Graphite/Methanesulfonic Acid (GMA) as a New Reagent for Sulfonylation of Phenols and Thia-Fries Rearrangement of Aryl Sulfonates to Sulfonylphenols
作者:Hashem Sharghi、Zahra Shahsavari-Fard
DOI:10.1002/hlca.200490295
日期:2005.1
A new facile method for direct sulfonylation of phenols was developed. Graphite in methanesulfonic acid (GMA) was used to prepare sulfonylphenols by sulfonylation of phenol and naphthalene derivatives with p-toluenesulfonic acid (=4-methylbenzenesulfonic acid) (Table 1) and the thia-Fries rearrangement of aryl sulfonates (Table 4). Mechanistic studies showed that the sulfonylation reaction of phenols
开发了一种新的直接苯酚磺酰化的简便方法。使用甲磺酸中的石墨(GMA)通过苯酚和萘衍生物与对甲苯磺酸(= 4-甲基苯磺酸)(表1)进行磺酰化以及芳基磺酸盐的硫-弗里斯重排(表4)来制备磺酰基苯酚。机理研究表明,GMA中苯酚的磺酰化反应是通过最初的磺酸盐形成,然后通过分子间机理使芳基磺酸盐的硫-弗里斯重排而发生的(方案3)。