Diisopropylcarbodiimide → 4-({2-[5-Chloro-4-(5-chloro-2-cyanophenyl)-2-oxopyridin-1(2H)-yl]propanoyl}amino)-2-fluorobenzoic acid

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Under argon and at RT, 37 mg (0.30 mmol, 1.0 eq.) of N,N′-diisopropylcarbodiimide were added to a solution of 100 mg (0.30 mmol) of 2-[5-chloro-4-(5-chloro-2-cyanophenyl)-2-oxopyridin-1(2H)-yl]propanoic acid (racemate) (Example 12.1D) in 2 ml of dichloroethane, the mixture was stirred for 10 min, 46 mg (0.30 mmol) of 4-amino-2-fluorobenzoic acid were added and the mixture was stirred under reflux overnight. Subsequently, the reaction mixture was concentrated under reduced pressure and the crude product was purified by preparative HPLC (Reprosil C18, water/methanol gradient). Yield: 41 mg (29% of theory)

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