[C:1](Cl)(=[O:5])[CH:2]([CH3:4])[CH3:3].Cl.[NH2:8][CH2:9][CH2:10][N:11]1[C:19]2[C:18]([CH3:20])=[C:17]([CH3:21])[N:16]=[C:15]([NH2:22])[C:14]=2[N:13]=[C:12]1[CH3:23].NCCN1C2C(C)=C(C)N=C(N)C=2N=C1C.C(N(CC)CC)C>ClCCl>[NH2:22][C:15]1[C:14]2[N:13]=[C:12]([CH3:23])[N:11]([CH2:10][CH2:9][NH:8][C:1](=[O:5])[CH:2]([CH3:4])[CH3:3])[C:19]=2[C:18]([CH3:20])=[C:17]([CH3:21])[N:16]=1Isobutyryl chloride (1.3 mL, 12.2 mmol) was added dropwise to a mixture of 1-(2-aminoethyl)-2,6,7-trimethyl-1H-imidazo[4,5-c]pyridin-4-amine hydrochloride (4.0 g of material from Example 24, 12.2 mmol), triethylamine (85 mL, 610 mmol) and dichloromethane (400 mL). After 15 minutes analysis by high performance liquid chromatography indicated that the reaction was complete. The solvents were removed under reduced pressure. The residue was partitioned between chloroform (250 mL) and water (250 mL) containing 10 g of sodium carbonate (pH 12). This mixture was placed in a continuous extractor and extracted with chloroform for 24 hours. The extract was dried over magnesium sulfate and then concentrated under reduced pressure to provide a light yellow oil. The oil was purified by chromatography (silica gel eluting with 85/15 dichloromethane/methanol) to provide 2.63 g of N-[2-(4-amino-2,6,7-trimethyl-1H-imidazo[4,5-c]pyridin-1-yl)ethyl]-2-methylpropanamide as a white powder, m.p. 220-222° C.
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