intermediary amino compounds are isolated. The reaction involves many reversible steps, and the stereochemistry of products is determined in the elimination step from the intermediary compounds via stable planar carbanions, in which the small difference in the stericrequirements of two electron-withdrawing groups is effective. Steric and electronic effects in the intermediates sometimes bring about the
Three-step α-Acylation of (<i>E</i>)-Cinnamate Esters with Inversion of Stereochemistry through Formation and Cleavage of Carbon–Pentamethylcyclopentadienyl Bonds
作者:Minoru Uemura、Hideki Yorimitsu、Koichiro Oshima
DOI:10.1246/cl.2006.408
日期:2006.4
The reaction of cinnamate esters with lithium pentamethylcyclopentadienide in the presence of chlorodiethylaluminum provides the corresponding 1,4-adducts in high yield. The adducts undergo α-acyla...
We report the phosphine-catalyzed intermolecular carbofluorination of alkynes using acyl fluorides as fluorinating reagents. This reaction promises to be a useful method for the synthesis of highly substituted monofluoroalkene derivatives since acyl fluorides can be easily prepared from the corresponding carboxylic acid derivatives and the reaction proceeds under ambient conditions without the need