Hydrogen Bromide → 2-Bromomethyl-4-(2,3,4,6-tetra-O-acetyl-D-glucopyranos-1-yl)-benzonitrile

HRID 502852Notes

Reaction equation

[BrH:1].C1(O[CH2:9][C:10]2[CH:17]=[C:16]([C:18]3([O:36][C@H:35]([CH2:37][O:38][C:39](=[O:41])[CH3:40])[C@@H:30]([O:31][C:32](=[O:34])[CH3:33])[C@H:25]([O:26][C:27](=[O:29])[CH3:28])[C@H:20]3[O:21][C:22](=[O:24])[CH3:23])[OH:19])[CH:15]=[CH:14][C:11]=2[C:12]#[N:13])C=CC=CC=1.C(OC(=O)C)(=O)C.C(=O)([O-])[O-].[K+].[K+]>C(O)(=O)C>[Br:1][CH2:9][C:10]1[CH:17]=[C:16]([C:18]2([O:36][C@H:35]([CH2:37][O:38][C:39](=[O:41])[CH3:40])[C@@H:30]([O:31][C:32](=[O:34])[CH3:33])[C@H:25]([O:26][C:27](=[O:29])[CH3:28])[C@H:20]2[O:21][C:22](=[O:24])[CH3:23])[OH:19])[CH:15]=[CH:14][C:11]=1[C:12]#[N:13]

Participants

Conditions

Temperature: 55 °C

Procedure

A 33% solution of hydrobromic acid in acetic acid (15 mL) is added to a solution of 2-phenyloxymethyl-4-(2,3,4,6-tetra-O-acetyl-D-glucopyranos-1-yl)-benzonitrile (0.71 g) and acetic anhydride (0.12 mL) in acetic acid (10 ml). The resulting solution is stirred at 55° C. for 6 h and then cooled in an ice-bath. The reaction mixture is neutralized with chilled aqueous potassium carbonate solution, and the resultant mixture is extracted with ethyl acetate. The combined organic extracts are dried over sodium sulfate and the solvent is removed under reduced pressure. The residue is taken up in ethyl acetate/cyclohexane (1:5), and the precipitate is separated by filtration and dried at 50° C. to give the pure product.

Workup

temperaturecooled in an ice-bath
extractionthe resultant mixture is extracted with ethyl acetate
dry with materialThe combined organic extracts are dried over sodium sulfate
customthe solvent is removed under reduced pressure
customthe precipitate is separated by filtration
customdried at 50° C.
customto give the pure product

Sources & evidence

ORD record: ord-80bcde0e4eeb469c84ec539c92aa4c3e
Source dataset: uspto-grants-2010_08
DOI: 10.6084/m9.figshare.5104873.v1
Patent number: US07776830B2

Reaction notes

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