Lewis acid-controlled reactions of zirconacyclopentadienes with isocyanates and isothiocyanates. One-pot three- or four-component synthesis of multiply substituted iminocyclopentadienes and butadiene-tethered 1,6-bisamides and electrophilic cyclization
作者:Qiaoshu Hu、Jiang Lu、Congyang Wang、Chao Wang、Zhenfeng Xi
DOI:10.1016/j.tet.2007.02.015
日期:2007.7
products in high isolated yields from the reactions of zirconacyclopentadienes with isocyanates, depending on the substituents of isocyanates. The reactionpath and products could be controlled by Lewis acids. As a demonstration of the usefulness of thus obtained unsaturated bisamides, electrophilic cyclization using acids, NBS, and I2 was carried out. Electrophilic cyclization of multisubstituted conjugated