Lithium Hydroxide → 2-hydroxy-1-(3-((2-(2-isopropyl-1H-benzo[d]imidazol-1-yl)-9-methyl-6-morpholino-9H-purin-8-yl)methyl)azetidin-1-yl)-2-methylpropan-1-one

Participants

Reaction Steps

A mixture of acetic acid 1,1-dimethyl-2-{3-[9-methyl-2-(2-isopropylbenzoimidazol-1-yl)-6-morpholin-4-yl-9H-purin-8-ylmethyl]azetidin-1-yl}-2-oxoethyl ester (56 mg, 0.17 mmol) and LiOH (84 μL, 0.33 mmol, 4M solution) in THF (3 mL) and MeOH (1 mL) was allowed to stir at r.t. for 18 h. Further LiOH (495 μL, 1.98 mmol, 4M solution) and the mixture stirred at 50° C. for 5 days. The reaction mixture was concentrated in vacuo and the resulting residue 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, 0-5%) then partitioned between DCM and H2O, the organic phase dried (Na2SO4) and concentrated in vacuo. The resulting residue was dissolved in a mixture of MeCN and H2O and allowed to freeze-dry affording 854 as a white solid (62 mg, 70%). LCMS (method I): RT 3.15 min, [M+H]+ 533.4. 1H NMR (DMSO, 400 MHz): δ 7.87-7.86 (1 H, m), 7.65-7.64 (1 H, m), 7.25-7.24 (2 H, m), 5.02 (1 H, brd s), 4.57 (1 H, t, J=8.92 Hz), 4.25 (4 H, brd s), 4.18 (1 H, dd, J=10.40, 5.66 Hz), 4.03 (1 H, t, J=9.00 Hz), 3.91-3.90 (1 H, m), 3.76 (4 H, t, J=4.59 Hz), 3.72 (3 H, s), 3.68 (1 H, dd, J=9.99, 5.41 Hz), 3.22-3.21 (3 H, m), 1.36 (3 H, s), 1.34 (3 H, s), 1.25 (6 H, d, J=2.06 Hz)

Provenance & Evidence