Treatment of 2,3-dihydro-1H-indol-3-ones with allyl alcohols in the presence of camphorsulfonic acid and magnesium sulfate at 130 °C gave, via condensation and a Claisen rearrangement, 2-allyl-2,3-dihydro-1H-indol-3-ones in good yields. The stereochemistry of the products was determined by NOE experiments.
2,3- 二氢-1H-吲哚-3-酮与烯丙基醇在樟脑磺酸和硫酸镁存在下于 130 ℃ 处理,通过缩合和克莱森重排,得到 2-烯丙基-2,3-二氢-1H-吲哚-3-酮,收率很高。通过 NOE 实验确定了产物的立体化学性质。