Morpholine → Methyl 5-morpholino-2-nitrobenzoate

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Cl[C:2]1[CH:3]=[CH:4][C:5]([N+:12]([O-:14])=[O:13])=[C:6]([CH:11]=1)[C:7]([O:9][CH3:10])=[O:8].[NH:15]1[CH2:20][CH2:19][O:18][CH2:17][CH2:16]1>CN(C=O)C.CO>[N:15]1([C:2]2[CH:3]=[CH:4][C:5]([N+:12]([O-:14])=[O:13])=[C:6]([CH:11]=2)[C:7]([O:9][CH3:10])=[O:8])[CH2:20][CH2:19][O:18][CH2:17][CH2:16]1

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실험 절차

A solution of 2.0 g (9.28 mmol) product from Step A and 1.6 mL (18.6 mmol) morpholine in 20 mL DMF was heated to 90° C. for 6 hours. After the mixture had cooled to room temperature, the DMF was stripped off in vacuo. The crude material was then redissolved in methanol and stirred with 20 g Amberlyst-A26® for about 20 minutes. The mixture was then stripped of solvent and used without further purification in the next step. Rf 0.20 in 40% EtOAc/hexane, visualized by UV and visible light.