Benzene → HCID 69919408, compound

HRID 2307744Notes

Reaction equation

HRID 2307744 reaction equation
[C:1]([O:4][C@H:5]1[C@@H:11]([O:12][C:13](=[O:15])[CH3:14])[C@H:10]([O:16][C:17](=[O:19])[CH3:18])[C@@H:9]([CH2:20][O:21][C:22](=[O:24])[CH3:23])[O:8][CH:6]1[OH:7])(=[O:3])[CH3:2].[OH-].[K+].[CH2:27]([O:34]CCBr)[C:28]1C=CC=CC=1.C1C=CC=CC=1>S([O-])(O)(=O)=O.C([N+](CCCC)(CCCC)CCCC)CCC.C(OCOCC)C>[C:1]([O:4][C@H:5]1[C@@H:11]([O:12][C:13](=[O:15])[CH3:14])[C@H:10]([O:16][C:17](=[O:19])[CH3:18])[C@@H:9]([CH2:20][O:21][C:22](=[O:24])[CH3:23])[O:8][CH:6]1[O:7][CH2:28][CH2:27][OH:34])(=[O:3])[CH3:2]

Participants

7

Reactant 4

HCID 241BenzeneHCID 14797Potassium HydroxideHCID 73833Benzene, ((2-bromoethoxy)methyl)-HCID 117598232,3,4,6-TETRA-O-ACETYL-D-MANNOPYRANOSE

Product 1

HCID 69919408HCID 69919408, compound

Reagents, catalysts & solvents 2

HCID 94433Tetrabutylammonium hydrogen sulfateCatalystHCID 10024DiethoxymethaneSolvent

Conditions

Temperature
0 °C

Procedure

A mixture that consists of 34.83 g (100 mmol) of 2,3,4,6-tetra-O-acetyl-mannopyranose, 1.7 g (5 mmol) of tetrabutylammonium hydrogen sulfate and 82.93 g (600 mmol) of fine-powder potassium hydroxide in 350 ml of diethoxymethane is cooled to 0° C. At 0° C., 32.26 g (150 mmol) of 2-benzyloxy-ethylbromide is added in drops over 30 minutes while being stirred vigorously. It is stirred for two hours at 0° C. 300 ml of benzene is added, solid is filtered out, and the filtrate is evaporated to the dry state in a vacuum. The residue is taken up in 500 ml of ethanol. 5 g of palladium (10%) on activated carbon is added thereto and hydrogenated until hydrogen absorption is completed. Then, catalyst is suctioned out, it is rewashed with a little ethanol and evaporated to the dry state in a vacuum. The residue is chromatographed on silica gel (mobile solvent: dichloromethane/nhexane/ethanol=20:8:2). The product-containing fractions are concentrated by evaporation.

Workup

  1. stirringIt is stirred for two hours at 0° C
  2. filtrationsolid is filtered out
  3. customthe filtrate is evaporated to the dry state in a vacuum
  4. addition5 g of palladium (10%) on activated carbon is added
  5. customhydrogenated until hydrogen absorption
  6. customevaporated to the dry state in a vacuum
  7. customThe residue is chromatographed on silica gel (mobile solvent: dichloromethane/nhexane/ethanol=20:8:2)
  8. concentrationThe product-containing fractions are concentrated by evaporation

Sources & evidence

ORD record
ord-da79cd4b9ee941a2974bce16c398b5ea
Source dataset
uspto-grants-2004_12
Patent number
US06831164B2

Reaction notes

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