C([O:8][C:9]1[CH:10]=[CH:11][C:12]2[C:13]3[S:22][C:21]([CH2:23][CH2:24][CH3:25])=[N:20][C:14]=3[C:15]([NH2:19])=[N:16][C:17]=2[CH:18]=1)C1C=CC=CC=1.Br.[OH-].[Na+]>C(O)(=O)C>[OH:8][C:9]1[CH:10]=[CH:11][C:12]2[C:13]3[S:22][C:21]([CH2:23][CH2:24][CH3:25])=[N:20][C:14]=3[C:15]([NH2:19])=[N:16][C:17]=2[CH:18]=1To 7-benzyloxy-2-propylthiazolo[4,5-c]quinolin-4-amine (prepared as described in Example 1, 1.59 g, 4.55 mmol) was added a 30 wt. % solution of hydrogen bromide in acetic acid (25 mL). The resulting solution was heated at 65° C. for 1 h, then cooled in an ice bath. Aqueous NaOH (50% w/w solution) was added slowly until the pH=7 and a light yellow solid formed. The solid was isolated by filtration, dried, and purified by HPFC (silica gel eluting sequentially with 0-10% of a solution comprised of 80% CHCl3, 18% MeOH, and 2% conc. NH4OH (CMA) in chloroform, then 10-35% CMA in chloroform). The appropriate fractions were concentrated to a light yellow solid that was crystallized from toluene containing a small amount of methanol. The light yellow solid was isolated by filtration, washed with cold toluene, and dried at 60° C. in a vacuum oven to provide the acetic acid salt of 7-hydroxy-2-propylthiazolo[4,5-c]quinolin-4-amine (0.64 g, 54%), mp 236-239° C. 1H NMR (300 MHz, d6-DMSO) δ 9.72 (s, 1H), 7.58 (d, J=8.8 Hz, 1H), 6.91 (d, J=2.2 Hz, 1H), 6.78 (dd, J=8.7, 2.2 Hz, 1H), 6.70 (s, 2H), 3.12 (t, J=7.8 Hz, 2H), 1.83 (sextet, J=7.2 Hz, 2H), 0.99 (t, J=7.5 Hz, 3H); 13C NMR (75 MHz, d6-DMSO) δ 168.4, 158.1, 152.2, 146.6, 139.6, 135.6, 125.7, 113.3, 112.2, 108.9, 35.0, 22.8, 13.4; Anal. calcd for C13H13N3OS.0.22C2H4O2: C, 59.23; H, 5.13; N, 15.42. Found: C, 59.42; H, 5.00; N, 15.41.
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