NBS-Catalyzed Hydroamination and Hydroalkoxylation of Activated Styrenes
摘要:
N-Bromosuccinimide efficiently catalyzes the hydroamination and hydroalkoxylation of activated styrenes using tosylamides, carbamates, and alcohols as the nucleophiles to afford amino and ether derivatives, respectively. Both the processes give good to excellent yields of the products with 100% regioselectivity (Markovnikov fashion).
of sulfonamides with alcohols. The strongly acidic HBeta-M had a higher intrinsic activity with initial turnover frequency of 11 × 10–2 s–1 than those of H-form mordenite nanosheets (3.3 × 10–2 s–1) and montmorillonite (4.0 × 10–2 s–1) catalysts. The experiment and characterization results demonstrate that there are two parallel reaction routes on the acidic catalysts. One route is the reaction of
具有强酸性和中孔结构的高活性多相催化剂的开发是有机合成的极具吸引力的策略。在这项研究中,合成了具有大粒径和强酸性的介孔沸石β(HBeta-M),并将其用于磺酰胺与醇的直接N-烷基化。强酸性HBeta-M具有比H型丝光沸石纳米片(3.3×10 –2 s –1)和蒙脱石(4.0×10 –2)更高的固有活性,其初始转换频率为11×10 –2 s –1。 s –1)催化剂。实验和表征结果表明,酸性催化剂上存在两条平行的反应路线。一种途径是苯甲醇与对甲苯磺酰胺的反应(途径I)。另一途径是路线I中产生的二苯甲醚与对甲苯磺酰胺(路线II)的反应,这在本工作中发现。路线I的反应速率(13×10 –3 mol kg –1 s –1)高于路线II的反应速率(9.8×10 –3 mol kg –1 s –1))在HBeta-M上),但路线II主要以高选择性促成了目标产物的形成。因此,在这项工作中提出了一个完整的反应机理。
NBS-Catalyzed Hydroamination and Hydroalkoxylation of Activated Styrenes
作者:Siva Kumar Talluri、Arumugam Sudalai
DOI:10.1021/ol047402m
日期:2005.3.1
N-Bromosuccinimide efficiently catalyzes the hydroamination and hydroalkoxylation of activated styrenes using tosylamides, carbamates, and alcohols as the nucleophiles to afford amino and ether derivatives, respectively. Both the processes give good to excellent yields of the products with 100% regioselectivity (Markovnikov fashion).