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
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
作者:Asoke Banerji、Sandip K. Nayak
DOI:10.1039/c39910001432
日期:——
Facile dealkoxylation of aryl alkyl ethers has been carried out using TiCl3âLiâTHF (tetrahydrofuran); a novel one-pot synthesis of phenanthrenes from ortho-alkoxyaromatic aldehydes/ketones is described.
Dramatic Influence of Nitrogen Heterocycles on the Activity of Low-Valent Titanium Reagent: An Improved One-Pot Synthesis of Phenanthrenes
作者:Suresh M Kadam、Sandip K. Nayak、Asoke Banerji
DOI:10.1080/00397919508010799
日期:1995.1
A novel low-valent titanium (LVT) induced one-pot synthesis of phenanthrenes (25-38% yield) from ortho-alkoxy aromatic aldehydes/ketones was reported by us earlier. Activity of LVT complex could be modulated rationally by using catalytic amount of pyridine. Use of this LVT-pyridine reagent system improved the yields of phenanthrenes (3) by two folds.
Aerobic Copper-Catalyzed Intramolecular Cascade Oxidative Isomerization/[4+4] Cyclization of 2,2′-Disubstituted Stilbenes
through a sequence of rapid single-electron oxidation/[4+4] cyclization from 2,2′-disubstituted stilbene. The antarafacial manner of the thermally allowed [4+4] cyclization was further proven by series of control experiments and density functional theory calculations. Our findings provide an important addition to the aerobic copper-catalyzedoxidativecyclization.