The acyl(alkoxycarbonyl)ketene dithioacetals 2 prepared from the corresponding ß-keto esters 1 in almost quantitative yield are reduced selectively with magnesium in methanol and subsequently dealkoxycarbonylated to give protected ß-keto aldehydes 4 high yields.
由相应的β-
酮酯1几乎定量地制备得到的酰基(烷氧羰基)烯酮二
硫缩醛2,在
甲醇中与
镁选择性还原,随后去烷氧羰基化,得到高产率的保护β-酮醛4。