Fumaric Acid → HCID 19095312, compound

HRID 486560Notes

Reaction equation

HRID 486560 reaction equation
[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([C:9]2[N:13]3[CH2:14][CH2:15][N:16]=[C:17]([CH3:18])[C:12]3=[CH:11][CH:10]=2)=[CH:5][CH:4]=1.[BH4-].[Na+].[C:21]([OH:28])(=[O:27])/[CH:22]=[CH:23]/[C:24]([OH:26])=[O:25]>CO.O.C(O)C>[C:21]([OH:28])(=[O:27])/[CH:22]=[CH:23]/[C:24]([OH:26])=[O:25].[CH3:1][O:2][C:3]1[CH:8]=[CH:7][C:6]([C:9]2[N:13]3[CH2:14][CH2:15][NH:16][CH:17]([CH3:18])[C:12]3=[CH:11][CH:10]=2)=[CH:5][CH:4]=1

Participants

7

Reactant 3

HCID 444972Fumaric AcidHCID 4311764Sodium borohydrideHCID 19095368HCID 19095368, compound

Product 1

HCID 19095312HCID 19095312, compoundYield 47%

Reagents, catalysts & solvents 3

HCID 702EthanolSolventHCID 887MethanolSolventHCID 962WaterSolvent

Procedure

3,4-Dihydro-6-(p-methoxyphenyl)-1-methylpyrrolo[1,2-a]pyrazine (1.0 g) was dissolved in a mixture of 60 ml of methanol and 6 ml of water under argon. The solution was treated portionwise with 0.5 g of sodium borohydride while stirring and stirred at room temperature overnight. Thereafter, the methanol was removed in a vacuum, the residue was taken up in 100 ml of methylene chloride and washed with 45 ml of 10% ammonia solution. The phases were separated and the aqueous phase was extracted twice with 50 ml of methylene chloride each time. The organic phases were combined, dried with MgSO4 and freed from solvent. The crude product, 1.0 g of brown solid, was dissolved in a 30-fold amount of ethanol and treated with 1.1 equivalents of a saturated solution of fumaric acid in ethanol. There was obtained 0.7 g (47%) of 1,2,3,4-tetrahydro-6-(p-methoxyphenyl)-1-methylpyrrolo[1,2-a]pyrazine fumarate (1:0.9); m.pt.: 162°-165° C. (dec.).

Workup

  1. stirringstirred at room temperature overnight
  2. customThereafter, the methanol was removed in a vacuum
  3. washwashed with 45 ml of 10% ammonia solution
  4. customThe phases were separated
  5. extractionthe aqueous phase was extracted twice with 50 ml of methylene chloride each time
  6. dry with materialdried with MgSO4
  7. dissolutionThe crude product, 1.0 g of brown solid, was dissolved in a 30-fold amount of ethanol

Sources & evidence

ORD record
ord-4953451c9975411795675ebfff4d5a0c
Source dataset
uspto-grants-1994_03
Patent number
US05292732

Reaction notes

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