ethyl (4E)-3-methyl-5-[4-(trifluoromethyl)phenyl]-2,4-pentadienoate → (2E,4E)-3-Methyl-5-[4-(trifluoromethyl)phenyl]-2,4-pentadien-1-ol

After a solution in which 150 mg (0.53 mmol) of ethyl (4E)-3-methyl-5-[4-(trifluoromethyl)phenyl]-2,4-pentadienoate ((2E)/(2Z)=5/1) as described in Reference example 8 were dissolved in 2 ml of toluene was stirred at 0° C., 0.7 ml (1.06 mmol) of a 1.5M diisobutyl aluminum hydride-toluene solution were added to the solution. After 20 minutes, ice-water was added to the reaction mixture and the mixture was stirred for 10 minutes. The insolubles were removed by filtration using Celite and the filtrate was extracted with ethyl acetate and dried, followed by evaporation of the solvent to obtain an oil. The oil was subjected to column chromatography using 5 g of silica gel and eluted with a mixed solvent of 30 to 40% ethyl acetate-hexane to obtain 90 mg of the title compound as an oil.

1. stirringthe mixture was stirred for 10 minutes
2. customThe insolubles were removed by filtration
3. extractionthe filtrate was extracted with ethyl acetate
4. customdried
5. customfollowed by evaporation of the solvent
6. customto obtain an oil
7. washeluted with a mixed solvent of 30 to 40% ethyl acetate-hexane

ORD-Eintrag

ord-122227432ab94931b5296799bff98018

Quelldatensatz

uspto-grants-1999_11

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US05977152