反应详情

Benzyl 4-[(1R,2S)-2-(2-hydroxyethyl)cyclopropyl]piperidine-1-carboxylate (2.24 g, 7.38 mmol) in DCM (35 ml) was added 4-bromo-2,5-difluorophenol (1.62 g, 7.75 mmol), 3.93 g of triphenylphosphine (polymer-bound, 3.0 mmol/g) and di-tert-butyl diazene-1,2-dicarboxylate (2.21 g, 9.60 mmol). The reaction mixture was stirred at ambient temperature for 4 hours. The solid was filtered off through celite and the filtrate was concentrated. The residue was purified on Biotage column (50 g SNAP silica gel) using a gradient 0-20% then 20% EtOAc in hexanes to afford the title compound as colorless viscous oil. LC/MS (m/z): 496.2 (M+H)+.

1. filtrationThe solid was filtered off through celite
2. concentrationthe filtrate was concentrated
3. customThe residue was purified on Biotage column (50 g SNAP silica gel)