反应详情

A mixture of 2.9 g (6 mmol) of triphenylsulfonium 2-benzoyloxyethanesulfonate prepared in Synthesis Example 1-11, 56 mg (0.3 mmol) of 28 wt % sodium methoxide in methanol, and 15 g of methanol was stirred at room temperature for 12 hours. To the reaction solution, 30 mg of 35% aqueous hydrochloric acid was added to quench the reaction. The reaction solution was combined with methyl isobutyl ketone and concentrated in vacuum while distilling off the residual water. Diisopropyl ether was added to the residue for recrystallization. The crystals were collected and dried, obtaining the target compound, triphenylsulfonium 2-hydroxyethanesulfonate. White crystals, 2.1 g, yield 96%. The compound, designated PAG intermediate 1, has the following structure.

1. customto quench
2. customthe reaction
3. concentrationconcentrated in vacuum
4. distillationwhile distilling off the residual water
5. additionDiisopropyl ether was added to the residue for recrystallization
6. customThe crystals were collected
7. customdried