反应详情

1,4-Difluoro-2-methyl-5-nitrobenzene (1.5 mol, 260 mg) in dimethylformamide (10 mL) was treated under argon at room temperature with 1,1-dimethylethyl 4-amino-1-piperidinecarboxylate (1.5 mmol, 300.5 mg, 1 eq) and diisopropylethylamine (1.5 mmol, 260 μL, 1 eq) then stirred at 70 (→80) ° C. for 38 h. The mixture was concentrated under vacuum, treated with water and extracted twice with ether. Organics were combined, dried on MgSO4 and concentrated under vacuum to give a red-brown residue which was chromatographed (0-25% ethyl acetate/petrol ether 6 CV) to give the title compound as a red solid (0.96 mmol, 340 mg, 64% yield). M+H=298.07, main fragment (molecule has lost its tert-butyl group).

1. concentrationThe mixture was concentrated under vacuum
2. additiontreated with water
3. extractionextracted twice with ether
4. customdried on MgSO4
5. concentrationconcentrated under vacuum
6. customto give a red-brown residue which
7. customwas chromatographed (0-25% ethyl acetate/petrol ether 6 CV)