Trimethyl orthoformate → methyl 4-[(3aR,4R,6R,6aR)-6-(hydroxymethyl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl]-3-oxo-3,4-dihydro-2-pyrazinecarboxylate

HRID 392309Notes

Reaction equation

HRID 392309 reaction equation
[OH:1][C@@H:2]1[C@H:6]([OH:7])[C@@H:5]([CH2:8][OH:9])[O:4][C@H:3]1[N:10]1[CH:15]=[CH:14][N:13]=[C:12]([C:16]([O:18][CH3:19])=[O:17])[C:11]1=[O:20].C(OC)(OC)OC.O.[C:29]1(C)[CH:34]=CC(S(O)(=O)=O)=C[CH:30]=1>CC(C)=O>[OH:9][CH2:8][C@@H:5]1[C@H:6]2[O:7][C:29]([CH3:34])([CH3:30])[O:1][C@H:2]2[C@H:3]([N:10]2[CH:15]=[CH:14][N:13]=[C:12]([C:16]([O:18][CH3:19])=[O:17])[C:11]2=[O:20])[O:4]1

Participants

5

Reactant 3

HCID 9005Trimethyl orthoformateHCID 521998p-Toluenesulfonic acid monohydrateHCID 11492964methyl 4-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydro-2-furanyl]-3-oxo-3,4-dihydro-2-pyrazinecarboxylate

Product 1

HCID 60126642methyl 4-[(3aR,4R,6R,6aR)-6-(hydroxymethyl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl]-3-oxo-3,4-dihydro-2-pyrazinecarboxylateYield 865.6%

Reagents, catalysts & solvents 1

HCID 180AcetoneSolvent

Procedure

In 5 mL of acetone was suspended 0.50 g of methyl 4-[(2R,3R,4S,5R)-3,4-dihydroxy-5-(hydroxymethyl)tetrahydro-2-furanyl]-3-oxo-3,4-dihydro-2-pyrazinecarboxylate. Then, 1 ml of trimethyl orthoformate and 33 mg of p-toluenesulfonic acid monohydrate were successively added, the mixture thus obtained was heated under reflux for one hour, and the solvent was removed under reduced pressure. By purifying the residue by column chromatography [eluent: ethyl acetate], 0.49 g of methyl 4-[(3aR,4R,6R,6aR)-6-(hydroxymethyl)-2,2-dimethyltetrahydrofuro[3,4-d][1,3]dioxol-4-yl]-3-oxo-3,4-dihydro-2-pyrazinecarboxylate was obtained as a white-colored solid product.

Workup

  1. customthe mixture thus obtained
  2. temperaturewas heated
  3. temperatureunder reflux for one hour
  4. customthe solvent was removed under reduced pressure
  5. customBy purifying the residue by column chromatography [eluent: ethyl acetate]

Sources & evidence

ORD record
ord-ed4aafc81f2547beaab02ae600a94142
Source dataset
uspto-grants-2004_10
Patent number
US06800629B2

Reaction notes

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