Sodium triacetoxyborohydride → 4-(2-((2,2-dimethyl-4-(oxetan-3-yl)piperazin-1-yl)methyl)-5-(2-ethyl-1H-benzo[d]imidazol-1-yl)thiazolo[5,4-d]pyrimidin-7-yl)morpholine

Participants

Reaction Steps

A mixture of 5-(2-ethylbenzoimidazol-1-yl)-7-morpholin-4-ylthiazolo[5,4-d]pyrimidine-2-carbaldehyde (200 mg, 0.51 mmol), 3,3-dimethyl-1-oxetan-3-ylpiperazine (100 mg, 0.65 mmol) and 4 Å powdered molecular sieves (200 mg) in DCE (10 mL) was allowed to stir at r.t. for 1 h before the addition of sodium triacetoxyborohydride (150 mg, 0.71 mmol). The resulting mixture was allowed to stir for 5 h then loaded onto an Isolute® SCX-2 cartridge which was washed with MeOH and the product eluted with 2M NH3/MeOH. The resulting residue was purified by column chromatography (Si-PCC, MeOH:EtOAc, 0-1%) followed by reverse phase HPLC (Phenomenex Gemini 5 μm C18, 20 mM triethylamine in water on a gradient of acetonitrile 5-98%) affording 813 (111 mg, 40%). LCMS (method G): RT 6.17 min [M+H]+ 549.3. 1H NMR (CDCl3, 400 MHz): δ 8.01-8.00 (1 H, m), 7.75-7.74 (1 H, m), 7.32-7.22 (2 H, m), 4.67 (2 H, t, J=6.47 Hz), 4.59 (2 H, t, J=6.08 Hz), 4.40 (4 H, brd s), 3.87 (6 H, t, J=4.72 Hz), 3.47-3.46 (1 H, m), 3.34 (2 H, q, J=7.47 Hz), 2.75 (2 H, t, J=4.94 Hz), 2.37 (2 H, brd s), 2.15 (2 H, brd s), 1.43 (3 H, t, J=7.47 Hz), 1.20 (6 H, s)

Provenance & Evidence