The synthesis of a variety of diarylethenes through the SuzukiâMiyaura coupling reaction of 1,2-dichlorohexafluorocyclopentene with arylboronic acids and esters has been developed. Thiophenes with various substituents such as cyano and ester functionalities can be incorporated.
organolithium reagents gave the corresponding symmetrical disubstituted perfluorocyclopentenes in good to high yields. The reaction with Grignard reagents led to the monosubstituted perfluorocyclopentenes, which were subjected to the further nucleophilic substitution reaction using another Grignard or aryllithium reagents, unsymmetrical disubstituted perfluorocyclopentenes being obtained in high yields
Synthesis of photochromic diarylethenes using a microflow system
作者:Yousuke Ushiogi、Tomoyuki Hase、Yoshiharu Iinuma、Atsushi Takata、Jun-ichi Yoshida
DOI:10.1039/b702277h
日期:——
An effective method for the synthesis of photochromicdiarylethenes based on microflow systems has been developed, and the synthesis of unsymmetrical diarylethenes which is difficult to achieve using conventional macro batch systems, has been accomplished.
1-bromononafluorocyclohexeneand 1-bromoheptafluorocyclopentene undergo reductivecoupling reactions when heated with copper bronze to give 1,4-dichlorotetrafluorobuta-1,3-diene and perfluorobicyclo-hex-1,1′-enyl and -pent-1,1′-enyl, respectively. The same olefins undergo crossed coupling reactions with phenyl and pentafluorophenyl halides and, in the first case, with 1-iodoheptafluoropropane.