Triphenylphosphine → HCID 86683482, compound

Participants

Reaction Steps

To a solution of 5-(5-(4-hydroxyphenyl)-8-oxo-6-thioxo-5,7-diazaspiro[3.4]octan-7-yl)-3-(trifluoromethyl)picolinonitrile (Compound 63, 150 mg, 0.36 mmol), 1-methylpiperidin-4-ol (50 μL, 0.39 mmol), and triphenylphosphine (125 mg, 0.47 mmol) in anhydrous THF (2 mL) was added diisopropyl azodicarboxylate (0.1 mL, 0.47 mmol) and the reaction mixture was stirred at room temperature overnight. Additional 1-methylpiperidin-4-ol (50 μL, 0.39 mmol), triphenylphosphine (125 mg, 0.47 mmol) and diisopropyl azodicarboxylate (0.1 mL, 0.47 mmol) was added and the reaction was allowed to stir an additional 16 h. The mixture was partitioned between EtOAc and water and the aqueous layer was extracted with EtOAc (2×). The combined organics were washed with water and brine, then dried over magnesium sulfate and concentrated in vacuo. Purification by silica gel chromatography (0 to 80% EtOAc/hexanes, then 0 to 5% MeOH/dichloromethane) gave impure product which was further purified by preparative HPLC (40 to 75% acetonitrile/water, 0.1% TFA) to afford 45 mg of 5-(5-(4-((1-methylpiperidin-4-yl)oxy)phenyl)-8-oxo-6-thioxo-5,7-diazaspiro[3.4]octan-7-yl)-3-(trifluoromethyl)picolinonitrile as a pale yellow solid. 1H NMR (300 MHz, DMSO-d6) δ 9.22 (d, 1H), 8.76 (d, 1H), 7.30 (d, 2H), 7.15 (d, 2H), 4.52-4.39 (m, 1H), 2.72-2.56 (m, 4H), 2.49-2.38 (m, 2H), 2.25-2.14 (m, 5H), 2.03-1.90 (m, 3H), 1.77-1.49 (m, 3H). LCMS [M+1]+ 516.0.

Provenance & Evidence