contained in natural products. A novel tandem Friedel–Crafts reaction and subsequent stereoselective acetalization were developed with readily available aldehyde and ketone acid. The reaction proceeded smoothly in the presence of catalytic Bronsted acid and afforded the corresponding product with moderate yield and high stereoselectivity.
双环
缩酮骨架是重要的结构片段,经常包含在
天然产物中。使用现成的醛和
酮酸开发了一种新型的串联 Friedel-Crafts 反应和随后的立体选择性
缩醛化。反应在有催化作用的布朗斯台德酸存在下顺利进行,得到相应的产物,收率适中,立体选择性高。