3-Hydroxy-1-naphthoic acid → 4-Amino-3-hydroxynaphthalene-1-carboxylic acid

HRID 434024

Reaktionsgleichung

S([O-])(=O)(C1C=CC([NH2:9])=CC=1)=O.[Na+].N([O-])=O.[Na+].[OH:17][C:18]1[CH:19]=[C:20]([C:28]([OH:30])=[O:29])[C:21]2[C:26]([CH:27]=1)=[CH:25][CH:24]=[CH:23][CH:22]=2.C(=O)(O)[O-].[Na+].S([O-])(O)=O.[Na+]>O>[NH2:9][C:27]1[C:26]2[C:21](=[CH:22][CH:23]=[CH:24][CH:25]=2)[C:20]([C:28]([OH:30])=[O:29])=[CH:19][C:18]=1[OH:17]

Komponenten

Reaktionsbedingungen

Temperatur: 60 °C

Versuchsvorschrift

To a stirred solution of p-benzenediazonium sulfonate, which was prepared by the addition of sodium sulfanilate (0.525 g, 2.7 mmole) to sodium nitrite at 0°, and the compound from example 14 c) (0.413 g, 2.2 mmol) in water (20 mL), sodium bicarbonate (2.3 g, 27.0 mmol) was added slowly. The resulting solution was heated at 60° C. with stirring overnight. After the solution was cooled to 50° C., sodium hydrogen sulfite (1.05 g, 6.0 mmole) was added. The resulting solution was stirred for 30 min. at 50° C. After cooling down to room temperature, the solid was removed by filtration. The filtrate was evaporated to dryness and the residue was purified by flash chromatography (silica gel, 45% dichloromethane/45% ethyl acetate/10% methanol) to give the title compound (0.066 g, 15%) MS(ES) m/z 203.8 [M+H].

Aufarbeitung

temperatureAfter the solution was cooled to 50° C.
stirringThe resulting solution was stirred for 30 min. at 50° C
temperatureAfter cooling down to room temperature
customthe solid was removed by filtration
customThe filtrate was evaporated to dryness
customthe residue was purified by flash chromatography (silica gel, 45% dichloromethane/45% ethyl acetate/10% methanol)

Quellen und Nachweise

ORD-Eintrag: ord-ec1c764de9924c6192c403951b9f64e1
Quelldatensatz: uspto-grants-2003_12
DOI: 10.6084/m9.figshare.5104873.v1
Patentnummer: US06670387B1

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