2-Substituted 1,3-Benzoxathiolium Tetrafluoroborates as Useful Acylating Agents of Electron-Rich Aromatic and Heteroaromatic Compounds
作者:Silvano Cadamuro、Iacopo Degani、Rita Fochi、Antonella Gatti、Valeria Regondi
DOI:10.1055/s-1987-27931
日期:——
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。