Hydroxyamine hydrochloride → Dimethyl 2-methyl-4-(2-nitrophenyl)-6-hydroxyiminomethyl-1,4-dihydropyridine-3,5-dicarboxylate

HRID 894719Notizen

Reaktionsgleichung

Reaktionsgleichung von HRID 894719
[CH3:1][C:2]1[NH:3][C:4]([CH:25]=O)=[C:5]([C:21]([O:23][CH3:24])=[O:22])[CH:6]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2[N+:18]([O-:20])=[O:19])[C:7]=1[C:8]([O:10][CH3:11])=[O:9].Cl.[NH2:28][OH:29].C([O-])(=O)C.[Na+]>C(O)(=O)C>[CH3:1][C:2]1[NH:3][C:4]([CH:25]=[N:28][OH:29])=[C:5]([C:21]([O:23][CH3:24])=[O:22])[CH:6]([C:12]2[CH:17]=[CH:16][CH:15]=[CH:14][C:13]=2[N+:18]([O-:20])=[O:19])[C:7]=1[C:8]([O:10][CH3:11])=[O:9]

Komponenten

5

Edukt 3

HCID 443297Hydroxyamine hydrochlorideHCID 517045Sodium AcetateHCID 15737325Dimethyl 2-methyl-4-(2-nitrophenyl)-6-formyl-1,4-dihydropyridine-3,5-dicarboxylate

Produkt 1

HCID 86737954Dimethyl 2-methyl-4-(2-nitrophenyl)-6-hydroxyiminomethyl-1,4-dihydropyridine-3,5-dicarboxylate

Reagenzien, Katalysatoren, Lösungsmittel 1

HCID 176Acetic AcidLösungsmittel

Versuchsvorschrift

A mixture of dimethyl 2-methyl-4-(2-nitrophenyl)-6-formyl-1,4-dihydropyridine-3,5-dicarboxylate (3.6 g), hydroxylamine hydrochloride (764 mg) and sodium acetate (1.06 g) in acetic acid (20 ml) was stirred at room temperature for 45 minutes to form dimethyl 2-methyl-4-(2-nitrophenyl)-6-hydroxyiminomethyl-1,4-dihydropyridine-3,5-dicarboxylate. To the reaction mixture was added acetic anhydride (3.37 g) and the mixture was stirred at room temperature for 15 minutes and then heated at 100° C. for 3 hours with stirring. After removal of the acetic acid, the residue was adjusted to pH 7.5 with an aqueous sodium bicarbonate solution and extracted with ethyl acetate. The extract was washed twice with water and saturated aqueous sodium chloride solution, dried over magnesium sulfate and evaporated to dryness under reduced pressure. The resultant oil (3.80 g) was chromatographed on a column of silica-gel (110 g) and eluted with a mixture of benzene and ethyl acetate (9:1, v/v) to give crystals (2.05 g), which were recrystallized from a mixture of ethyl acetate (12 ml) and n-hexane (6 ml) to give yellow granules of dimethyl 2-methyl-4-(2-nitrophenyl)-6-cyano-1,4-dihydropyridine-3,5-dicarboxylate (1.19 g), mp 170.5° to 171.5° C.

Quellen und Nachweise

ORD-Eintrag
ord-0a41981b10db48d080068b2968ad84b3
Quelldatensatz
uspto-grants-1981_08
Patentnummer
US04284634

Notizen zur Reaktion

Wird geladen…