Acetic Acid → 4-(2-(2-ethyl-1H-benzo[d]imidazol-1-yl)-9-methyl-8-((4-(oxetan-3-yl)piperidin-1-yl)methyl)-9H-purin-6-yl)morpholine

Participants

Reaction Steps

A mixture of 2-(2-ethylbenzoimidazol-1-yl)-9-methyl-6-morpholin-4-yl-9H-purine-8-carbaldehyde (0.105 g, 0.27 mmol), 4-oxetan-3-ylpiperidine (0.045 g, 0.32 mmol) in DCE (2 mL), trimethoxymethane (0.314 mL, 2.9 mmol) and acetic acid (0.017 mL, 0.29 mmol) was stirred for 18 h at room temperature. Sodium triacetoxyborohydride (0.101 g, 0.48 mmol) was added and the reaction mixture was stirred for 5 h at room temperature. After adding sodium triacetoxyborohydride (0.101 g, 0.48 mmol) the reaction mixture was stirred for a further 2 h and the suspension was partitioned between DCM and water. The organic layer was separated, washed with brine, dried over sodium sulphate and concentrated. The residue was purified by flash chromatography (Si—PPC, MeOH:DCM gradient 0:100 to 5:95) then (Si—PPC, acetone:EtOAc, 0:100 to 70:30) followed by reverse phase HPLC (Phenomenex Gemini 5u C18, 20 mM triethylamine in water on a gradient of acetonitrile 95:5 to 2:98) to give 314 as an off-white solid (0.048 g, 35%). LCMS (Method G): RT=5.92 min, [M+H]+ 517.3. 1H NMR (CDCl3, 400 MHz) δ 8.03-7.99 (m, 1 H); 7.78-7.74 (m, 1 H); 7.29-7.25 (m, 2 H); 4.76 (dd, J=7.9, 6.2 Hz, 2 H); 4.46 (t, J=6.2 Hz, 2 H); 4.44-4.35 (m, 4 H); 3.90-3.84 (m, 7 H); 3.78-3.73 (m, 2 H); 3.36 (q, J=7.5 Hz, 2 H); 2.95-2.91 (m, 2 H); 2.79-2.71 (m, 1 H); 2.21-2.17 (m, 2 H); 1.81-1.50 (m, 4 H); 1.49-1.41 (t, J=7.5 Hz, 3 H); 1.21-1.15 (m, 1 H)

Provenance & Evidence