Unprecedented reductive dealkoxylation of aryl alkyl ethers and intramolecular C–C coupling of 2,2′-dialkoxystilbenes with low valent titanium: one-pot synthesis of phenanthrenes
SnCl4–Zn: a novel reductive system for deoxygenative coupling of aliphatic, aromatic, chalcone epoxide, and indanone carbonyl compounds to olefins
作者:Gulab Khushalrao Pathe、Naseem Ahmed
DOI:10.1016/j.tetlet.2015.01.194
日期:2015.3
SnCl4–Zn complex provided a novel reductive system in the deoxygenative cross-coupling of aliphatic, aromatic, chalcone epoxide and indanone carbonyl compounds to olefins in high yield (55–86%) at reflux temperature in THF. The advantage of this reagent is inexpensive, short reaction time, and high yield compared to the reagents used in the McMurry cross-coupling reaction.
Influence of External Ligands and Auxiliaries on the Reactivity of Low-Valent Titanium in McMurry Reaction: Selectivity and Mechanistic Profile
作者:N. Balu、S. K. Nayak、A. Banerji
DOI:10.1021/ja9535221
日期:1996.1.1
auxiliaries also resisted deoxygenation completely to give the pinacols in higher yields and better diastereoselectivity, as compared to pyridine-modified LVT system. Amongst these modified reagents, the LVT−catechol (1:1) system was found to be the most efficient combination for total pinacolization of aromatic carbonyl compounds, even under refluxing conditions. The actual titanium reagent responsible
The selective cross McMurry couplings of diaryl or aryl ketones with various substituted ketones were achieved in 53−94% isolated yields. It is believed that the strong affinity of the substituents to the low-valent titanium surface plays an important role in regards to moderating selectivity. Through the introduction of such substituents followed by their removal post McMurry coupling, structurally