Selective one carbon-carbon bond formation reaction of zirconacyclopentadienes with aryl iodides or alkynyl iodides
摘要:
Reaction of zirconacyclopentadienes with one equiv or two equiv of aryl iodides in the presence of CuCl and DMPU afforded mono-arylated diene derivatives in high yields with high selectivities. Treatment of zirconacyclopentadienes with one equiv of 2-thienyl iodide similarly gave thienyldienes in the presence of CuCl and DMPU, whereas the reaction with two equiv of 2-thienyl iodide produced thienyl iododiene derivatives in high yields. Zirconacyclopentadienes reacted with two equiv of alkynyl iodides to give iododienynes in good yields in the presence of CuCl. This is in sharp contrast to the reaction with two equiv of alkynyl iodides in the presence of CuCl and DMPU which provides dienediynes. (C) 1997 Elsevier Science Ltd. All rights reserved.
Dearomatizing Anionic Cyclization of 1-Lithio-4-naphthyl-1,3-butadienes Leading to the Formation of Spiro Cyclopentadiene Derivatives
作者:Zhenfeng Xi、Zhihui Wang
DOI:10.1055/s-2006-939083
日期:——
On treatment with t-BuLi, 1-iodo-4-naphthyl-1,3-butadiene derivatives cyclize with dearomatization to give spiro compounds bearing a moiety of allyllithium, which reacts further with electrophiles to yield spiro tricyclic systems.