Water → HCID 59659981, compound

Participants

Reaction Steps

To 159a (1.0016 g, 3.9 mmol) dissolved in acetone (20 mL) was added a solution of cycloheptylamine (0.5 mL, 3.9 mmol) in acetone (5 mL) followed by addition of 2.5 N NaOH (1.6 mL, 3.9 mmol) and water (4 mL). The reaction mixture was allowed to stir at reflux for 3 hours under nitrogen. The reaction mixture was extracted 3 times with dichloromethane; the combined organic layers were washed with brine and dried over potassium carbonate. The filtered sample was concentrated by rotary evaporation and the resulting solid was dried overnight under vacuum. Flash column chromatography (SiO2, 70:30 hexanes:ethyl acetate) yielded an off-white solid (159b, 908 mg, 69%), mp 148° C.; HPLC: Inertsil ODS-3V C18, 30:70 [KH2PO4 (0.0M, pH 3.2): CH3CN], 264 nm, Rt 22.3 min, 79.2% purity; MS (TOF MS ES+): m/z 413 (60.4), 338 (44.0), 336 (M+H, 100).

Provenance & Evidence