Hydrochloric Acid → Dimethyl 4-[2-[4-(methanesulfonylamino)butoxy]-5-nitrophenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate

HRID 2231378Notes

Reaction equation

HRID 2231378 reaction equation
[NH2:1][CH2:2][CH2:3][CH2:4][CH2:5][O:6][C:7]1[CH:12]=[CH:11][C:10]([N+:13]([O-:15])=[O:14])=[CH:9][C:8]=1[CH:16]1[C:21]([C:22]([O:24][CH3:25])=[O:23])=[C:20]([CH3:26])[NH:19][C:18]([CH3:27])=[C:17]1[C:28]([O:30][CH3:31])=[O:29].C(N(CC)CC)C.[CH3:39][S:40](Cl)(=[O:42])=[O:41].Cl>C(Cl)Cl.C(OCC)(=O)C>[CH3:39][S:40]([NH:1][CH2:2][CH2:3][CH2:4][CH2:5][O:6][C:7]1[CH:12]=[CH:11][C:10]([N+:13]([O-:15])=[O:14])=[CH:9][C:8]=1[CH:16]1[C:21]([C:22]([O:24][CH3:25])=[O:23])=[C:20]([CH3:26])[NH:19][C:18]([CH3:27])=[C:17]1[C:28]([O:30][CH3:31])=[O:29])(=[O:42])=[O:41]

Participants

7

Reactant 4

HCID 313Hydrochloric AcidHCID 8471TriethylamineHCID 31297Methanesulfonyl chlorideHCID 14306630Dimethyl 4-[2-(4-aminobutoxy)-5-nitrophenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate

Product 1

HCID 14306641Dimethyl 4-[2-[4-(methanesulfonylamino)butoxy]-5-nitrophenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate

Reagents, catalysts & solvents 2

HCID 6344DichloromethaneSolventHCID 8857Ethyl AcetateSolvent

Procedure

In 4 ml of methylene chloride was dissolved 0.43 g of dimethyl 4-[2-(4-aminobutoxy)-5-nitrophenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate. After 0.138 ml of triethylamine and 0.077 ml of methanesulfonyl chloride were added to the solution under ice cooling, the mixture was stirred for 3 days at room temperature. To the reaction solution were added 50 ml of ethyl acetate and 20 ml of 2N hydrochloride to fractionate the organic phase. The solvent was removed by distillation under reduced pressure. The obtained residue was subjected to silica gel column chromatography and eluted by chloroform:methanol (9:1 v/v). The obtained crude crystals were recrystallized from chloroform-n-hexane to give 0.31 g of dimethyl 4-[2-[4-(methanesulfonylamino)butoxy]-5-nitrophenyl]-2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylate. This compound has the following physicochemical properties.

Workup

  1. customThe solvent was removed by distillation under reduced pressure
  2. washeluted by chloroform:methanol (9:1 v/v)
  3. customThe obtained crude crystals
  4. customwere recrystallized from chloroform-n-hexane

Sources & evidence

ORD record
ord-e758041c4dee477e9fe18f7416342e87
Source dataset
uspto-grants-1988_11
Patent number
US04782160

Reaction notes

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