Diisopropylethylamine → HCID 86666864, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of tert-butyl 3-[3-(1-aminoethyl)-5-chloro-6-fluoro-2-methoxyphenyl]azetidine-1-carboxylate (22.5 mg, 0.0627 mmol), 6-bromo-9-(tetrahydro-2H-pyran-2-yl)-9H-purine (24 mg, 0.085 mmol, from Example 108, Step 1) and DIPEA (33 μL, 0.19 mmol) in ethanol (1.0 mL) was heated at 100° C. overnight. The mixture was diluted with sat. NaHCO3 solution, extracted with dichloromethane. The combined organic layers were dried over MgSO4 and concentrated to give tert-butyl 3-[3-chloro-2-fluoro-6-methoxy-5-(1-{[9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl]amino}ethyl)phenyl]azetidine-1-carboxylate (34 mg). LCMS calculated for C27H35ClFN6O4 (M+H)+: m/z=561.2. found: 561.2. The coupling product made above was treated with 4.0 M HCl in dioxane (0.5 mL, 2 mmol) in methylene chloride (0.2 mL) at room temperature for 1 hour. The reaction mixture was then evaporated to dryness to give N-[1-(3-azetidin-3-yl-5-chloro-4-fluoro-2-methoxyphenyl)ethyl]-9H-purin-6-amine dihydrochloride. The resultant HCl salt was dissolved in methanol (0.2 mL)/acetonitrile (0.2 mL)/THF (0.2 mL) and treated with DIPEA (0.1 mL, 0.6 mmol) until the solid dissolved. Acetone (0.05 mL, 0.6 mmol) was added and the resulting mixture was stirred at room temperature for 30 min before the addition of sodium triacetoxyborohydride (0.066 g, 0.31 mmol). The reaction mixture was stirred at room temperature for 4 h and then purified on prep-LCMS (XBridge C18 Column, eluting with a gradient of acetonitrile in water with 0.05% trifluoroacetic acid, at flow rate of 30 mL/min) to afford the desired product as TFA salt. LCMS calculated for C23H25ClFN6O (M+11)+: m/z=419.2. found: 419.1. 1H NMR (300 MHz, DMSO-d6) δ 9.96 (1H, m), 8.41 (1H, m), 8.23 (1H, s), 8.20 (1H, s), 7.53 (1H, s), 5.69 (1H, m), 4.52 (2H, m), 4.26 (1H, m), 4.12 (2H, m), 3.77 (3H, s), 2.08 (3H, m), 1.46 (3H, d, J=6.9 Hz), 1.11 (6H, m) ppm.

Provenance & Evidence