Diisopropylethylamine → 1-Cyclopentyl-5-(3-difluoromethyl-phenyl)-6-methyl-4-oxo-1,4-dihydro-pyridine-3-carboxylic acid (5-methyl-[1,3,4]oxadiazol-2-ylmethyl)-amide

Participants

Reaction Steps

A solution of 1-cyclopentyl-5-(3-difluoromethyl-phenyl)-6-methyl-4-oxo-1,4-dihydro-pyridine-3-carboxylic acid (preparation 9, 116 mg, 0.334 mmol), HBTU (140 mg, 0.369 mmol), DIPEA (116 μL, 0.668 mmol) in DMF (1 mL) is stirred for 15 min at room temperature. C-(5-methyl-1,3,4-oxadiazol-2-yl)-methylamine (46 mg, 0.407 mmol) is added and the reaction mixture is stirred for 72 h at room temperature. The reaction mixture is purified by preparative reversed-phase HPLC (XBridge, gradient of methanol in water, 0.3% NH4OH, 60° C.). Yield: 67 mg (45% of theory); ESI mass spectrum: [M+H]+=443; Retention time HPLC: 0.98 min (Z003_001).

Provenance & Evidence