Acetic Acid → 2-(1-((5-(2-methyl-1H-benzo[d]imidazol-1-yl)-7-morpholinothiazolo[5,4-d]pyrimidin-2-yl)methyl)piperidin-3-yl)propan-2-ol

Participants

Reaction Steps

A mixture of 5-(2-methylbenzoimidazol-1-yl)-7-morpholin-4-yl-thiazolo[5,4-d]pyrimidine-2-carbaldehyde (78 mg, 0.2 mmol), 2-piperidin-3-yl-propan-2-ol (43 mg, 0.3 mmol) trimethyl orthoformate (0.109 mL, 1.0 mmol) and glacial acetic acid (0.017 mL, 0.3 mmol) in 1,2-dichloroethane (2 mL) was stirred at RT under nitrogen atmosphere for 1 h. Sodium triacetoxyborohydride (85 mg, 0.4 mmol) was added and the resulting reaction mixture was stirred at RT for 16 h. The solvent was reduced in vacuo and the residue was loaded onto an Isolute® SCX-2 cartridge (10 g). The cartridge was washed with DCM/MeOH, the desired product was subsequently eluted using a mixture of 2M NH3 in MeOH and DCM. The residue was purified by column chromatography (Si—PCC, acetone:cyclohexane: 10:90 to 35:65 by volume). Solvents were reduced in vacuo to afford the title compound as a white solid. The resulting solid was further purified by reverse phase HPLC (MeOH: H2O+0.1% HCCOH, gradient 10:90 to 90:10 over 25 min). The solvent was reduced in vacuo and the aqueous residue freeze dried to afford 362 as a white solid (23 mg, 23%). LCMS (Method G): RT 6.73 min, [M+H]+ 508. 1H NMR (400 MHz, CDCl3): δ 8.18 (1 H, s), 8.04-8.03 (1 H, m), 7.70-7.69 (1 H, m), 7.27-7.26 (2 H, m), 4.38 (4 H, br s), 3.90 (2 H, s), 3.85 (4 H, t, J=4.74 Hz), 3.18 (2 H, m), 2.91 (5 H, m), 2.28-2.15 (2 H, m), 1.81 (2 H, m), 1.75-1.60 (2 H, m), 1.20 (3 H, s), 1.15 (3 H, s)

Provenance & Evidence