反应详情

To a stirred solution of the 3-(1-phenylcyclohexyl)propanoic acid (0.118 g, 0.508 mmol) and the (Z)-tert-butyl 1-(4-(N′-hydroxycarbamimidoyl)benzyl)azetidine-3-carboxylate (Intermediate 1, 0.155 g, 0.508 mmol) in acetonitrile (5.0 mL) at room temperature was added the 1,3-diisopropylcarbodiimide (0.095 mL, 0.609 mmol). The stirring was continued at room temperature and followed by LC/MS. After 90 min., TBAF (0.609 mL, 0.609 mmol) was added to the reaction. The reaction was found to be over after 2 h. The reaction mixture was diluted with EtOAc and washed with water followed by brine. It was then concentrated and purified by preparative HPLC to give the tert-butyl 1-(4-(5-(2-(1-phenylcyclohexyl)ethyl)-1,2,4-oxadiazol-3-yl)benzyl)azetidine-3-carboxylate as a glassy solid. LCMS of the tert-butyl 1-(4-(5-(2-(1-phenylcyclohexyl)ethyl)-1,2,4-oxadiazol-3-yl)benzyl)azetidine-3-carboxylate (Conditions: Start % B═O; Final % B=100; Gradient Time=2 min; Flow Rate=5 ml/min; Wavelength=220; Solvent A=10% MeOH—90% H20—0.1% TFA; Solvent B=90% MeOH—10% H2O—0.1% TFA and Column 4=Phenomenex Luna 5u C18 4.6×30 mm (2 min. grad)) (M+H)+=502.39. Retention time=1.927.

1. customwas continued at room temperature
2. customafter 2 h
3. washwashed with water
4. concentrationIt was then concentrated
5. custompurified by preparative HPLC