tert-Butanol → Tert-butyl 2,4-hexadienyl 4-(3-nitrophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate

HRID 652427Notes

Reaction equation

HRID 652427 reaction equation
[CH2:1]([O:7][C:8]([C:10]1[CH:15]([C:16]2[CH:21]=[CH:20][CH:19]=[C:18]([N+:22]([O-:24])=[O:23])[CH:17]=2)[C:14]([C:25]([OH:27])=[O:26])=[C:13]([CH3:28])[NH:12][C:11]=1[CH3:29])=[O:9])[CH:2]=[CH:3][CH:4]=[CH:5][CH3:6].[C:30](O)([CH3:33])([CH3:32])[CH3:31].C1(N=C=NC2CCCCC2)CCCCC1>CN(C)C1C=CN=CC=1.ClC(Cl)C>[N+:22]([C:18]1[CH:17]=[C:16]([CH:15]2[C:10]([C:8]([O:7][CH2:1][CH:2]=[CH:3][CH:4]=[CH:5][CH3:6])=[O:9])=[C:11]([CH3:29])[NH:12][C:13]([CH3:28])=[C:14]2[C:25]([O:27][C:30]([CH3:33])([CH3:32])[CH3:31])=[O:26])[CH:21]=[CH:20][CH:19]=1)([O-:24])=[O:23]

Participants

6

Reactant 3

HCID 6386tert-ButanolHCID 10868DicyclohexylcarbodiimideHCID 727405614-(3-Nitrophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylic acid mono (2,4-hexadienyl) ester

Product 1

HCID 73189303Tert-butyl 2,4-hexadienyl 4-(3-nitrophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylateYield 73.1%

Reagents, catalysts & solvents 2

HCID 142844-(Dimethylamino)pyridineCatalystHCID 63651,1-DichloroethaneSolvent

Procedure

199 mg (0.5 mM) of 4-(3-nitrophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylic acid mono (2,4-hexadienyl) ester, 44 mg (0.6 mM) of tert-butanol, 113 mg (0.55 mM) of dicyclohexylcarbodiimide and 61 mg (0.5 mM) of 4-dimethylaminopyridine were dissolved in 5 ml of dichloroethane, and refluxed for 2 hours. After the reaction mixture was chilled, insoluble matters were filtered off. The solvent was evaporated under reduced pressure, and the residue was purified by silicas gel column chromatography to obtain 198 mg of a crude material. This material was recrystallized with methanol, and 166 mg of tert-butyl 2,4-hexadienyl 4-(3-nitrophenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate was obtained (yield 73%).

Workup

  1. temperaturerefluxed for 2 hours
  2. temperatureAfter the reaction mixture was chilled
  3. filtrationinsoluble matters were filtered off
  4. customThe solvent was evaporated under reduced pressure
  5. customthe residue was purified by silicas gel column chromatography
  6. customto obtain 198 mg of a crude material
  7. customThis material was recrystallized with methanol

Sources & evidence

ORD record
ord-04e3f2ab8c0246c98eb0cd575d3ba630
Source dataset
uspto-grants-1987_06
Patent number
US04672068

Reaction notes

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