8-Functionalization of Alkyl-Substituted-3,8-Dimethyl BODIPYs by Knoevenagel Condensation
作者:Eduardo Palao、Antonia R. Agarrabeitia、Jorge Bañuelos-Prieto、Teresa Arbeloa Lopez、Iñigo Lopez-Arbeloa、Diego Armesto、Maria J. Ortiz
DOI:10.1021/ol401993p
日期:2013.9.6
New 8-alkenyIBODIPYs have been synthesized by Knoevenagel condensation between a series of alkyl-substituted-3,8-dimethylBODIPYs and aromatic or aliphatic aldehydes. This is in clear contrast with literature precedents, which indicate that this reaction occurs exclusively on the methyl group at C-3. The change in hybridization of the carbon at the 8-position (from sp(3) to sp(2)) determines the fluorescence emission of the BODIPY, while the presence of electron-donating or -withdrawing groups leads to intramolecular charge transfer processes.