Hydrochloric Acid → Diethyl 2-methyl-4-(2-thienyl)-6-formyl-1,4-dihydropyridine-3,5-dicarboxylate

HRID 894667Notes

Reaction equation

HRID 894667 reaction equation
[CH3:1][C:2]1[NH:3][C:4]([CH:23](OCC)[O:24]CC)=[C:5]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH:6]([C:13]2[S:14][CH:15]=[CH:16][CH:17]=2)[C:7]=1[C:8]([O:10][CH2:11][CH3:12])=[O:9].Cl>CC(C)=O>[CH3:1][C:2]1[NH:3][C:4]([CH:23]=[O:24])=[C:5]([C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH:6]([C:13]2[S:14][CH:15]=[CH:16][CH:17]=2)[C:7]=1[C:8]([O:10][CH2:11][CH3:12])=[O:9]

Participants

4

Reactant 2

HCID 313Hydrochloric AcidHCID 13469463Diethyl 2-methyl-4-(2-thienyl)-6-diethoxymethyl-1,4-dihydropyridine-3,5-dicarboxylate

Product 1

HCID 11245008Diethyl 2-methyl-4-(2-thienyl)-6-formyl-1,4-dihydropyridine-3,5-dicarboxylate

Reagents, catalysts & solvents 1

HCID 180AcetoneSolvent

Procedure

To a solution of diethyl 2-methyl-4-(2-thienyl)-6-diethoxymethyl-1,4-dihydropyridine-3,5-dicarboxylate (424 mg) in acetone (15 ml) was added 6N-hydrochloric acid (0.2 ml) and this solution was stirred at room temperature for an hour. The resultant solution was concentrated and the residue was extracted with diethyl ether. The extract was washed with water and dried and then the solvent was removed to give yellowish oil of diethyl 2-methyl-4-(2-thienyl)-6-formyl-1,4-dihydropyridine-3,5-dicarboxylate, which was soon crystallized. The product was recrystallized from a mixture of n-hexane and diethyl ether to give the pure product (247.7 mg), m.p. 67° to 68.5° C.

Workup

  1. concentrationThe resultant solution was concentrated
  2. extractionthe residue was extracted with diethyl ether
  3. washThe extract was washed with water
  4. customdried
  5. customthe solvent was removed

Sources & evidence

ORD record
ord-50fe220163cc4dc6b9d51ab0e75861aa
Source dataset
uspto-grants-1981_08
Patent number
US04284634

Reaction notes

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