Sulfonylation of the benzylic C–H bond is developed through a three-component reaction of aryldiazonium tetrafluoroborates, 4-methylphenols and sodium metabisulfite (Na2S2O5). The inorganic sulfite of sodium metabisulfite is used as the SO2 surrogate. In this transformation, benzylic C(sp3)–H bond sulfonylation is achieved in the presence of a photocatalyst under visible light. A radical pathway involving
苄基CH键的磺酰化是通过四氟硼酸芳基重氮,4-甲基苯酚和焦亚硫酸钠(Na 2 S 2 O 5)的三组分反应形成的。偏亚硫酸氢钠的无机亚硫酸盐用作SO 2替代物。在这种转化中,在可见光下,在光催化剂的存在下,实现了苄基的C(sp 3)–H键磺酰化。提出了涉及芳基磺酰基和分子间氢原子抽象的自由基途径。
Koutek,B. et al., Collection of Czechoslovak Chemical Communications, 1976, vol. 41, p. 2250 - 2255
作者:Koutek,B. et al.
DOI:——
日期:——
Iodide/<i>tert-</i>Butyl Hydroperoxide-Mediated Benzylic C-H Sulfonylation and Peroxidation of Phenol Derivatives
作者:Wen-Chao Yang、Peng Dai、Kai Luo、Lei Wu
DOI:10.1002/adsc.201600541
日期:2016.10.20
iodine/tert‐butyl hydroperoxide (I2/TBHP)‐mediated benzylic C–H sulfonylation of phenol derivatives. This new methodology provides an economic, operationally simple and metal‐free approach toward C(sp3)–S bond formation with medium to excellent yields at room temperature. Moreover, a novel sulfonylative and peroxidative bifunctionalization of phenol derivatives was also achieved by changing the amount of