Reaction #1929070

Reaction equation

triethylamine

compound

Methyl 1-amino-4,4-difluorocyclohexanecarboxylate hydrochloride

triethylamine

phosphorus oxychloride

(4′-fluoro-4-methylbiphenyl-3-yl)acetic acid

→

Methyl 4,4-difluoro-1-{[(4′-fluoro-4-methylbiphenyl-3-yl)acetyl]amino}cyclohexanecarboxylate

Solvents

tetrahydrofuran

Conditions

Workup

1. 1
   workup.WAITAfter 15 min
2. 2
   workup.STIRRINGthe mixture was stirred
3. 3
   Temperatureunder reflux for 30 min
4. 4
   ConcentrationThe mixture was concentrated under reduced pressure
5. 5
   Otherthe residue was purified by means of flash chromatography on silica gel using the mobile phase n-hexane/ethyl acetate 1:1

Procedure

2.53 g (11 mmol) of the compound from Example 4A were initially charged in 50 ml of absolute tetrahydrofuran (THF). At 20° C., 3.07 ml of triethylamine were added dropwise, the mixture was stirred for 5 min and 2.44 g (10 mmol) of (4′-fluoro-4-methylbiphenyl-3-yl)acetic acid were added. After 15 min, a further 2.3 ml of triethylamine were added, followed immediately by the dropwise addition of 0.58 ml (6.2 mmol) of phosphorus oxychloride, and the mixture was stirred under reflux for 30 min. The mixture was concentrated under reduced pressure and the residue was purified by means of flash chromatography on silica gel using the mobile phase n-hexane/ethyl acetate 1:1. This gave 2.84 g (60% of theory) of the title compound of melting point 187° C.

Source