Formaldehyde → 5'-O-(t-Butyldimethylsilyl)-3'-Deoxy-3'-[(Methyleneamino)oxy]thymidine

HRID 1955833Notes

Reaction equation

HRID 1955833 reaction equation
[CH2:1]=O.[NH2:3][O:4][C@@H:5]1[C@@H:9]([CH2:10][O:11][Si:12]([C:15]([CH3:18])([CH3:17])[CH3:16])([CH3:14])[CH3:13])[O:8][C@@H:7]([N:19]2[CH:27]=[C:25]([CH3:26])[C:23](=[O:24])[NH:22][C:20]2=[O:21])[CH2:6]1>CO>[Si:12]([O:11][CH2:10][C@H:9]1[O:8][C@@H:7]([N:19]2[CH:27]=[C:25]([CH3:26])[C:23](=[O:24])[NH:22][C:20]2=[O:21])[CH2:6][C@@H:5]1[O:4][N:3]=[CH2:1])([C:15]([CH3:18])([CH3:16])[CH3:17])([CH3:13])[CH3:14]

Participants

4

Reactant 2

HCID 712Formaldehyde2×HCID 186587053'-O-Amino-5'-O-(t-Butyldimethylsilyl)thymidine

Product 1

HCID 228586505'-O-(t-Butyldimethylsilyl)-3'-Deoxy-3'-[(Methyleneamino)oxy]thymidineYield 95%

Reagents, catalysts & solvents 1

HCID 887MethanolSolvent

Procedure

A solution of HCHO (20% aqueous, 1 ml) was added dropwise to a stirred solution of 3'-O-amino-5'-O-(t-butyldimethylsilyl)thymidine (3, 7.42 g, 20 mmol) in dry MeOH (400 ml) at room temperature. After 6 h, another portion of HCHO (20% aqueous, 1.5 ml) was added and stirring continued for 16 h. The resulting solution was evaporated under reduced pressure, and the residue was purified by chromatography on silica gel to give compound 10 (7.25 g, 95%) as clear foam. 1H NMR (CDCl3) δ0.1 [s, 3, (CH3)2 ], 0.9 [s, 9, (CH3)3 ], 1.9 (s, 3, CH3), 2.25-2.72 (m, 2, 2'CH2), 3.85-4.15 (2 m, 3, 5'CH2, 4'H), 4.85 (m, 1, 3'H), 6.25 (dd, 1, 1'H)), 6.5 and 6.95 (2d, 2, N=CH2), 7.43 (s, 1, (6H), 9.2 (br s, 1 NH).

Workup

  1. waitcontinued for 16 h
  2. customThe resulting solution was evaporated under reduced pressure
  3. customthe residue was purified by chromatography on silica gel

Sources & evidence

ORD record
ord-22570cf8fe1e4cbcad1bfb1134922d8a
Source dataset
uspto-grants-1998_07
Patent number
US05777092

Reaction notes

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