Hydrochloric Acid → 7-[4-(3-Amino-oxetan-3-yl)-phenyl]-8-phenyl-2H-9-oxa-1,2,3a-triaza-cyclopenta[a]naphthalene-3,6-dione

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Reaction Steps

To a stirred solution of 2-methyl-propane-2-sulfinic acid (3-{-4-[3,6-dioxo-8-phenyl-2-(2-trimethylsilanyl-ethoxymethyl)-2,6-dihydro-3H-9-oxa-1,2,3a-triaza-cyclopenta[a]naphthalen-7-yl]-phenyl}-oxetan-3-yl)-amide (46 mg, 0.07 mmol) in MeOH (6 mL) was added a solution of HCl in dioxane (4 M, 0.14 mL, 0.56 mmol) at RT. After 1 h, the reaction mixture was evaporated to dryness. The residue was suspended in DCM (5 mL), cooled in an ice bath, and TFA (1 mL) was added. The mixture was stirred at RT for 1 h before evaporating to dryness. The residue was dissolved in MeOH and loaded on to a 2 g SCX-2 cartridge. The cartridge was washed with MeOH before eluting with 2 M NH3 in MeOH solution. The eluent was collected and evaporated. The resulting residue was subjected to flash chromatography (SiO2, gradient 10 to 30% 2 M NH3/MeOH in DCM) to afford the title compound (15 mg, 52%) as a pale yellow solid. 1H NMR (400 MHz, DMSO-d6): δ 7.81 (d, J=7.2 Hz, 1H), 7.54 (d, J=8.3 Hz, 2H), 7.44-7.36 (m, 5H), 7.22 (d, J=8.2 Hz, 2H), 6.97 (d, J=7.2 Hz, 1H), 4.70 (d, J=6.1 Hz, 2H), 4.66 (d, J=6.1 Hz, 2H). LCMS (Method E): RT=2.35 min, [M+H]+=427.

Provenance & Evidence