反应详情

A solution of 327c (100 mg, 0.22 mmol), 1,3-Dimethylbarbituric acid (69 mg, 0.44 mmol) and Tetrakis(triphenylphosphine)palladium (12 mg, 0.01 mmol) were stirred in 3 mL CH2Cl2 overnight. The deprotection was followed by TLC. After complete cleavage of the protecting groups, the solvent was evaporated to dryness. The crude was taken up in THF, DIEA (76 ul, 0.33 mmol) was added, followed by the slow addition of 3-anisoylchloride (38 mg, 0.22 mmol) in THF. The reaction was stirred for 3 h, diluted with EtOAc and extracted with NaHCO3 and brine. The organic layers were dried over Na2SO4 and evaporated to dryness. The crude mixture was purified by flash chromatography on silica gel using cyclohexane/EtOAc 1:1 as eluent to obtain 30 mg (50%) of 327 as a colorless oil: H1 NMR (CDCl3) δ 7.40-7.10 (m, 3H), 6.95 (m, 2H), 6.45 (m, 1H), 4.70 (d, J=6.0 Hz, 2H), 3.74 (s, 3H), 3.58 (m, 2H), 2.40 (m, 2H), 2.27 (t, J=7.5 Hz, 2H), 2.19 (m, 1H), 1.77 (m, 2H), 1.64 (m, 2H), 1.13 (m, 8H), 0.74 (t, J=6.8 Hz, 3H), M/Z APCI: 506.3 (M+1).

1. customAfter complete cleavage of the protecting groups, the solvent was evaporated to dryness
2. extractionextracted with NaHCO3 and brine
3. dry with materialThe organic layers were dried over Na2SO4
4. customevaporated to dryness
5. customThe crude mixture was purified by flash chromatography on silica gel