Methanol → (3S)-tert-butyl 4-((1R)-1-(6-fluoro-5-(2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl)pyridin-3-yl)ethyl)-3-methylpiperazine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

A glass microwave reaction vessel was charged with 6-chloro-2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purine (0.200 g, 0.791 mmol) and 5-((R)-1-((S)-4-(tert-butoxycarbonyl)-2-methylpiperazin-1-yl)ethyl)-2-fluoropyridin-3-ylboronic acid (0.407 g, 1.108 mmol) in dioxane (3 mL). Then A-Phos (0.056 g, 0.079 mmol), potassium acetate (0.233 g, 2.374 mmol) and water (0.5 mL) was added into the reaction mixture. The reaction mixture was stirred and heated in a CEM Explorer Microwave at 120° C. for 10 min (120 watts, Powermax feature on). The mixture was diluted with dichloromethane (10 mL), water (10 mL) and brine solution (5 mL). The organic layer was collected by extracting with dichloromethane (3×10 mL). The combined organic extracts were dried over sodium sulfate, filtered and concentrated in vacuo to give the crude material as tan oil. The crude material was adsorbed onto silica gel and purified by chromatography through a silica-gel column (40 g) eluting with 100% ethyl acetate, then with 10% methanol in dichloromethane to give (3S)-tert-butyl 4-((1R)-1-(6-fluoro-5-(2-methyl-9-(tetrahydro-2H-pyran-2-yl)-9H-purin-6-yl)pyridin-3-yl)ethyl)-3-methylpiperazine-1-carboxylate (0.342 g, 0.634 mmol, 80% yield) as a tan solid. 1H NMR (400 MHz, CDCl3) δ 8.26-8.35 (m, 3H) 5.86 (dd, J=10.37, 2.35 Hz, 1H) 4.19 (d, J=11.74 Hz, 2H) 3.83 (d, J=2.54 Hz, 1H) 2.89 (s, 3H) 2.54 (d, J=2.93 Hz, 2H) 2.16 (s, 1H) 2.11 (s, 1H) 2.07 (d, J=17.80 Hz, 1H) 1.81 (d, J=11.54 Hz, 2H) 1.59-1.75 (m, 3H) 1.39-1.49 (m, 15H) 1.02 (d, J=5.67 Hz, 3H). m/z (ESI, +ve ion) 540.2 (M+H).

Provenance & Evidence