反应详情

A solution of 326a (134 mg, 0.3 mmol), 1,3 Dimethylbarbituric acid (94 mg, 0.6 mmol) and Tetrakis(triphenylphosphine)palladium (12 mg, 0.01 mmol) were stirred under Argon in 3 mL CH2Cl2. The reaction was followed by HPLC until all starting material disappeared. The crude was evaporated to dryness and taken up in dry THF. To this solution was added DIEA (230 ul, 1.5 mmol) and 3-anisoylchloride 0.3 mmol). The reaction was stirred for 3 h, EtOAc was added and the organic layer was extracted with NaHCO3 sat, HCl (0.1N) and brine. The dry solution was evaporated and purified by flash chromatography on silica gel using cyclohexane/EtOAc 7:3 as eluent. 326 was obtained as an oil (54 mg, 37%): H1 NMR (CDCl3) δ 7.43-7.25 (m, 4H), 7.15-7.05 (m, 2H), 6.60 (m, 1H), 4.83 (d, J=6.0 Hz, 2H), 3.86 (s, 3H), 3.35 (d, J=6.6, 2H), 335-3.23 (m, 3H), 2.95 (m, 2H), 1.94 (m, 2H), 1.86 (m, 2H), 1.70-1.50 (m, 5H), 1.30-1.20 (m, 8H), 0.87 (t, J=6.8, 3H), M/Z APCI: 495.2 (M+1).

1. customThe crude was evaporated to dryness
2. extractionthe organic layer was extracted with NaHCO3
3. customThe dry solution was evaporated
4. custompurified by flash chromatography on silica gel