2-Substituted 1,3-benzoxathiolium tetrafluoroborates were used for the two-step acylation of electron-rich aromatic and heteroaromatic compounds: 1,3-dimethoxybenzene, 1,3,5-trimethoxybenzene, pyrrole and indoles. In most of the cases intermediate 2,2-disubstituted 1,3-benzoxathioles were obtained in good to high yields (55-100%) and subsequent hydrolysis of these with mercury(II) oxide and aqueous tetrafluoroboric acid (35%) in tetrahydrofuran afforded the corresponding ketones in almost quantitative yields.
2-取代的1,3-苯并噁
硫鎓四
氟硼酸盐被用于富电子芳香和杂芳香化合物的两步酰基化反应:1,3-二
甲氧基苯、
1,3,5-三甲氧基苯、
吡咯和
吲哚。在大多数情况下,中间体2,2-二取代的1,3-苯并噁
硫化物以良好至高产率(55-100%)获得,随后用氧化
汞(II)和
水性四
氟硼酸(35%)在
四氢呋喃中的
水解反应,几乎定量地提供了相应的酮。