[C:1]([C:3]1[CH:4]=[C:5]2[C:9](=[CH:10][CH:11]=1)[CH2:8][N:7]([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH2:6]2)#[N:2].Cl.[NH2:20][OH:21].CCN(C(C)C)C(C)C>CCO>[OH:21][NH:20][C:1]([C:3]1[CH:4]=[C:5]2[C:9](=[CH:10][CH:11]=1)[CH2:8][N:7]([C:12]([O:14][C:15]([CH3:18])([CH3:17])[CH3:16])=[O:13])[CH2:6]2)=[NH:2]A product of Step C (0.22 g; 0.904 mmol), HCl×NH2OH (0.16 g; 2.3 mmol) and DIPEA (0.48 ml; 5 mmol) in anhydrous EtOH (3.5 ml) was refluxed for 2 h under N2. The solvents were removed under reduced pressure and the residue was diluted to 30 ml with EtOAc, washed with H2O (2×5 ml), brine, dried over anhydrous MgSO4, filtered and the filtrate evaporated to dryness to give the title compound (0.25 g; 100%) as colourless foam, which was used in next step without further purification.
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