Hydroxyl-containing compounds are highly value-added organic molecules, and the establishment of novel methodologies for their elaboration is a long-standing challenge in organic synthesis. Here the first oxone-mediated direct arylhydroxylation of activated alkenes was developed for the synthesis of valuable hydroxyl-containing oxindoles and 3,4-dihydroquinolin-2-ones. The products were controlled
In this paper, a one-pot facile route for the BiCl3/RuCl3-mediated synthesis of functionalized flavones is described, including: (i) intermolecular ortho-acylation of substituted phenols with cinnamoyl chlorides, and (ii) intramolecular cyclodehydrogenation of the resulting o-hydroxychalcones. The reaction conditions are discussed herein.
Tandem Spirocyclopropanation/Rearrangement Reaction of Vinyl <i>p</i>-Quinone Methides with Sulfonium Salts: Synthesis of Spirocyclopentenyl <i>p</i>-Dienones
作者:Xiang-Zhi Zhang、Yu-Hua Deng、Kang-Ji Gan、Xu Yan、Ke-Yin Yu、Fang-Xin Wang、Chun-An Fan
DOI:10.1021/acs.orglett.7b00516
日期:2017.4.7
A novel base-mediated tandem spirocyclopropanation/rearrangement reaction of vinyl p-quinone methides (p-VQMs) with sulfonium salts is described. The unprecedented reactivity of p-VQMs was explored for the first time in the spiroannulation cascade, providing a stereoselective approach to the construction of synthetically interesting, densely functionalized spirocyclopentenyl p-dienones.
Cascade synthesis of new tetracyclic heteroaromatic thieno[2,3-b]pyridine-containing ring systems
作者:R. Alan Aitken、Alasdair N. Garnett
DOI:10.1039/b9nj00528e
日期:——
appropriate stabilised ylides, prepared in a few steps from 2-(methylthio)nicotinic acid, give products containing previously unknown naphtho-, phenanthro-, benzothieno- and benzofuro-fused thieno[2,3-b]pyridineringsystems.
快速真空热解适当的稳定化的碘化物,可通过以下步骤制备 2-(甲硫基)烟酸,提供含有以前未知的萘,菲,苯并噻吩并和苯并呋喃稠合的产品 噻吩并[2,3- b ]吡啶 环系统。
Delayed activity supported olefin polymerization catalyst compositions and method for making and using the same
申请人:BP Chemical Limited
公开号:US20040235646A1
公开(公告)日:2004-11-25
The invention provides supported catalyst and methods for making and using the same, which are characterized as employing organometallic Group 4-10 catalysts with specially selected dienes, which, when combined with a cocatalyst, result in a supported catast which has improved kinetic profiles in the gas polymerization process.