人们对将常见化学过程从有机溶剂转移到水的兴趣不断浓厚,这对于生物启发和绿色化学技术的发展至关重要。二芳基乙烯具有丰富的光化学特性,包括有机合成、材料化学和光药理学所需的不可逆和可逆反应。在此,我们介绍了第一类多功能二芳基乙烯,即 2,3-二芳基马来酸钾 (DAM),它在水中表现出优异的溶解度。从高度可用的前体获得的 DAM 在水中具有全谱光活性,并根据其结构进行不可逆反应(氧化环化或重排)或可逆光环化(转换)。这一发现为二芳基乙烯在光药理学和需要水介质进行光化学反应的生物启发技术中的更广泛应用铺平了道路。
Solid‐Phase Conversion of Four Stereoisomers into a Single Enantiomer
作者:Anthonius H. J. Engwerda、Johannes C. J. Mertens、Paul Tinnemans、Hugo Meekes、Floris P. J. T. Rutjes、Elias Vlieg
DOI:10.1002/anie.201808913
日期:2018.11.19
has remained limited to molecules with a single stereocenter. We show here that this method can be extended to obtain a single enantiomer from a mixture of stereoisomers with two different stereocenters. In addition, we show that by using tailor‐made chiral additives, the conversion time can be reduced by a factor of 100.
A simple and general method has been developed for the synthesis of 3,4-diarylsubstituted maleic anhydride and maleimide through tandem cyclization and oxidation reaction of phenacyl ester or amide. A wide variety of phenacyl esters or amides was treated with DBU under oxygen atmosphere to give the expected compounds in good to excellent yield. Mechanism of the reaction and application of the methodology
Synthese de N-amino maléimides et d'anhydrides maléiques disubstitués à partir d'α-halogéno hydrazides. Etude du mécanisme de la réaction
作者:C. Florac、M. Baudy-Floc'h、A. Robert
DOI:10.1016/s0040-4020(01)85428-4
日期:1990.1
α-halohydrazides react with 2-amino pyridine to give symetrically substituted N-amino maleimides. We have shown that this reaction proceeds through the formation of 4-hydroxy imidazopyridines. This result open a new route to dissymetrically substituted N-amino maleimides. The hydrolysis of N-amino maleimides is a good route to substituted maleic anhydrides.