Imidazole → HCID 22877779, compound

HRID 1488552Notes

Reaction equation

HRID 1488552 reaction equation
[CH3:1][O:2][C:3]1[CH:40]=[CH:39][C:6]([C:7]([O:22][CH2:23][C@H:24]2[O:28][C@@H:27]([N:29]3[CH:37]=[C:35]([CH3:36])[C:33](=[O:34])[NH:32][C:30]3=[O:31])[CH2:26][C@@H:25]2[OH:38])([C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)[C:8]2[CH:13]=[CH:12][C:11]([O:14][CH3:15])=[CH:10][CH:9]=2)=[CH:5][CH:4]=1.N1C=CN=C1.N1C=CC=CC=1.[CH:52]([Si:55](Cl)([CH:59]([CH3:61])[CH3:60])[CH:56]([CH3:58])[CH3:57])([CH3:54])[CH3:53]>CN(C)C=O.C(OCC)(=O)C>[CH:52]([Si:55]([CH:59]([CH3:61])[CH3:60])([CH:56]([CH3:58])[CH3:57])[O:38][C@@H:25]1[C@@H:24]([CH2:23][O:22][C:7]([C:16]2[CH:17]=[CH:18][CH:19]=[CH:20][CH:21]=2)([C:8]2[CH:13]=[CH:12][C:11]([O:14][CH3:15])=[CH:10][CH:9]=2)[C:6]2[CH:39]=[CH:40][C:3]([O:2][CH3:1])=[CH:4][CH:5]=2)[O:28][C@@H:27]([N:29]2[CH:37]=[C:35]([CH3:36])[C:33](=[O:34])[NH:32][C:30]2=[O:31])[CH2:26]1)([CH3:54])[CH3:53]

Participants

7

Reactant 4

HCID 795ImidazoleHCID 1049PyridineHCID 139400Triisopropylsilyl chloride2×HCID 1624195'-O-(4,4'-Dimethoxytrityl)thymidine

Product 1

HCID 22877779HCID 22877779, compoundYield 97.3%

Reagents, catalysts & solvents 2

HCID 6228DimethylformamideSolventHCID 8857Ethyl AcetateSolvent

Procedure

1.485 g (2.73 mmol) of 5'-O-(4,4'-dimethoxytrityl)thymidine and 0.37 g (5.45 mmol) of imidazole were first dried by azeotropic distillation under reduced pressure with pyridine and then dissolved in 6 ml of dimethylformamide. 875 μl (4.09 mmol) of triisopropylsilyl chloride were added to this solution, and the resulting mixture was stirred overnight at room temperature. At the end of this time, 875 μl of triisopropylsilyl chloride and 0.37 g of imisazole were added to the mixture, which was then stirred for one day. The reaction mixture was then diluted with 100 ml of ethyl acetate and the diluted mixture was washed twice, each time with 100 ml of a 5% w/v aqueous solution of sodium hydrogencarbonate. The organic layer was dried over anhydrous sodium sulfate and the solvent was removed by distillation under reduced pressure. The resulting residue was purified by column chromatography through 100 g of silica gel (70-230 mesh), using methylene chloride containing from 0 to 3% by volume of methanol as the eluent, to give 1.861 g (yield 97%) of the title compound.

Workup

  1. stirringwas then stirred for one day
  2. washthe diluted mixture was washed twice
  3. dry with materialThe organic layer was dried over anhydrous sodium sulfate
  4. customthe solvent was removed by distillation under reduced pressure
  5. customThe resulting residue was purified by column chromatography through 100 g of silica gel (70-230 mesh)

Sources & evidence

ORD record
ord-14c0dc660c2f4786b2b902febb01a6e5
Source dataset
uspto-grants-1997_10
Patent number
US05674856

Reaction notes

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