Cesium carbonate → HCID 16068007, compound

Participants

Reaction Steps

To a solution of 4 (50 mg, 0.17 mmol) in DMF (4 mL) was added 3-methoxybenzaldehyde (31.4 μL, 0.26 mmol) and the solution was repeatedly evacuated in a short time to remove oxygen and flushed with Ar, followed by the addition of Cs2CO3 (111.9 mg, 0.34 mmol) and the evacuation-flushing process was repeated again. The resultant mixture was heated for 3 h at 85□. After the solvent was removed by evaporation, the residue was AcOEt, washed with water for two times and saturated NaCl for three times, dried over Na2SO4 and concentrated in vacuo. The resulting residue was dissolved in 70% MeCN aq and applied to reverse-phase HPLC column (μBondasphere 5C18 100 A, 19×150 mm) and eluted using a linear gradient from 30 to 100% CH3CN in 0.1% TFA aq over 30 min at a flow rate of 12 mL/min, and the desired fraction was collected and concentrated by evaporation to give a 35.3 mg (55.9%) of yellow colored KPU-201. mp 114-116° C.; 1H NMR (300 MHz, CDCl3) δ 11.40 (br s, 1H), 8.14 (br s, 1H), 7.88 (s, 1H), 6.96-7.00 (m, 2H), 6.92 (s, 1H), 6.88 (s, 1H), 6.88-6.92 (m, 1H), 3.83 (s, 3H), 1.44 (s, 9H); HRMS (EI) m/z 367.1538 (M+) (calcd for C20H21N3O4: 367.1532).

Provenance & Evidence