反应详情

[3-Benzyloxy-4-(4-fluoro-2-hydroxy-benzoylamino)-phenyl]-carbamic acid 9H-fluoren-9-yl-methyl ester (75) (0.192 g, 0.334 mmol) was dissolved in a mixture of THF (3 mL) and DMF (1 mL). Piperidine (0.57 g, 6.68 mmol) was added. The mixture was shaken at room temperature in a Teflon septum capped vial for 20 minutes. TLC indicated complete de-protection at this point. The mixture was concentrated to give an oil. Purification by flash chromatography using a gradient of hexane and EtOAc (5–100% EtOAc in hexane for 25 minutes followed by 100% EtOAc for 5 minutes) gave the desired product (76) upon concentration (0.060 g, 0.170 mmol, 51% yield). LC-MS (ESI): (exact mass: 352.12) m/e=353.3 [M+1]+ (100%), 705.3 [2M+1]+ (5%).

1. customcapped vial for 20 minutes
2. concentrationThe mixture was concentrated
3. customto give an oil
4. customPurification by flash chromatography
5. customa gradient of hexane and EtOAc (5–100% EtOAc in hexane for 25 minutes followed by 100% EtOAc for 5 minutes)