Synthesis of ubiquinone and menaquinone analogues by oxidative demethylation of alkenylhydroquinone ethers with argentic oxide or ceric ammonium nitrat
作者:L. Syper、K. Kloc、J. Mz.xl;lochowski
DOI:10.1016/0040-4020(80)85034-4
日期:1980.1
It was found that alkenylhydroquinone ethers demethylated with argenticoxide or ceric ammonium nitrate in the presence of 2,4,6-pyridinetricarboxylic acid as a catalyst and afforded ubiquinone-2, menaquinone-2 and their analogs in yields of 53 to 89%. The new approach to the synthesis of starting alkenylhydroquinone ethers as well as 2,4,6-pyridinetricarboxylic acid and its derivatives has been reported
[EN] QUINONE BASED NITRIC OXIDE DONATING COMPOUNDS FOR OPHTHALMIC USE<br/>[FR] COMPOSÉS DONNEURS D'OXYDE NITRIQUE À BASE DE QUINONE POUR UNE UTILISATION OPHTALMIQUE
申请人:NICOX SA
公开号:WO2014063923A1
公开(公告)日:2014-05-01
The present invention relates to novel nitric oxide donor compounds for the use in the treatment and/or prophylaxis of hypertensive glaucoma, normotensive glaucoma and ocular hypertension.
Synthesis of Vitamin K and Related Naphthoquinones via Demethoxycarbonylative Annulations and a Retro-Wittig Rearrangement
作者:Dipakranjan Mal、Ketaki Ghosh、Supriti Jana
DOI:10.1021/acs.orglett.5b02920
日期:2015.12.4
Anionic annulations of 3-nucleofugal phthalides with α-alkyl(aryl)acrylates involving a demethoxycarbonylation provide a succinct synthesis of vitamin K and related naphthoquinones. Also reported is a new cascade reaction stemming from a Cope–retro-Wittig rearrangement. This cascade leads to direct formation of 1-hydroxy-4-prenyloxynaphthalene-2-carboxylates from the corresponding α-prenyl acrylate
Bismuth-catalyzed methylation and alkylation of quinone derivatives with tert-butyl peroxybenzoate as an oxidant
作者:Jian Yang、Yu Dong、Shuai He、Zhi-Chuan Shi、Yu Wang、Ji-Yu Wang
DOI:10.1016/j.tet.2019.130729
日期:2019.12
radical reaction mechanism. Particularly, TBPB was used not only as an efficient oxidant, but also as a green methyl source in such transformation. Moreover, this method could also be efficiently extended to the alkylation of quinones. This reaction tolerated a series of functional groups and prepared a series of derivatives of vitamin K3 and benzoquinone. Notably, antimalarial parvaquone was synthesized
Allylation of Quinones via Photoinduced Electron-Transfer Reactions from Allylstannanes
作者:Kazuhiro Maruyama、Hiroshi Imahori
DOI:10.1246/bcsj.62.816
日期:1989.3
Photochemical reactions of quinones with allylstannanes provided four types of products: adducts of allyl group to the carbonyl oxygens of quinones, adducts of allyl group to the olefinic carbons, adducts of allyl group to the carbonyl carbons, and hydroquinones. An electron-transfer mechanism was confirmed by 1H-CIDNP (Chemically Induced Dynamic Nuclear Polarization) method. This study suggests that
醌与烯丙基锡烷的光化学反应提供了四种类型的产物:烯丙基与醌的羰基氧的加合物、烯丙基与烯烃碳的加合物、烯丙基与羰基碳的加合物和对苯二酚。通过1H-CIDNP(化学诱导动态核极化)方法证实了电子转移机制。该研究表明 a) 从烯丙基锡烷到醌的光致电子转移产生相应的醌阴离子自由基和锡阳离子自由基,b) 锡阳离子自由基裂解产生烯丙基自由基和锡阳离子,以及 c) 烯丙基自由基攻击醌阴离子自由基导致最终产物烯丙基化醌的形成。