromideHCID 24758Sodium hydrideHCID 516892Sodium BicarbonateHCID 573524154-Amino-1-((2R,4S,5R)-5-(((tert-butyldimethylsilyl)oxy)methyl)-4-hydroxytetrahydrofuran-2-yl)-5-iodopyrimidin-2(1H)-one

Product 1

HCID 666840933'-O-Allyl-5'-O-(tert-butyldimethylsilyl)-5-iodo-2'-deoxycytidineYield 42%

Reagents, catalysts & solvents 1

HCID 8028TetrahydrofuranSolvent

Procedure

To a stirred solution of 21 (1.18 g; 2.52 mmol) in anhydrous THF (43 mL) was added 95% NaH powder (128 mg; 5.07 mmol). The suspension was stirred at room temperature for 45 min. Allyl bromide (240 μL, 2.79 mmol) was then added at 0° C. and the reaction was stirred at room temperature for 14 h with exclusion of moisture. Saturated aqueous NaHCO3 (10 mL) was added at 0° C. and stirred for 10 min. Most THF was evaporated and the residue was dissolved in ethyl acetate (150 mL). The solution was washed by saturated aqueous NaHCO3 and NaCl respectively, and dried over anhydrous Na2SO4. After evaporation of the solvent, the residue was purified by flash column chromatography over silica gel using ethyl acetate as the eluent to afford 22 as white solid (537 mg; 42% yield): 1H NMR (400 MHz, CD3OD) δ 8.15 (s, 1H, 6-H), 6.12 (dd, J=5.6, 8.0 Hz, 1H, 1′-H), 4.17 (m, 1H, 4′-H), 4.14 (m, 1H, 3′-H), 3.98-4.10 (m, 2H, CH2CH═CH2), 3.93 (dd, J=2.8, 11.5 Hz, 1H, one of 5′-H), 3.83 (dd, J=2.8, 11.5 Hz, 1H, one of 5′-H), 2.53-2.60 (ddd, J=1.7, 5.6, 13.6 Hz, 1H, one of 2′-H), 1.94-2.02 (ddd, J=5.9, 8.0, 13.6 Hz, 1H, one of 2′-H), 0.94 (s, 9H, C(CH3)3), 0.17 (s, 3H, one of SiCH3), 0.16 (s, 3H, one of SiCH3); 13C NMR (100 MHz, CD3OD) δ 165.4, 156.7, 147.7, 135.5, 117.2, 88.2, 87.0, 80.4, 70.9, 64.8, 57.3, 40.1, 26.7, 19.4, −4.7, −4.9; HRMS (FAB+) calcd for C18H31O4N3SiI (M+H+): 508.1129. Found: 508.1123.

Workup

  1. stirringthe reaction was stirred at room temperature for 14 h with exclusion of moisture
  2. stirringstirred for 10 min
  3. customMost THF was evaporated
  4. dissolutionthe residue was dissolved in ethyl acetate (150 mL)
  5. washThe solution was washed by saturated aqueous NaHCO3 and NaCl respectively
  6. dry with materialdried over anhydrous Na2SO4
  7. customAfter evaporation of the solvent
  8. customthe residue was purified by flash column chromatography over silica gel

Sources & evidence

ORD record
ord-51813949e70940328ff04fa9d52f164d
Source dataset
uspto-grants-2011_07
Patent number
US07982029B2

Reaction notes

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