反应详情

Benzyl 3-(3-{1-[(tert-butoxycarbonyl)amino]ethyl}-5-chloro-2-methoxy-6-methylphenyl)azetidine-1-carboxylate (0.45 g, 0.92 mmol, from Example 170, Step 3, chiral intermediate) and was treated with 4.0 M HCl in dioxane (2 mL, 8 mmol) in methylene chloride (6 mL) at room temperature for 2 hours. The reaction mixture was then stripped to dryness to give benzyl 3-{3-[1-aminoethyl]-5-chloro-2-methoxy-6-methylphenyl}azetidine-1-carboxylate as a HCl salt. LCMS calculated for C21H26ClN2O3 (M+H)+: m/z=389.2. found: 389.1. A mixture of the above HCl salt, 6-bromo-9H-purine (0.20 g, 1.0 mmol) and DIPEA (0.80 mL, 4.6 mmol) in ethanol (9 mL) was heated at 100° C. overnight. The mixture was concentrated and purified on silica gel (eluting with 0 to 5% MeOH in dichloromethane) to give the desired product (0.25 g, 55% in 2 steps). LCMS calculated for C26H28ClN6O3 (M+H)+: m/z=507.2. found: 507.1.