Synthesis of 1,3-Dialkyl-1,2,3-triazolium Ionic Liquids and Their Applications to the Baylis−Hillman Reaction
作者:Yunkyung Jeong、Jae-Sang Ryu
DOI:10.1021/jo100618d
日期:2010.6.18
Novel 1,3-dialkyl-1,2,3-triazolium ionic liquids were synthesized via click reactions using 1-trimethylsilylacetylene and alkyl azides and were efficient reaction media for the Baylis−Hillman reaction. The problems associated with deprotonation of the C-2 hydrogen of [bmim][PF6] could be suppressed in the reaction of [bmTr][PF6] or [bmTr][NTf2]. 1,3-Dialkyl-1,2,3-triazolium ionic liquids are chemically
Direct Synthesis of Dihydropyrrolo[2,1‐
<i>a</i>
]Isoquinolines through FeCl
<sub>3</sub>
Promoted Oxidative Aromatization
作者:Hai‐Lei Cui、Lu Jiang、Hao Tan、Si Liu
DOI:10.1002/adsc.201900756
日期:2019.10.22
We have developed a straightforward FeCl3 promoted synthesis of dihydropyrrolo[2,1‐a]isoquinolinesthrough formal (3+2) cycloaddition/oxidative aromatization cascade of dihydroisoquinoline with Morita‐Baylis‐Hillman carbonates (up to 96% yield). Further modifications of the obtained products were successful through simple chemical transformations providing a diverse range of natural product‐like molecules
我们已经开发出一种简单的FeCl 3促进的二氢吡咯并[2,1- a ]异喹啉的合成,方法是通过二氢异喹啉与Morita-Baylis-Hillman碳酸盐的正式(3 + 2)环加成/氧化芳构化级联(产率高达96%)。通过简单的化学转化成功获得了进一步的修饰产物,提供了多种天然产物样分子(12个例子)。
Dess-Martin Periodinane Promoted Oxidative Coupling of Baylis-Hillman Adducts with Silyl Enol Ethers: A Novel Synthesis of <i>cis</i>-Fused Dihydropyrans
enol ethers in the presence of Dess-Martin periodinane (DMP) and pyridine under mild reaction conditions to afford a new class of dihydropyranderivatives in good yields with high diastereoselectivity. This is the first report on the preparation of cis-fused dihydropyransfrom Baylis-Hillman adducts and silyl enol ethers.
Anti-Selective Epoxidation of Methyl α-Methylene-β-<i>tert</i>-butyldimethylsilyloxycarboxylate Esters. Evidence for Stereospecific Oxygen Atom Transfer in a Nucleophilic Epoxidation Process
作者:Jakub Švenda、Andrew G. Myers
DOI:10.1021/ol900665a
日期:2009.6.4
Methyl α-methylene-β-tert-butyldimethylsilyloxycarboxylate esters are found to undergo diastereoselective epoxidation in the presence of potassium tert-butoxide−tert-butyl hydroperoxide to form anti products. In an effort to better understand mechanistic details of the transformation and the basis of diastereoselectivities observed, we studied the epoxidation of substrates with α-methylene groups containing
An efficient and practical protocol for the highly selective preparation of substituted allyl sulfones has been developed. Arenesulfonyl cyanides, Baylis–Hillman adducts, and simple allylic alcohols give an unforeseen outcome (see scheme).