Single-flask polyfunctionalization of the imidazole ring; a streamlined route to the antitumor agent carmethizole
摘要:
Three sequential treatments of an N-protected tribromoimidazole with n-BuLi / electrophile in a 1-pot process leads to N-protected 2,4,5-trisubstituted imidazoles. The method can be applied to the preparation of the immediate precursor of carmethizole.
Synthesis and Chemistry of 4,5-Dimagnesioimidazole Dianions
作者:Ralf H.-J. Butz、Stephen D. Lindell
DOI:10.1021/jo0161680
日期:2002.4.1
procedure for the generation of 4,5-dimagnesioimidazoles is described. N-Protected 2-substituted 4,5-diiodoimidazoles were treated with i-PrMgCl (2.4 equiv) in THF at 0-5 degrees C. The resulting vicinal dianions reacted with electrophiles to give 4,5-disubstituted imidazoles in 27-71% yields.
Single-flask polyfunctionalization of the imidazole ring; a streamlined route to the antitumor agent carmethizole
作者:Bruce H. Lipshutz、William Hagen
DOI:10.1016/s0040-4039(00)61074-2
日期:1992.9
Three sequential treatments of an N-protected tribromoimidazole with n-BuLi / electrophile in a 1-pot process leads to N-protected 2,4,5-trisubstituted imidazoles. The method can be applied to the preparation of the immediate precursor of carmethizole.