[CH3:1][NH:2][C:3]([C:5]1[N:6]=[CH:7][C:8]([O:11][C:12]2[CH:29]=[CH:28][C:15]3[CH2:16][CH2:17][N:18](C(OC(C)(C)C)=O)[CH2:19][CH2:20][C:14]=3[CH:13]=2)=[N:9][CH:10]=1)=[O:4].Cl.O1CCOCC1>ClCCl>[CH3:1][NH:2][C:3]([C:5]1[CH:10]=[N:9][C:8]([O:11][C:12]2[CH:29]=[CH:28][C:15]3[CH2:16][CH2:17][NH:18][CH2:19][CH2:20][C:14]=3[CH:13]=2)=[CH:7][N:6]=1)=[O:4]
A solution of 1,1-dimethylethyl 7-({5-[(methylamino)carbonyl]-2-pyrazinyl}oxy)-1,2,4,5-tetrahydro-3H-3-benzazepine-3-carboxylate (D49, Step 3) (44.26 g, 0.11 mol) in dichloromethane (800 ml) was added dropwise to a stirring solution of 4M hydrogen chloride in dioxane (270 ml, 1.1 mol). The resulting mixture was stirred at room temperature for 60 minutes. A further quantity of 4M hydrogen chloride in dioxane (30 ml, 0.12 mol) was added and the mixture stirred for 60 minutes. The resulting white solid was collected by filtration and washed with dichloromethane. The solid was dissolved in water (2 L) and basified by addition of saturated sodium carbonate solution. The water layer was extracted with dichloromethane and the extracts filtered through celite. The celite was washed with methanol and the combined dichloromethane and methanol washings were evaporated in vacuo to give the title compound (25.1 g); MS (ES+) m/e 299 [M+H]+.
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