Pyridine → (2R,3R,4R,5S,6S)-3,4,5-Tris(benzyloxy)-2-(benzyloxymethyl)-6-(3-(bromomethyl)-4-chlorophenyl)tetrahydro-2H-pyran

HRID 576362Notes

Reaction equation

HRID 576362 reaction equation
[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([C@H:8]2[C@H:13]([O:14][CH2:15][C:16]3[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=3)[C@@H:12]([O:22][CH2:23][C:24]3[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=3)[C@H:11]([O:30][CH2:31][C:32]3[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=3)[C@@H:10]([CH2:38][O:39][CH2:40][C:41]3[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=3)[O:9]2)=[CH:4][C:3]=1[CH2:47]O.P(Br)(Br)[Br:50].N1C=CC=CC=1>CCOCC>[CH2:31]([O:30][C@H:11]1[C@H:12]([O:22][CH2:23][C:24]2[CH:29]=[CH:28][CH:27]=[CH:26][CH:25]=2)[C@@H:13]([O:14][CH2:15][C:16]2[CH:21]=[CH:20][CH:19]=[CH:18][CH:17]=2)[C@H:8]([C:5]2[CH:6]=[CH:7][C:2]([Cl:1])=[C:3]([CH2:47][Br:50])[CH:4]=2)[O:9][C@@H:10]1[CH2:38][O:39][CH2:40][C:41]1[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=1)[C:32]1[CH:37]=[CH:36][CH:35]=[CH:34][CH:33]=1

Participants

5

Reactant 3

HCID 1049PyridineHCID 24614Phosphorus tribromideHCID 86714065HCID 86714065, compound

Product 1

HCID 86714066(2R,3R,4R,5S,6S)-3,4,5-Tris(benzyloxy)-2-(benzyloxymethyl)-6-(3-(bromomethyl)-4-chlorophenyl)tetrahydro-2H-pyranYield 203.6%

Reagents, catalysts & solvents 1

HCID 3283Diethyl EtherSolvent

Procedure

To a solution of alcohol 105 (5.33 g, 8.01 mmol) in ether (50 mL) were added phosphorus tribromide (0.26 mL, 2.80 mmol) and catalytic amount of pyridine at 0° C. The mixture was allowed to warm to room temperature and stirred at room temperature for 15 hours. The mixture was extracted with EtOAc/H2O (100 mL/150 mL). The combined organic layer was dried over MgSO4, filtered, and concentrated in vacuo. The residue was purified by silica gel column chromatography to provide the title bromide 106 (4.15 g, 71%).

Workup

  1. extractionThe mixture was extracted with EtOAc/H2O (100 mL/150 mL)
  2. dry with materialThe combined organic layer was dried over MgSO4
  3. filtrationfiltered
  4. concentrationconcentrated in vacuo
  5. customThe residue was purified by silica gel column chromatography

Sources & evidence

ORD record
ord-95c732a21ada4c67be83f287acc63c40
Source dataset
uspto-grants-2015_05
Patent number
US09034921B2

Reaction notes

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