Water → HCID 54504306, compound

HRID 1164578Notes

Reaction equation

HRID 1164578 reaction equation
[N+:1]([C:4]1[CH:11]=[CH:10][CH:9]=[CH:8][C:5]=1[CH:6]=O)([O-:3])=[O:2].[CH2:12]([O:14][CH:15]([O:24][CH2:25][CH3:26])[C:16](=[O:23])[CH2:17][C:18]([O:20][CH2:21][CH3:22])=[O:19])[CH3:13].N1CCCCC1.O>C1C=CC=CC=1>[N+:1]([C:4]1[CH:11]=[CH:10][CH:9]=[CH:8][C:5]=1[CH:6]=[C:17]([C:16]([CH:15]([O:14][CH2:12][CH3:13])[O:24][CH2:25][CH3:26])=[O:23])[C:18]([O:20][CH2:21][CH3:22])=[O:19])([O-:3])=[O:2]

Participants

6

Reactant 4

HCID 962WaterHCID 8082PiperidineHCID 111012-NitrobenzaldehydeHCID 11138577Ethyl 4,4-diethoxy-3-oxobutanoate

Product 1

HCID 54504306HCID 54504306, compound

Reagents, catalysts & solvents 1

HCID 241BenzeneSolvent

Procedure

(4)-(1) A solution of 2-nitrobenzaldehyde (9.0672 g), ethyl 4,4-diethoxyacetoacetate (13.0944 g) and piperidine (1 ml) in benzene (45 ml) was refluxed under azeotropic dehydration for 3 hours. To the resultant solution was added water, and the solution was extracted with diethyl ether. The extract was washed three times with water, dried and then the solvent was removed under reduced pressure to give ethyl 2-(2-nitrobenzylidene)-4,4-diethoxyacetoacetate. The mixture of the compound obtained above and ethyl 3-aminocrotonate (7.7496 g) was heated in an oil bath (95° to 100° C.) for 8 hours. The resultant mixture was extracted with diethyl ether, and the extract was washed with water and dried. The solvent was removed from the extract. The residue was purified by column chromatography on silica gel with an eluent (benzene: ethyl acetate=20:1) to give oily diethyl 2-methyl-4-(2-nitrophenyl)-6-diethoxymethyl-1,4-dihydropyridine-3,5-dicarboxylate (19.3 g). The product was crystallized in n-hexane and the crystals were collected by filtration and then recrystallized from a mixture of n-hexane and diethyl ether to give the pure compound, m.p. 80° to 81.5° C.

Workup

  1. extractionthe solution was extracted with diethyl ether
  2. washThe extract was washed three times with water
  3. customdried
  4. customthe solvent was removed under reduced pressure

Sources & evidence

ORD record
ord-26bfffb2817440af96e10d4eb1936b48
Source dataset
uspto-grants-1983_01
Patent number
US04370334

Reaction notes

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