Electrochemical Vicinal Difluorination of Alkenes: Scalable and Amenable to Electron‐Rich Substrates
作者:Sayad Doobary、Alexi T. Sedikides、Henry P. Caldora、Darren L. Poole、Alastair J. J. Lennox
DOI:10.1002/anie.201912119
日期:2020.1.13
oxidative difluorination of alkenes represents an important strategy for their preparation, yet current methods are limited in their alkene-types and tolerance of electron-rich, readily oxidized functionalities, as well as in their safety and scalability. Herein, we report a method for the difluorination of a number of unactivated alkene-types that is tolerant of electron-rich functionality, giving products
Metal-Free β-Amino Alcohol Synthesis: A Two-step Smiles Rearrangement
作者:Di Yang、Cai-Xia Xie、Xiao-Tian Wu、Luo-Ran Fei、Lei Feng、Chen Ma
DOI:10.1021/acs.joc.0c01543
日期:2020.12.4
A novel method for the synthesis of β-amino alcohols has been demonstrated under mild reaction conditions with a broad scope via a two-step Smiles rearrangement. What is more, theoretical calculations have been performed to confirm the rationality of the mechanism. The method has been proved to be notably effective for N-arylated amino alcohols, which are difficult to synthesize by traditional methods
Enantioselective Desymmetrization of Cyclobutanones Enabled by Synergistic Palladium/Enamine Catalysis
作者:Meng Wang、Jun Chen、Zongjia Chen、Changxu Zhong、Ping Lu
DOI:10.1002/anie.201711845
日期:2018.3.1
The enantioselective intramolecular α‐arylation of cyclobutanones has been established by combining palladium and enamine catalyst systems. Two different enantioselective control strategies have been developed for cyclobutanone substrates bearing O‐ or N‐tethered aryl bromides. Further synthetic applications are also reported.
Pd/Xiang-Phos-catalyzed enantioselective intermolecular carboheterofunctionalization of norbornene and norbornadiene
作者:Mengna Tao、Wenbo Li、Junliang Zhang
DOI:10.1039/d0cc04996d
日期:——
to various chiral norbornane-fused dihydrofurans and dihydro-pyrroles. This synthetic methodology provides the first example of asymmetric carboetherification of norbornene, and also tolerates norbornadiene well.
Base‐Promoted Michael Addition/Smiles Rearrangement/
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‐Arylation Cascade: One‐Step Synthesis of 1,2,3‐Trisubstituted 4‐Quinolones from Ynones and Sulfonamides
synthesize 1,2,3‐trisubstituted 4‐quinolones from readily available ynones and sulfonamides was developed. The construction of one C−C bond and two C−N bonds via cleavage of one N−S, one C−S, and one C−X (X=F, Cl, Br, O) bond is achieved under transition‐metal‐free conditions in onestep. This transformation generates 1 equiv. of sulfur dioxide and 1 equiv. of hydrogen halide as the byproducts. The broad substrate