Low-Valent Titanium-Mediated Radical Conjugate Addition Using Benzyl Alcohols as Benzyl Radical Sources
作者:Takuya Suga、Shoma Shimazu、Yutaka Ukaji
DOI:10.1021/acs.orglett.8b02305
日期:2018.9.7
A concise method to directly generate benzyl radicals from benzyl alcohol derivatives has been developed. The simple and inexpensive combination of TiCl4(collidine) (collidine = 2,4,6-collidine) and manganese powder afforded a low-valent titanium reagent, which facilitated homolytic cleavage of benzylic C–OH bonds. The application to radical conjugate addition reactions demonstrated the broad scope
已经开发出一种直接从苄醇衍生物产生苄基的简明方法。TiCl 4(可力丁)(可力丁= 2,4,6-可力丁)和锰粉的简单而廉价的组合提供了一种低价的钛试剂,可促进苄基C-OH键的均质裂解。自由基共轭加成反应的应用证明了该方法的广泛范围。各种苯甲醇衍生物与缺电子烯烃的反应提供了相应的自由基加合物。