Dimethylformamide → HCID 10864637, compound

HRID 580024Notes

Reaction equation

HRID 580024 reaction equation
[CH2:1]([O:8][C@@H:9]1[C@@H:15]([O:16][CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[C@H:14]([O:24][CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[C@@H:13]([CH2:32][O:33][CH2:34][C:35]2[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=2)[O:12][CH:10]1O)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.C(Cl)(=O)C([Cl:44])=O.CN(C)C=O>C(Cl)Cl>[CH2:1]([O:8][C@@H:9]1[C@@H:15]([O:16][CH2:17][C:18]2[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=2)[C@H:14]([O:24][CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[C@@H:13]([CH2:32][O:33][CH2:34][C:35]2[CH:40]=[CH:39][CH:38]=[CH:37][CH:36]=2)[O:12][C@@H:10]1[Cl:44])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1

Participants

5

Reactant 3

HCID 6228DimethylformamideHCID 65578Oxalyl chlorideHCID 109405022,3,4,6-Tetrakis-O-(phenylmethyl)-D-glucopyranose

Product 1

HCID 10864637HCID 10864637, compoundYield 80.7%

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent

Procedure

3.0 g (5.5 mmol) of 2,3,4,6-tetra-O-benzyl-D-glucopyranose were dissolved in 30 ml of anhydrous methylene chloride and the solution was stirred with 1.45 ml (2.11 g; 16.5 mmol) of oxalyl dichloride and 0.3 ml of dimethylformamide at room temperature. After one hour, the solution was concentrated under a high vacuum, the residue was taken up in 10 ml of methylene chloride and the mixture was filtered over about 10 g of silica gel. Renewed concentration gave 2.48 g (80%) of 2,3,4,6-tetra-O-benzyl-α-D-glucopyranosyl chloride as a colorless syrup. The crude product was taken up in 20 ml of anhydrous acetonitrile and the mixture was heated under reflux with 3.0 g (38 mmol) of potassium hydrogen fluoride (24 hours at 100° C., dried over P2O5) for 8 hours. It was possible to purify the crude product by column chromatography on silica gel (methylene chloride/ether, 20:1). Yield: 1.1 g (47%) of 2,3,4,6 -tetra-O-benzyl-α-D-glucopyranosyl fluoride.

Workup

  1. concentrationthe solution was concentrated under a high vacuum
  2. filtrationthe mixture was filtered over about 10 g of silica gel
  3. concentrationRenewed concentration

Sources & evidence

ORD record
ord-7a5c298d4dd2441ba8adfafd1f90ae68
Source dataset
uspto-grants-1988_06
Patent number
US04751291

Reaction notes

Loading…