Generation of Reactive Low-Valent Titanium Species Using Μetal−Αrenes as Efficient Organic Reductants for TiCl<sub>3</sub>: Applications to Organic Synthesis
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
Salt/ligand-activated low-valent titanium formulations: the ‘salt effect’ on diastereoselective carbon–carbon bond forming SET reactions
作者:Shyam M. Rele、Sandip K. Nayak、Subrata Chattopadhyay
DOI:10.1016/j.tet.2008.05.084
日期:2008.7
the construction of highly efficient low-valenttitanium (LVT) reagents. These salt-activated LVT reagents while exhibiting enhanced chemoselectivity and diastereoselectivity accelerated the reductive olefination rates of aromatic and aliphatic carbonyls under ambient temperature conditions and in much reduced reaction times. The versatility of the salted reagent was further explored in other single
A new method for the preparation of 2-aryl propionic acids using low-valent titanium
作者:Mariano García、Carmen del Campo、José V. Sinisterra、Emilio F. Llama
DOI:10.1016/s0040-4039(00)61527-7
日期:1993.12
The addition of dihalocarbenes to arylmethylketones in the presence of low-valenttitanium yields 2-aryl propionic acids in acceptable yield by one pot reaction. The reaction conditions were optimized. The TiCl4/LiAlH4 ratio is one variable that controls the selectivity of the process.