Molecular photoswitches have attracted much attention in biological and materials contexts. Despite the fact that existing classes of these highly interesting functional molecules have been heavily investigated and optimized, distinct obstacles and inherent limitations remain. Considerable synthetic efforts and complex structure property relationships render the development and exploitation of new photoswitch families difficult. Here, we focus our attention on acylhydrazones: a novel, yet underexploited class of photochromic molecules based on the imine structural motif. We optimized the synthesis of these potent photoswitches and prepared a library of over 40 compounds, bearing different substituents in all four crucial positions of the backbone fragment, and conducted a systematic study of their photochromic properties as a function of structural variation. This modular family of organic photoswitches offers a unique combination of properties and the compounds are easily prepared on large scales within hours, through an atom-economic synthesis, from commercially available starting materials. During our thorough spectroscopic investigations, we identified photoswitches covering a wide range of thermal half-lives of their (Z)-isomers, from short-lived T-type to thermally stable P-type derivatives. By proper substitution, excellent band separation between the absorbance maxima of (E)- and (Z)-isomers in the UV or visible region could be achieved. Our library furthermore includes notable examples of rare negative photochromic systems, and we show that acylhydrazones are highly fatigue resistant and exhibit good quantum yields.
Molecular photoswitches have attracted much attention in biological and materials contexts. Despite the fact that existing classes of these highly interesting functional molecules have been heavily investigated and optimized, distinct obstacles and inherent limitations remain. Considerable synthetic efforts and complex structure property relationships render the development and exploitation of new photoswitch families difficult. Here, we focus our attention on acylhydrazones: a novel, yet underexploited class of photochromic molecules based on the imine structural motif. We optimized the synthesis of these potent photoswitches and prepared a library of over 40 compounds, bearing different substituents in all four crucial positions of the backbone fragment, and conducted a systematic study of their photochromic properties as a function of structural variation. This modular family of organic photoswitches offers a unique combination of properties and the compounds are easily prepared on large scales within hours, through an atom-economic synthesis, from commercially available starting materials. During our thorough spectroscopic investigations, we identified photoswitches covering a wide range of thermal half-lives of their (Z)-isomers, from short-lived T-type to thermally stable P-type derivatives. By proper substitution, excellent band separation between the absorbance maxima of (E)- and (Z)-isomers in the UV or visible region could be achieved. Our library furthermore includes notable examples of rare negative photochromic systems, and we show that acylhydrazones are highly fatigue resistant and exhibit good quantum yields.
Mild, Stereoselective, and Highly Efficient Synthesis of<i>N</i>-Acylhydrazones Mediated by CeCl<sub>3</sub>·7H<sub>2</sub>O in a Broad Range of Solvents
作者:José Maurício dos Santos Filho
DOI:10.1002/ejoc.201402609
日期:2014.10
This method uses a minimal catalytic amount of cerium(III), is stereoselective, and offers several unique features, such as compatibility with aryl, heterocyclic, alkenyl, and sensitive functional groups as well as the ability to prepare N-acylhydrazones from highly hindered substrates. More strikingly, cerium(III) efficiently mediated the reaction with less reactive substrates such as diaryl and alkyl
Novel mandelic hydrazides of the formula (I), in which R
1
-R
11
have the meanings indicated in claim 1, are SGK inhibitors and can be used for the treatment of SGK-induced diseases and complaints, such as diabetes, obesity, metabolic syndrome (dyslipidaemia), systemic and pulmonary hypertonia, cardiovascular diseases and kidney diseases, generally in fibroses and inflammatory processes of any type.
[EN] THE EXOCYST AS A NOVEL DRUG TARGET OF ENDOSIDIN2 AND APPLICATION AS A THERAPEUTIC<br/>[FR] L'EXOKYSTE EN TANT QUE NOUVELLE CIBLE DE MÉDICAMENT DE L'ENDOSIDINE-2 ET APPLICATION THÉRAPEUTIQUE
申请人:UNIV CALIFORNIA
公开号:WO2017049016A1
公开(公告)日:2017-03-23
A method of altering exocytosis in a plant or animal cell is provided. The method includes exposing the cell to a compound that binds to an EXO70 protein isoform. Also provided is a method of treating diabetes or cancer in a subject in need thereof, which includes administering to the subject an effective amount of a compound that binds to an EXO70 protein isoform. In addition, a method of screening for a substance that alters exocytosis in a plant or animal cell is provided, and analogs of compound Endosidin2 are also provided.
Synthesis of 1,3-Disubstituted <i>N</i>-Amino-1,2,3,4-tetrahydroisoquinolines
作者:Kang Zhao、Li Zhang、Xiu-Fang Zheng、Gregory Linn
DOI:10.1055/s-2007-967948
日期:2007.2
The synthesis of 1,3-disubstituted N-amino-1,2,3,4-tetrahydroisoquinolines from the corresponding hydrazide intermediate via Pictet-Spengler reaction is described and the effect of the aldehyde on the stereoconfiguration of the products is discussed.