Three component hydroxyletherification and hydroxylazidation of (trifluoromethyl)alkenes: access to α-trifluoromethyl β-heteroatom substituted tertiary alcohols
The three component hydroxyletherification and hydroxylazidation reactions of (trifluoromethyl)alkenes are reported, providing various useful α-trifluoromethyl β-heteroatom substituted tertiary alcohols in high yields.
Copper‐Catalyzed 1,2‐Bistrifluoromethylation of Terminal Alkenes
作者:Hyunseok Oh、Areum Park、Kyu‐Sung Jeong、Soo Bong Han、Hyuk Lee
DOI:10.1002/adsc.201801675
日期:2019.4.23
to alkenes is well known, and many components such as azides, cyanides, amines, and halides have been inserted into alkenes with CF3. However, to date the double catalytic insertion of CF3 into an alkene is unknown. Herein, we report the catalytic 1,2‐bistrifluoromethylations of alkenes catalyzed by Copper (Cu). We used two CF3 sources, namely Umemoto's reagent and (trifluoromethyl)trimethylsilane
Palladium-catalyzed aerobic regio- and stereo-selective olefination reactions of phenols and acrylates<i>via</i>direct dehydrogenative C(sp<sup>2</sup>)–O cross-coupling
作者:Yun-Bin Wu、Dan Xie、Zhong-Lin Zang、Cheng-He Zhou、Gui-Xin Cai
DOI:10.1039/c8cc01226a
日期:——
An efficient olefination protocol for the oxidative dehydrogenation of phenols and acrylates has been achieved using a palladium catalyst and O2 as the sole oxidant. This reaction exhibits high regio- and stereo-selectivity (E-isomers) with moderate to excellent isolated yields and a wide substrate scope (32 examples) including ethyl vinyl ketone and endofolliculina.
Quantum Dot‐Catalyzed Photoreductive Removal of Sulfonyl‐Based Protecting Groups
作者:Kaitlyn A. Perez、Cameron R. Rogers、Emily A. Weiss
DOI:10.1002/anie.202005074
日期:2020.8.10
of aryl sulfonyl‐protected phenols. For a series of aryl sulfonates with electron‐withdrawing substituents, the rate of deprotection for the corresponding phenyl aryl sulfonates increases with decreasing electrochemical potential for the two electron transfers within the catalytic cycle. The rate of deprotection for a substrate that contains a carboxylic acid, a known QD‐binding group, is accelerated
Regio‐ and Stereoselective Synthesis of Enynyl‐Aryl Ethers Enabled by Copper/Iodide Tandem Catalysis
作者:Yun‐Bin Wu、Lin Xiao、Chun‐Li Mao、Zhong‐Lin Zang、Cheng‐He Zhou、Gui‐Xin Cai
DOI:10.1002/adsc.201900626
日期:2019.10.8
An approach to preparing enynyl‐aryl ethers from phenols and phenylacetylenes is described. This method without extra ligands, overcoming the favored Glaser‐Hay dimerization of alkyne, features a wide substrate scope (38 examples including endofolliculina and indole) and the merits of high atom and step economy, good regio‐ and stereoselectivity (Z‐isomers major) in moderate to good isolated yields