Synthesis and Photophysical Properties of Some Rigidized Hepta- and Nonamethine Mono- and Bis(merocyanines): Ring-Opening of Quaternized 2-Methylbenzothiazole
作者:Lilia Viteva、Tzveta Gospodova、Jivka Rashkova、Isaac Abrahams、Iliana Timtcheva、Svetlana Simova、Marie Rose Mazieres、Jean Gérard Wolf
DOI:10.1002/ejoc.200700125
日期:2007.7
We have developed a simple and efficient method for the synthesis of rigidized mono- and bis-heptamethine merocyanines that contain one methine unit incorporated into a cyclopentene framework. The synthetic approach is based on C1/C5 regioselective nucleophilic addition of mono- and diketone lithium enolates to readily available pentamethine cyanines with inherent rigidity followed by a Hofmann elimination