Synthesis of Directly Connected BODIPY Oligomers through Suzuki–Miyaura Coupling
摘要:
Treatment of a meso-arylboron dipyrrin (BODIPY) with NBS provides mono- and dibromlnated BODIPYs at the 2- and 6-positions In excellent yields with high regioselectivity. Brominated products can be employed as a nice building block for the synthesis of a variety of BODIPY derivatives through Suzuki-Miyaura coupling. Because of a lack of substituents at the 1,3,5,7-positions, a directly beta-beta-linked BODIPY dimer exhibits a completely coplanar conformation of BODIPY units, offering effective pi-conjugation.
Highly Regioselective α-Chlorination of the BODIPY Chromophore with Copper(II) Chloride
摘要:
A general and efficient method for a-chlorination of 4,4'-difluoro-4-bora-3a,4a-diaza-s-indacenes (BODIPYs) has been developed using CuCl2 as chlorination reagent. The reaction is characterized by complete 3/5-positions of BODIPY regioselectivity. This unusual highly regioselective alpha-halogenation of BODIPY is in sharp contrast to previously reported halogenation methods which preferred to occur first at the 2,6-positions of BODIPY. This approach provides a straightforward, facile, and economical route to 3- and/or 5-chloroBODIPYs with various meso-groups (H, alkyl, and aryl) and their derivatives.
Significant Enhancement of Absorption and Luminescence Dissymmetry Factors in the Far‐Red Region: A Zinc(II) Homoleptic Helicate Formed by a Pair of Achiral Dipyrromethene Ligands
A homoleptic zinc(II) helicate organized by a pair of achiral dipyrrometheneligands through zinc(II) coordination was synthesized to evaluate the chiroptical properties. This zinc complex showed strong exciton‐coupled chiroptical responses from the helical configuration with a large absorption dissymmetry factor |gabs| (up to 0.20). More importantly, intense polarized luminescence in the far‐red region
two terminal nonplanar units of BODIPYs. The oxidation and reduction potentials agree with the estimated energies obtained through DFT calculations. The localized HOMO and LUMO states suggested the intramolecular charge-transfer characteristics in these BODIPY derivatives. The absorption spectra of these compounds extended up to the near-IR region. Strong redshifted trends of fluorescence spectra were
naphthyl-BODIPYs have been synthesized through a facile one-pot palladium-catalyzed domino reaction of BODIPY precursors (2-bromo-BODIPYs) with diarylethynes, via “cis, cis” and “trans, cis” addition transition states with alkynes, respectively. This reaction exhibits unprecedentedly complete cyclization regioselectivity to the a-position of the BODIPY over the b-one, and the resulting products can be effectively
通过BODIPY前体(2-溴-BODIPYs)与二芳基乙炔的简单的一锅钯催化多米诺反应,通过“顺式,顺式”合成了一系列的苯并[ a ]稠合的BODIPY和相应的异构萘基-BODIPY。和“反式,顺式”分别与炔烃的加成过渡态。该反应对BODIPY的b位上的BODIPY的a位表现出前所未有的完全环化区域选择性,并且可以通过在二芳基乙炔上选择取代基来有效调节所得产物。
Synthesis and Photophysical Properties of Naphtho[b]- and Indeno[b]-fused BODIPYs
作者:Baogeng Wu、Zhikuan Zhou、Lei Chen、Aihua Yuan
DOI:10.1016/j.dyepig.2020.108676
日期:2020.12
Electron donating methoxy group facilitate both the 6-endo and 5-exo cyclization procedure to produce naphtho[b]- and indeno[b]-fused BODIPYs in one pot reaction. Naphtho[b]-fused BODIPY exhibits redshiftedabsorption and emission (591 nm/621 nm) with higher quantum yield (0.56 in DCM), while indeno[b]-fused BODIPY shows very low quantum yield (0.01 in DCM) with shorter absorption and emission wavelength
报道了一种新的合成方法,该方法通过PtCl 2催化的被外围苯乙炔取代的BODIPYs的环异构化反应来构建[ b ]融合的BODIPY衍生物。供电子甲氧基便于将6-内切和5-外型环化方法,以产生萘并[ b ] -茚并[ b ]在一锅反应-融合BODIPYs。萘并[ b ]融合的BODIPY表现出红移的吸收和发射(591 nm / 621 nm),具有更高的量子产率(在DCM中为0.56),而茚并[ b融合的BODIPY的量子产率非常低(在DCM中为0.01),具有较短的吸收和发射波长(571 nm / 600 nm)和较强的吸收强度。量子化学计算表明,环戊二烯基环在茚并[ b ]稠合的BODIPY中具有抗芳香性,这是其光化学性质较差的原因。