Reaktion #155352

Reaktionsgleichung

methyl 5-fluoro-3-(4-methoxyphenyl)-4-oxo-8-propoxy-1,4-dihydroquinoline-2-carboxylate

sodium hydroxide

→

5-fluoro-2-hydroxymethyl-3-(4-methoxyphenyl)-8-propoxy-1H-quinolin-4-one

Ausbeute 103.3%

Lösungsmittel

dichloromethane

Reaktionsbedingungen

Aufarbeitung

1. 1
   workup.ADDITIONAfter completion of the addition
2. 2
   Extraktionfollowed by extraction with dichloromethane
3. 3
   WaschenThe thus-obtained organic layer was washed with water
4. 4
   Trocknendried over sodium sulfate
5. 5
   Einengenconcentrated under reduced pressure
6. 6
   SonstigeThe residue was purified
7. 7
   EinengenThe purified material was concentrated to dryness under reduced pressure

Vorschrift

A dichloromethane solution (30 ml) of methyl 5-fluoro-3-(4-methoxyphenyl)-4-oxo-8-propoxy-1,4-dihydroquinoline-2-carboxylate (5.0 g, 13 mmol) was cooled to −78° C., and hydrogenated diisobutylaluminium (DIBAL-H, 1M toluene solution, 30 ml) was added thereto dropwise under a nitrogen atmosphere. After completion of the addition, the mixture was stirred at the same temperature for 3 hours. The reaction mixture was heated to room temperature, and 5N sodium hydroxide was added thereto, followed by extraction with dichloromethane. The thus-obtained organic layer was washed with water, dried over sodium sulfate, and then concentrated under reduced pressure. The residue was purified using silica gel column chromatography (dichloromethane:methanol=10:1). The purified material was concentrated to dryness under reduced pressure, giving a yellow amorphous solid of 5-fluoro-2-hydroxymethyl-3-(4-methoxyphenyl)-8-propoxy-1H-quinolin-4-one (4.8 g, yield: 85%).

Quelle