Water → 4-Bromo-3-(2,3,4,6-tetra-O-pivaloyl-beta-D-glucopyranosyloxy)-1H-indazole

HRID 2223941Notes

Reaction equation

HRID 2223941 reaction equation
[Br:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]([OH:11])=[N:5][NH:6]2.C(=O)([O-])[O-].[K+].[K+].[C:18]([O:24][C@@H:25]1[C@@H:30]([O:31][C:32](=[O:37])[C:33]([CH3:36])([CH3:35])[CH3:34])[C@H:29]([O:38][C:39](=[O:44])[C:40]([CH3:43])([CH3:42])[CH3:41])[C@@H:28]([CH2:45][O:46][C:47](=[O:52])[C:48]([CH3:51])([CH3:50])[CH3:49])[O:27][C@@H:26]1Br)(=[O:23])[C:19]([CH3:22])([CH3:21])[CH3:20].O>C(#N)C>[Br:1][C:2]1[CH:10]=[CH:9][CH:8]=[C:7]2[C:3]=1[C:4]([O:11][C@@H:26]1[O:27][C@H:28]([CH2:45][O:46][C:47](=[O:52])[C:48]([CH3:51])([CH3:50])[CH3:49])[C@@H:29]([O:38][C:39](=[O:44])[C:40]([CH3:41])([CH3:42])[CH3:43])[C@H:30]([O:31][C:32](=[O:37])[C:33]([CH3:34])([CH3:35])[CH3:36])[C@H:25]1[O:24][C:18](=[O:23])[C:19]([CH3:22])([CH3:20])[CH3:21])=[N:5][NH:6]2

Participants

6

Reactant 4

HCID 962WaterHCID 11430Potassium CarbonateHCID 10886360((2R,3R,4S,5R,6R)-6-bromo-3,4,5-tris(2,2-dimethylpropanoyloxy)oxan-2-yl)methyl 2,2-dimethylpropanoateHCID 178518956HCID 178518956, compound

Product 1

HCID 673407304-Bromo-3-(2,3,4,6-tetra-O-pivaloyl-beta-D-glucopyranosyloxy)-1H-indazole

Reagents, catalysts & solvents 1

HCID 6342AcetonitrileSolvent

Procedure

A mixture of 4-bromo-1H-indazol-3-ol (1.27 g), potassium carbonate (1.65 g) and 2,3,4,6-tetra-O-pivaloyl-α-D-gluco-pyranosyl bromide (which can be prepared in a manner described in literature, for example, Liebigs Ann. Chem. 1982, pp. 41-48; J. Org. Chem. 1996, vol.61, pp. 9541-9545) (4.15 g) in acetonitrile (20 mL) was stirred at room temperature overnight. The reaction mixture was poured into water, and the resulting mixture was extracted with diethyl ether. The extract was washed with water and brine, and dried over an hydrous magnesium sulfate. The solvent was removed under reduced pressure, and the residue was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=5/1-2/1) to give the title compound (2.04 g).

Workup

  1. customcan be prepared in a manner
  2. extractionthe resulting mixture was extracted with diethyl ether
  3. washThe extract was washed with water and brine
  4. dry with materialdried over an hydrous magnesium sulfate
  5. customThe solvent was removed under reduced pressure
  6. customthe residue was purified by column chromatography on silica gel (eluent: n-hexane/ethyl acetate=5/1-2/1)

Sources & evidence

ORD record
ord-0e1091926ac5456896f26b40e54ba411
Source dataset
uspto-grants-2008_05
Patent number
US07375113B2

Reaction notes

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