Generation of Reactive Low-Valent Titanium Species Using Μetal−Αrenes as Efficient Organic Reductants for TiCl<sub>3</sub>: Applications to Organic Synthesis
作者:Shyam Rele、Sanjay Talukdar、Asoke Banerji、Subrata Chattopadhyay
DOI:10.1021/jo001586a
日期:2001.5.1
for TiCl(3) has resulted in an efficient method for the generation of highly reactive low-valent titanium (LVT) reagents. The activated titanium species could be prepared by refluxing a mixture of substoichiometric amounts of arenes, TiCl(3), and Li/Mg in THF or DME. Among the LVT reagents screened, TiCl(3)--Li--naphthalene--THF (reagent I) was the best for coupling of carbonyls to olefins. The reagent
对金属芳烃体系用作TiCl(3)的有机还原剂的全面研究已产生一种高效的方法,用于生成高反应性的低价钛(LVT)试剂。可以通过回流亚化学计量量的芳烃,TiCl(3)和Li / Mg在THF或DME中的混合物来制备活化的钛物质。在筛选的LVT试剂中,TiCl(3)-Li-萘-THF(试剂I)最适合羰基与烯烃的偶联。与常规方法相比,该试剂可以在较低的温度下并且在大大减少的时间内对芳族和脂族底物进行麦克默里烯化。LVT试剂制备方法的细微变化影响了烯烃的立体异构率。