Acetic Acid → HCID 178461902, compound

Participants

Reaction Steps

To a mixture of (S)—N-(1-(1-(piperidin-4-yl)-1H-benzo[d]imidazol-2-yl)ethyl)-9H-purin-6-amine from Example 113 (99 mg, 0.273 mmol) in anhydrous DCE (10 mL) was added oxetan-3-one (32 μL, 0.546 mmol) followed by AcOH (16 μL, 0.273 mmol) and 4 Å (angstrom) powdered molecular sieves (0.1 g). After stirring for 4 h, sodium triacetoxyborohydride (116 mg, 0.546 mmol) was added and stirring was continued for 48 h. The crude reaction mixture was loaded into an Isolute® SCX-2 which was washed with MeOH and the product eluted with 2M NH3/MeOH. The product containing fractions were combined and concentrated in vacuo and the resulting residue was purified by column chromatography (Si—PCC, gradient 0-10% 2M NH3/MeOH in DCM) and then triturated with diethyl ether and MeOH affording 129 as a white solid (50 mg, 44%). LCMS: RT 1.61 min [M+H]+ 419.1. 1H NMR (DMSO, 400 MHz, 80° C.): δ 8.25 (1H, s), 8.05 (1H, s), 7.65-7.59 (2H, m), 7.44 (1H, bs), 7.20-7.13 (2H, m), 6.16-6.04 (1H, m), 4.63-4.39 (6H, m), 3.50-3.42 (1H, m), 2.93-2.85 (1H, bd, J=10.45 Hz), 2.76-2.69 (1H, bd, J=10.45 Hz), 2.40-2.28 (1H, m), 2.04-1.93 (1H, t, J=11.60 Hz), 1.90-1.81 (1H, m), 1.76-1.53 (6H, m)

Provenance & Evidence