Reaktion #945939

Reaktionsgleichung

water

3-(3-chloro-4-hydroxyphenyl)-1-cyclopentylpropan-1-one

methyl 2-chloro-2,2-difluoroacetate

K2CO3

→

material

Ausbeute 85.2%

3-[3-Chloro-4-(difluoromethoxy)phenyl]-1-cyclopentylpropan-1-one

Ausbeute 85.2%

Lösungsmittel

DMF

Reaktionsbedingungen

Aufarbeitung

1. 1
   Extraktionextracted with ethyl acetate
2. 2
   WaschenThe organic layer was washed with aqueous 1 M NaOH and brine
3. 3
   TrocknenThe organic phase was dried over Na2SO4
4. 4
   Filtrationfiltered
5. 5
   Einengenconcentrated in vacuo
6. 6
   workup.DISTILLATIONThe residue was subjected to fractional distillation

Vorschrift

A mixture of 3-(3-chloro-4-hydroxyphenyl)-1-cyclopentylpropan-1-one (15 g, 59.35 mmol, Example B(58), Step 2)), methyl 2-chloro-2,2-difluoroacetate (17.15 g, 118.7 mmol, 2 equiv) and K2CO3 (12.4 g, 124.6 mmol, 2.1 equiv) in dry DMF (150 mL) was stirred at 75–80° C. for 2 h. The mixture was poured into water and extracted with ethyl acetate. The organic layer was washed with aqueous 1 M NaOH and brine. The organic phase was dried over Na2SO4, filtered, and concentrated in vacuo. The residue was subjected to fractional distillation affording 15.3 g (72%) of material that was about 80% pure by 1H NMR (bp 70° C./2 Torr).

Quelle