Water → (3R,4S)-4-azido-1-(3-nitro-5-(4H-1,2,4-triazol-4-yl)phenyl)piperidin-3-ol

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Reaction Conditions

Reaction Steps

A mixture of 4-(3-fluoro-5-nitrophenyl)-4H-1,2,4-triazole (200 mg, 0.96 mmol), 4-azidopiperidin-3-ol (164 mg, 1.15 mmol) and K2CO3 (199 mg, 1.44 mmol) in DMSO was heated at 100° C. for 4 hours. The reaction mixture was poured into water and extracted with EtOAc (two times). The combined extracts were washed with water and brine, dried over MgSO4, filtered and concentrated. The crude material was purified by flash chromatography, (SiO2, 24 g column, 0-12% MeOH/DCM) to give Intermediate 33A (135 mg, 43%) as a yellow solid. HPLC: Rt=1.722 min. (CHROMOLITH® column 4.6×50 mm eluting with 10-90% aqueous methanol over 4 min. containing 0.1% TFA, 4 mL/min., monitoring at 220 nm). MS (ES): m/z=331 [M+H]+.

Provenance & Evidence