[C:1]([C:3]1[CH:29]=[CH:28][C:6]([NH:7][CH2:8][CH2:9][CH2:10][N:11]2[CH2:17][CH:16]3[CH:18]([N:19](C)[C:20](=O)[O:21]C(C)(C)C)[CH:13]([CH2:14][CH2:15]3)[CH2:12]2)=[CH:5][CH:4]=1)#[N:2].Cl>C(OCC)(=O)C>[OH-:21].[NH4+:2].[CH3:20][NH:19][CH:18]1[CH:13]2[CH2:14][CH2:15][CH:16]1[CH2:17][N:11]([CH2:10][CH2:9][CH2:8][NH:7][C:6]1[CH:5]=[CH:4][C:3]([C:1]#[N:2])=[CH:29][CH:28]=1)[CH2:12]2A suspension of tert-butyl 3-[3-(4-cyanoanilino)propyl]-3-azabicyclo-[3.2.1]oct-8-yl(methyl)carbamate (see step (iii) above; 2.66 g, 6.67 mmol) in ethyl acetate saturated with HCl (40 mL) was stirred overnight at 25° C. under nitrogen. The mixture was partitioned with water (100 mL) and ethyl acetate (50 mL). The aqueous layer was basified with saturated sodium bicarbonate (50 mL) and then extracted with dichloromethane (3×50 mL). The organic extracts were dried (Na2SO4), filtered, concentrated in vacuo and then chromatographed on silica gel, eluting with dichloromethane:methanol:concentrated ammonium hydroxide (92:7:1), to afford 1.07 g (54%) of the title compound as a white solid.
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