Antifungal 3,5-disubstituted furanones: From 5-acyloxymethyl to 5-alkylidene derivatives
作者:Petr Šenel、Lucie Tichotová、Ivan Votruba、Vladimír Buchta、Marcel Špulák、Jiří Kuneš、Milan Nobilis、Ondřej Krenk、Milan Pour
DOI:10.1016/j.bmc.2010.01.030
日期:2010.3
parent furanone structure were therefore prepared and evaluated. In line with the ease of elimination of the substituent from C5, low activities of the 5-alkoxy compounds were observed. On the other hand, their 5-aryloxymethyl congeners were found to be capable of liberating the antifungally active 5-methylene furanone into the testing medium. The antifungal effect of the 5-alkylidene derivatives was
PtI2-Catalyzed tandem 3,3-rearrangement/Nazarov reaction of arylpropargylic esters: synthesis of indanone derivatives
作者:Huaiji Zheng、Xingang Xie、Juan Yang、Changgui Zhao、Peng Jing、Bowen Fang、Xuegong She
DOI:10.1039/c1ob06138k
日期:——
An efficient PtI2-catalyzed tandem reaction of arylpropargylic esters, involving 3,3-rearrangement and Nazarov reaction, has been developed to produce 3-substituted and 3,3-disubstituted indanonederivatives. This approach provided a pathway to the synthesis of indanone skeletons in natural products.
Palladium-catalyzed one-pot synthesis of polysubstituted furans from alkynoates and 2-yn-1-ols
作者:Huawen Huang、Huanfeng Jiang、Hua Cao、Jinwu Zhao、Dabin Shi
DOI:10.1016/j.tet.2011.12.033
日期:2012.4
Easily accessible propargyl vinyl ethers are found to be acyclic precursors to construct furan derivatives. According to the reactive behavior of the substrates and the regulation of reaction conditions, three synthetic routes to polysubstituted furans via palladium-catalyzed reactions of propargyl vinyl ethers in situ-prepared from alkynoates and 2-yn-1-ols are presented herein. These methods could have potential application in synthetic and pharmaceutical chemistry for its facilitation and accessible starting materials. (C) 2011 Elsevier Ltd. All rights reserved.
Asymmetric Propargylic Radical Cyanation Enabled by Dual Organophotoredox and Copper Catalysis
The first asymmetric propargylic radical cyanation was realized through a dual photoredox and copper catalysis. An organic photocatalyst serves to both generate propargyl radicals and oxidize Cu(I) species to Cu(II) species. A chiral Cu complex functions as an efficient organometallic catalyst to resemble the propargyl radical and cyanide in an enantio-controlled manner. Thus, a diverse range of optically