Pyridine → methyl 2,3,4-tri-O-benzyl-6-O-trifluoromethylsulfonyl-alpha-D-glucopyranoside

HRID 2372150Notes

Reaction equation

HRID 2372150 reaction equation
N1C=CC=CC=1.[F:7][C:8]([F:21])([F:20])[S:9]([O:12]S(C(F)(F)F)(=O)=O)(=[O:11])=[O:10].[CH2:22]([O:29][C@@H:30]1[C@@H:37]([O:38][CH2:39][C:40]2[CH:45]=[CH:44][CH:43]=[CH:42][CH:41]=2)[C@H:36]([O:46][CH2:47][C:48]2[CH:53]=[CH:52][CH:51]=[CH:50][CH:49]=2)[C@@H:35]([CH2:54]O)[O:34][C@@H:31]1[O:32][CH3:33])[C:23]1[CH:28]=[CH:27][CH:26]=[CH:25][CH:24]=1>C(Cl)Cl>[CH2:22]([O:29][C@@H:30]1[C@@H:37]([O:38][CH2:39][C:40]2[CH:41]=[CH:42][CH:43]=[CH:44][CH:45]=2)[C@H:36]([O:46][CH2:47][C:48]2[CH:53]=[CH:52][CH:51]=[CH:50][CH:49]=2)[C@@H:35]([CH2:54][O:12][S:9]([C:8]([F:21])([F:20])[F:7])(=[O:11])=[O:10])[O:34][C@@H:31]1[O:32][CH3:33])[C:23]1[CH:24]=[CH:25][CH:26]=[CH:27][CH:28]=1

Participants

5

Reactant 3

HCID 1049PyridineHCID 67749Trifluoromethanesulfonic anhydrideHCID 11190476Methyl 2,3,4-tri-O-benzyl-alpha-D-glucopyranoside

Product 1

HCID 11072048methyl 2,3,4-tri-O-benzyl-6-O-trifluoromethylsulfonyl-alpha-D-glucopyranoside

Reagents, catalysts & solvents 1

HCID 6344DichloromethaneSolvent2×

Conditions

Temperature
-10 °C

Procedure

To a solution of dry pyridine (0.46 mL) in methylene chloride (17.5 mL) cooled to -15° C. was added trifluoromethanesulfonic anhydride (0.87 mL). The mixture was stirred during 15 min at -10° C., then methyl 2,3,4-tri-O-benzyl-α-D-glucopyranoside (1.2 g, 2.58 mmol) in methylene chloride (5 mL) was added [P. Kovac, V. Sklenar and C. Glaudemans, Carbohydr. Res. 175, 201 (1988)]. The mixture was stirred during 1.5 h at -10° C. The reaction mixture was washed with water. The organic layer was dried over sodium sulfate, filtered and concentrated under reduced pressure to afford an oil. Flash chromatography on silica gel and elution with a 7:3 mixture of hexane and ethyl acetate afforded the expected compound methyl 2,3,4-tri-O-benzyl-6-O-trifluoromethylsulfonyl-α-D-glucopyranoside which was crystallized from hexane (1.43 g, 93%); m.p. 44°-45° C.

Workup

  1. stirringThe mixture was stirred during 1.5 h at -10° C
  2. washThe reaction mixture was washed with water
  3. dry with materialThe organic layer was dried over sodium sulfate
  4. filtrationfiltered
  5. concentrationconcentrated under reduced pressure
  6. customto afford an oil
  7. washFlash chromatography on silica gel and elution
  8. additionwith a 7:3 mixture of hexane and ethyl acetate

Sources & evidence

ORD record
ord-dd507d54d9a54e52a0620c0005edf63b
Source dataset
uspto-grants-1992_03
Patent number
US05097023

Reaction notes

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