4-(2-Methylpiperidin-1-yl)-3-nitrobenzoic acid → Methyl 2-fluoro-4-{5-[4-(2-methylpiperidin-1-yl)-3-nitrophenyl]-1,2,4-oxadiazol-3-yl}benzoate

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반응 단계

Intermediate 11 (12.46 g; 47.13 mmol) was dissolved in DCM (200 mL) and n,n′-dicyclohexylcarbodiimide (11.67 g; 56.56 mmol) was added. Then Intermediate 1 was added (10 g; 47.13 mmol) and the suspension was stirred at RT for 12 hours. The precipitate was filtered off and the solvent evaporated to give a yellow solid. The residue was dissolved in Toluene (300 mL) and Py (150 mL) and the solution was heated to 130° C. for 12 hours. The reaction mixture was concentrated to afford a yellow sticky oil which was precipitated from ACN affording the title compound as a yellow solid. LC/MS (Method B): 441.3 (M+H)+ HPLC: Rt 5.86 min (Purity: 95.1%).

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