Diisopropylethylamine → tert-butyl 3-[3-chloro-6-methoxy-2-methyl-5-(1-{[9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl]amino}ethyl)phenyl]azetidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A mixture of tert-butyl 3-[3-(1-aminoethyl)-5-chloro-2-methoxy-6-methylphenyl]azetidine-1-carboxylate (0.36 g, 1.0 mmol), 6-bromo-9-(tetrahydro-2H-pyran-2-yl)-9H-purine (0.43 g, 1.5 mmol, from Example 108, Step 1) and DIPEA (0.53 mL, 3.0 mmol) in ethanol (6 mL) was heated at 100° C. overnight. The mixture was concentrated and purified on silica gel column (eluting with 0 to 100% EtOAc in hexanes) to give tert-butyl 3-[3-chloro-6-methoxy-2-methyl-5-(1-{[9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl]amino}ethyl)phenyl]azetidine-1-carboxylate. LCMS calculated for C28H38 ClN6O4 (M+H)+: m/z=557.3. found: 557.3. The Boc intermediate isolated was treated with trifluoroacetic acid (0.8 mL, 10 mmol) in methylene chloride (5 mL) at room temperature for 1 hour. The mixture was stripped to dryness to give the desired product as TFA salt. 4 mg of the salt was 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 C18H22ClN6O (M+H)+: m/z=373.2. found: 373.1

Provenance & Evidence