Nucleophilic addition of organolithium reagents to cyanine dyes. A new access to functionalized hexatrienes
作者:Lilia Viteva、Tzveta Gospodova、Yuri Stefanovski、Marie-Rose Mazières、Jean Gérard Wolf
DOI:10.1016/s0040-4039(01)01672-0
日期:2001.11
The possibility for extending a pentamethine carbon chain by the use of an appropriate pair of electrophilic substrates, a cyanine dye- and nucleophilic-organolithium reagent is explored. A new synthetic approach to differently functionalized hexatrienes was achieved as a result of spontaneous or accelerated on silica gel surface Hofmann type elimination of the initially formed adducts. A series of