反应详情

A solution of 4,6-bis(1,1-dimethylethyl)-5-hydroxypyrimidine-2-carboxaldehyde (0.5 g, 2.1 mmol) and α-triphenylphosphoranylidene-γ-butyrolactone (Katsumi, et al. Chem. Pharm. Bull. [Japan] 1986, 34, 619) (0.95 g, 2.8 mmol) in 50 mL of toluene is warmed to 60° C. overnight. The toluene is evaporated and the residue purified by flash chromatography (silica, 20% EtOAc/hexane). Recrystallization from hexane gives 0.4 g (62%) of α-[[4,6-bis(1,1-dimethylethyl)-5-hydroxy-2-pyrimidinyl]methylene]-γ-butyrolactone, mp 158°-160° C.

1. customThe toluene is evaporated
2. customthe residue purified by flash chromatography (silica, 20% EtOAc/hexane)
3. customRecrystallization from hexane