Microwave-Assisted Facile Synthesis of Red-Shifted Azobenzene Glycoconjugates
作者:Vivek Poonthiyil、Franziska Reise、Guillaume Despras、Thisbe K. Lindhorst
DOI:10.1002/ejoc.201801078
日期:2018.12.6
The first red‐shifted photoswitchable glycoconjugates are reported. Microwave‐assisted late‐stage C–H chlorination was employed to achieve tetra‐ortho‐chlorinated azobenzene glycoconjugates. To investigate orientational control in carbohydrate recognition, a red‐shifted glycoazobenzene alkanethioacetate was also prepared. Scope and limitations of late‐stage C–H chlorination of sugar derivatives is
the concentration of sulfuricacid. Treatment of 4-haloazoxybenzenes with sulfuricacid gave 4-(p-halophenylazo)phenols and 4-haloazobenzenes (13) as major products together with 2-(p-halophenylazo)phenols and 5-halo-2-(phenylazo)phenols as minor products. Yields of reduction products 6 and 13 increased as the halosubstituent became heavier in the following sequence: F→Cl→Br→I.
New Generation of Nitrite Functionalized Star-like Polyvinyl Imidazolium Compound: Application as a Nitrosonium Source and Three Dimensional Nanocatalyst for the Synthesis of Azo Dyes
Background: The compounds with three-dimensional and ionic structures have attracted
considerable attentions because of their unique characteristics as a drug carrier and catalyst. Star-like
poly ionic compounds are a new generation of three-dimensional structures which have both; the exclusive
ionic features and three-dimensional structures. Recently, we reported the synthesis of diazonium
salts from aniline derivatives using carboxyl and nitrite functionalized graphene quantum dots.
Methods: Nitrite-functionalized star-like polyionic (NFSP) compound was synthesized as a new generation
of three-dimensional nanocatalyst. Herein, the use of NFSP as an efficient reagent and nanocatalyst
for the diazotization of aniline derivatives and subsequent synthesis of azo dyes via the reaction
with active phenolates under solvent-free conditions was reported.
Results: In order to demonstrate the positive impact of NFSP efficiency, the reaction times and yields
of the products were compared with other methods and catalysts which have been reported previously.
The brilliant performance of NFSP can be ascribed to multifunctional reagent and also trapping the ingredient
within catalyst cavities.
Conclusion: A highly effective and cost-effective method has been developed for the preparation of
azo dyes. In reported method, new three-dimensional catalyst with highly ionic characteristic and multifunctional
nitrosonium source is available. These special features reduced the required amount of
catalyst, reaction time and also increased the efficiency of catalyst.
PEGylated AIEgen molecular probe for hypoxia-mediated tumor imaging and photodynamic therapy
作者:Jun Li、Wei Liu、Zuhao Li、Yingcai Hu、Jinfeng Yang、Jishan Li
DOI:10.1039/d1cc00967b
日期:——
We report a novel PEGylated aggregation-inducedemission luminogen (AIEgen) molecular probe for hypoxia-mediated tumor imaging and photodynamictherapy by linking a PEG chain to the AIE-active photosensitizer via a hypoxia-sensitive azo group.
DICHROIC DYE COMPOUND, POLARIZING FILM, AND USES THEREOF
申请人:Sumitomo Chemical Company, Limited
公开号:US20170226071A1
公开(公告)日:2017-08-10
A compound having a maximum absorption in a wavelength range of 350 nm to 550 nm that functions as a dichroic dye is provided. In particular, a compound represented by formula (1) is provided. In the compound of formula (1), R
1
represents an alkyl group having 1 to 20 carbon atoms or the like; R
2
represents an acyl group having 1 to 20 carbon atoms or the like; R
3
represents a hydrogen atom or the like; and Y represents a group of formula (Y1). In the formula (Y1), * represents a bonding site with N, or a group of formula (Y2). In the formula (Y2), * represents a bonding site with N; P
1
and P
2
each independently represent —S— or the like; and Q
1
and Q
2
each independently represent ═N— or the like.