Asymmetric Chlorination/Ring Expansion for the Synthesis of α-Quaternary Cycloalkanones
作者:Qin Yin、Shu-Li You
DOI:10.1021/ol5005565
日期:2014.3.21
A highly enantioselective chlorination/ringexpansion cascade for the construction of cycloalkanones with an all-carbon quaternary center was realized (up to 97% ee). Oxa-cyclobutanol substrates were employed for the first time in the ringexpansionreactions, affording the functionalized dihydrofuranones in excellent enantioselectivity.
Metal-Free Oxidative Decarboxylative Acylation/Ring Expansion of Vinylcyclobutanols with<i>α</i>-Keto Acids by Visible Light Photoredox Catalysis
作者:Jin-Jiang Zhang、Yuan-Bo Cheng、Xin-Hua Duan
DOI:10.1002/cjoc.201600729
日期:2017.3
A metal‐free visible‐light‐mediated decarboxylative acylation/ring expansion of vinylcyclobutanols with α‐keto acids has been developed. Hypervalent iodine reagent was found to be important for promoting decarboxylation of α‐keto acids in this tandem radical process. This protocol has been successfully applied to synthesis of a variety of substituted 1,4‐dicarbonyl compounds and tolerated some functional
α-Quaternary Mannich Bases through Copper-Catalyzed Amination-Induced 1,2-Rearrangement of Allylic Alcohols
作者:Wei-Zhi Weng、Jian-Guo Sun、Ping Li、Bo Zhang
DOI:10.1002/chem.201702428
日期:2017.7.21
A novel copper‐catalyzed amination‐induced 1,2‐rearrangement reaction of allylic alcohols has been developed under simple and mild conditions. The commercially available N‐fluorobenzenesulfonimide (NFSI) is employed as an amination reagent. In this transformation, not only alkyl, but also aryl substituents can efficiently undergo 1,2‐carbon atom migration, thereby providing an efficient and powerful
Azides are building blocks of increasing importance in synthetic chemistry, chemical biology, and materials science. Azidobenziodoxolone (ABX, Zhdankin reagent) is a valuable azide source, but its safety profile has not been thoroughly established. Herein, we report a safety study of ABX, which shows its hazardous nature. We introduce two derivatives, tBu-ABX and ABZ (azidobenziodazolone), with a better
Catalyst-free selenylation/semipinacol rearrangement cascades of alkenyl cyclobutanols: synthesis of β-selenylated cyclopentanones
作者:Dae Young Kim
DOI:10.1080/00397911.2019.1616762
日期:2019.9.2
access β-selenated cyclic ketone derivatives through the catalyst-free selenylation and semipinacol rearrangement sequence of 1-(1-arylvinyl)cyclobutanols was developed. This reaction employs the easily accessible and shelf-stable benzeneselenyl bromide as an electrophilic selenium source, and the reaction has advantages of mild reaction conditions and broad substrate scope. Graphical Abstract