Sodium hydride → (3S,4S,5R)-6-allyloxy-3,4,5-tris-benzyloxy-2,2-bis-(4-methoxy-benzyloxymethyl)-tetrahydro-pyran

HRID 659890

Reaction equation

HRID 659890 reaction equation
[CH2:1]([O:4][CH:5]1[O:10][C:9]([CH2:13][OH:14])([CH2:11][OH:12])[C@@H:8]([O:15][CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[C@H:7]([O:23][CH2:24][C:25]2[CH:30]=[CH:29][CH:28]=[CH:27][CH:26]=2)[C@H:6]1[O:31][CH2:32][C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1)[CH:2]=[CH2:3].[H-].[Na+].Br[CH2:42][C:43]1[CH:48]=[CH:47][C:46]([O:49][CH3:50])=[CH:45][CH:44]=1>CN(C)C=O>[CH2:1]([O:4][CH:5]1[O:10][C:9]([CH2:11][O:12][CH2:42][C:43]2[CH:48]=[CH:47][C:46]([O:49][CH3:50])=[CH:45][CH:44]=2)([CH2:13][O:14][CH2:42][C:43]2[CH:48]=[CH:47][C:46]([O:49][CH3:50])=[CH:45][CH:44]=2)[C@@H:8]([O:15][CH2:16][C:17]2[CH:22]=[CH:21][CH:20]=[CH:19][CH:18]=2)[C@H:7]([O:23][CH2:24][C:25]2[CH:26]=[CH:27][CH:28]=[CH:29][CH:30]=2)[C@H:6]1[O:31][CH2:32][C:33]1[CH:34]=[CH:35][CH:36]=[CH:37][CH:38]=1)[CH:2]=[CH2:3]

Participants

5

Reactant 3

HCID 24758Sodium hydrideHCID 1650214-Methoxybenzyl bromideHCID 52952501((3S,4S,5R)-6-allyloxy-3,4,5-tris-benzyloxy-2-hydroxymethyl-tetrahydro-pyran-2-yl)-methanol

Product 1

HCID 59226809(3S,4S,5R)-6-allyloxy-3,4,5-tris-benzyloxy-2,2-bis-(4-methoxy-benzyloxymethyl)-tetrahydro-pyranYield 52%

Reagents, catalysts & solvents 1

HCID 6228DimethylformamideSolvent

Conditions

Temperature
0 °C

Procedure

The starting diol [((3S,4S,5R)-6-allyloxy-3,4,5-tris-benzyloxy-2-hydroxymethyl-tetrahydro-pyran-2-yl)-methanol (I-1b: 10 g, 19.208 mmol) was dissolved in N,N-dimethylformamide (70 mL) and cooled to 0° C. Sodium hydride (60% dispersion in mineral oil, 1.69 g, 42.3 mmol) was added and the reaction was allowed to stir at 0° C. for 1 hour before the addition of 1-bromomethyl-4-methoxy-benzene (5.96 mL, 40.3 mmol). The reaction was then heated to 60° C. overnight. The mixture was cooled down to room temperature and the reaction was quenched with water and extracted with ethyl acetate (2 times). The combined organic layers were washed with water, brine, dried over sodium sulfate, filtered and concentrated under reduced pressure. The reaction was then chromatographed over silica gel (eluting with a gradient of 0 to 80% ethyl acetate in heptane) yielding 7.55 g (52% yield) of product (I-1c). MS 778.8 (M+NH4+; positive mode).

Workup

  1. temperatureThe reaction was then heated to 60° C. overnight
  2. temperatureThe mixture was cooled down to room temperature
  3. customthe reaction was quenched with water
  4. extractionextracted with ethyl acetate (2 times)
  5. washThe combined organic layers were washed with water, brine
  6. dry with materialdried over sodium sulfate
  7. filtrationfiltered
  8. concentrationconcentrated under reduced pressure
  9. customThe reaction was then chromatographed over silica gel (
  10. washeluting with a gradient of 0 to 80% ethyl acetate in heptane)

Sources & evidence

ORD record
ord-fa00090073cd4710aba5608de16b0a94
Source dataset
uspto-grants-2011_12
Patent number
US08080580B2

Linked notes

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