Tungsten Wittig reagents: an efficient synthesis of α-functionalised tri- and tetrasubstituted alkenes
作者:A. Aguero、J. Kress、J. A. Osborn
DOI:10.1039/c39860000531
日期:——
The reaction of tungsten alkylidene complexes of the type W(CR1R2)X2Y2 with organic carbonyl groups is shown to enable a variety of di-, tri-, and tetra-substituted alkenes to be synthesised directly, including enol ethers and enamines.
已显示W(CR 1 R 2)X 2 Y 2类型的亚烷基钨配合物与有机羰基的反应可直接合成多种二,三和四取代的烯烃,包括烯醇醚和enamines。
bicyclic tert-alcohols afforded identical ring-expansion products via cationic anti-Markovnikov rearrangement from perpendicular tert-cations into identical six-membered ring secondary cations by the treatment with TiCl4. These results provide evidence that the reaction takes place by the cationic stepwisemechanism. [reaction: see text]