N[C:2]1[C:6]([C:7]([O:9][CH2:10][CH3:11])=[O:8])=[CH:5][N:4]([C:12]2[CH:17]=[CH:16][CH:15]=[C:14]([Br:18])[CH:13]=2)[N:3]=1.C(ON=O)CC(C)C>C1COCC1>[CH2:10]([O:9][C:7]([C:6]1[CH:2]=[N:3][N:4]([C:12]2[CH:17]=[CH:16][CH:15]=[C:14]([Br:18])[CH:13]=2)[CH:5]=1)=[O:8])[CH3:11]To a solution of the ester from Step 1 (0.5 g, 1.61 mmol) in THF (4.3 mL) was added isoamylnitrite (0.434 mL, 3.23 mmol), and the mixture was refluxed for 16 hours. It was cooled to room temperature, concentrated, dried and used as such for the subsequent step without any purification.
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