Influence of steric demand on ruthenium-catalyzed cycloaddition of sterically hindered azides
作者:Venkata S. Sadu、Sirisha Sadu、Seji Kim、In-Taek Hwang、Ki-Jeong Kong、Kee-In Lee
DOI:10.1039/c6ra25403a
日期:——
The RuAAC of sterically hindered 2,2-diaryl-2-azidoamines and terminal alkynes resulted in the unprecedented formation of 1,4-disubstituted-1,2,3-triazoles. A control experiment with 2-(azidomethyl)pyrrolidine revealed the usual selectivity with RuAAC and the reactions of azides with intermediate bulkiness gave mixtures of 1,4- and 1,5-regioisomers. The results suggest that the steric demands could
空间受阻的2,2-二芳基-2-叠氮基胺和末端炔烃的RuAAC导致空前形成1,4-二取代-1,2,3-三唑。用2-(叠氮甲基)吡咯烷的对照实验表明,通常用RuAAC具有选择性,叠氮化物在中等体积下的反应得到1,4-和1,5-区域异构体的混合物。结果表明,空间需求可以基本消除RuAAC的偏好和对区域选择性的影响。