Synthesis of Novel Quinaldine-Based Squaraine Dyes: Effect of Substituents and Role of Electronic Factors
摘要:
[GRAPHICS]Condensation of squaric acid with quinaldinium salts containing electron-donating substituents gave only the semisquaraines. However, with salts possessing electronegative and electron-withdrawing groups, the squaraine dyes were isolated in quantitative yields. The semisquaraines formed undergo condensation with highly nucleophilic salts yielding the unsymmetrical squaraine dyes. These results demonstrate the role of electronic factors and provide valuable information for the design of efficient squaraine-based sensitizers that can have potential applications in photodynamic therapy.
Synthesis of Novel Quinaldine-Based Squaraine Dyes: Effect of Substituents and Role of Electronic Factors
摘要:
[GRAPHICS]Condensation of squaric acid with quinaldinium salts containing electron-donating substituents gave only the semisquaraines. However, with salts possessing electronegative and electron-withdrawing groups, the squaraine dyes were isolated in quantitative yields. The semisquaraines formed undergo condensation with highly nucleophilic salts yielding the unsymmetrical squaraine dyes. These results demonstrate the role of electronic factors and provide valuable information for the design of efficient squaraine-based sensitizers that can have potential applications in photodynamic therapy.
Synthesis of Novel Quinaldine-Based Squaraine Dyes: Effect of Substituents and Role of Electronic Factors
作者:Kuthanapillil Jyothish、Kalliat T. Arun、Danaboyina Ramaiah
DOI:10.1021/ol048411y
日期:2004.10.1
[GRAPHICS]Condensation of squaric acid with quinaldinium salts containing electron-donating substituents gave only the semisquaraines. However, with salts possessing electronegative and electron-withdrawing groups, the squaraine dyes were isolated in quantitative yields. The semisquaraines formed undergo condensation with highly nucleophilic salts yielding the unsymmetrical squaraine dyes. These results demonstrate the role of electronic factors and provide valuable information for the design of efficient squaraine-based sensitizers that can have potential applications in photodynamic therapy.