反应详情

A solution of tert-butyl (3R)-6-cyclohexyl-3-{3-[(methylamino)carbonyl]-1,2,4-oxadiazol-5-yl}hexanoate (Preparation 7, 380 mg, 1.00 mmol) in dichloromethane (10 ml) was treated with trifluoroacetic acid (5 ml) and the mixture was stirred at room temperature for 3.5 hours. The solvent was removed under reduced pressure and the residue azeotroped with toluene (×2). The residue was dissolved in ethyl acetate and washed sequentially with a saturated aqueous solution of sodium citrate then brine. The organic layer was dried over anhydrous sodium sulphate, filtered and the solvent removed under reduced pressure. The residue was crystallised from hexane to afford the title compound as a white solid (310 mg).

1. customThe solvent was removed under reduced pressure
2. customthe residue azeotroped with toluene (×2)
3. dissolutionThe residue was dissolved in ethyl acetate
4. washwashed sequentially with a saturated aqueous solution of sodium citrate
5. dry with materialThe organic layer was dried over anhydrous sodium sulphate
6. filtrationfiltered
7. customthe solvent removed under reduced pressure
8. customThe residue was crystallised from hexane