反应详情

According to the above procedure, 3-furaldehyde is brominated to give 5-bromo-3-furaldehyde which is then reacted with a Grignard reagent (R3MgX) and the resulting mixture treated with t-butyl lithium and trimethylsilyl chloride to give 4-[R3 --CH(OH)]-2-trimethylsilylfuran. Alternatively, 5-bromo-3-furaldehyde is converted to the dimethylacetal, then treated with t-butyl lithium and trimethylsilyl chloride to give 5-trimethylsilyl-3-furaldehyde which is reacted with R3MgX or R3Li to give 4-[R3 --CH(OH)]-2-trimethylsilylfuran. Treating this intermediate with oxygen and irradiation using an initiator such as Rose Bengal gives 4-[R3 --CH(OH]-5-hydroxy-2(5H)-furanone.