2-amino-5-fluoro-4-methylphenol

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Polymer supported sodium cyanoborohydride (794 mg, 3.41 mmol) was added to a solution of commercially available 2-amino-5-fluoro-4-methylphenol (241 mg, 1.71 mmol), 1,1-dimethylethyl 4-oxo-1-piperidinecarboxylate (350 mg, 1.76 mmol) and acetic acid (0.489 mL, 8.53 mmol) in dichloromethane (10 mL). The mixture was heated by microwave at 100° C. for 30 min before being filtered and concentrated by rotary evaporation to give a green oil. The residue was purified via chromatography (silica, dichloromethane to 0.5% ammonia/9.5% methanol/90% dichloromethane) to give 1,1-dimethylethyl 4-[(4-fluoro-2-hydroxy-5-methylphenyl)amino]-1-piperidinecarboxylate (593 mg, 73% purity, 78% yield) as a brown oil. before being filtered concentrated by rotary evaporation to give a green oil The residue was purified via chromatography (silica, dichloromethane to 0.5% ammonia/9.5% methanol/90% dichloromethane)

Conditions: temp:0.00; pressure:0.00; stir: