Hydrochloric Acid → HCID 67386941, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of oxazolidine-2,4-dione (50.5 mg, 0.50 mmol), LiCl (128 mg, 3.0 mmol) and anhydrous THF (5.0 mL) cooled to −78° C. was added dropwise 1.7 M tert-butyllithium solution in pentane (0.616 mL, 1.05 mmol). After stirring at −78° C. for 20 minutes, the reaction mixture was warmed to 0° C. for 5 minutes. The mixture was recooled to −78° C. and a solution of 4-(4-formyl-2-methoxy-phenoxy)-naphthalene-1-carbonitrile (Example 19a) was added dropwise. After stirring at −78° C. for 15 minutes, 1 N HCl (1.05 mL, 1.05 mol) was added dropwise. The reaction mixture was allowed to warm up to room temperature. After evaporation of most of the solvent, p-toluenesulfonic acid monohydrate (85 mg, 0.5 mmol) and toluene (25 mL) were added. The mixture was heated to reflux with a Dean-Stark trap for 5 hours. After removal of solvent, the residue was taken up with a mixture of DMF and methanol and purified on a preparative HPLC [Waters XTerra® Prep MS O8 OBD™ Column (5 μm, 30×50 mm) using a gradient mixture of 0.1% aqueous TFA and acetonitrile]. 1H NMR (400 Hz, DMSO-d6) δ 12.45 (s, 1H), 8.43 (d, 1H), 8.16 (s, 1H), 8.11 (d, 1H), 8.00 (d, 1H), 7.88 (t, 1H), 7.77 (t, 1H), 7.65 (d, 1H), 7.32 (d, 1H), 7.09 (s, 1H), 6.63 (d, 1H), 3.73 (s, 3H); LC/MS (m/z) [M+1]+ 386.9 (calculated for C22H14N2O6, 386.1).

Provenance & Evidence