An Efficient Synthetic Strategy for Geometrically Pure Symmetrical and Unsymmetrical Hydroxystilbenes via McMurry Coupling
作者:Subrata Chattopadhyay、Narayan V. Mayekar、Sandip K. Nayak
DOI:10.1055/s-2003-41004
日期:——
Intramolecular reductive deoxygenation of ethylene-dioxy tethered symmetrical and unsymmetrical aromatic bis(carbonyl) ethers with the low-valenttitanium (LVT) reagent (TiCl 4 -Zn-THF) yielded chromatographically separable E/Z-isomers of corresponding cyclic stilbenes which were further dealkylated to obtain geometrically pure hydroxystilbenes. The intramolecular McMurry coupling of the tethered bis(carbonyl)