作者:Richard O. C. Norman、William J. E. Parr、C. Barry Thomas
DOI:10.1039/p19760000811
日期:——
accounted for by a scheme in which gold(III) acts as an electrophile to give an organometallic adduct; this breaks down by heterolysis of the C–Au bond, accompanied by competition between rearrangement of a neighbouring substituent and uptake of a nucleophile. In all cases a close similarity was observed with the products obtained from oxidations by thallium(III) and lead(IV); where divergences occur
Merging shuttle reactions and paired electrolysis for reversible vicinal dihalogenations
作者:Xichang Dong、Johannes L. Roeckl、Siegfried R. Waldvogel、Bill Morandi
DOI:10.1126/science.abf2974
日期:2021.1.29
shuttle (e-shuttle) paradigm for the facile and scalable interconversion of alkenes and vicinal dihalides, a class of reactions that can be used both to synthesize useful dihalogenated molecules from simple alkenes and to recycle waste material through retro-dihalogenation. The reaction is demonstrated using 1,2-dibromoethane, as well as 1,1,1,2-tetrachloroethane or 1,2-dichloroethane, to dibrominate or
Direct Oxidation of Aryl Malononitriles Enabling a Copper-Catalyzed Intermolecular Alkene Carbochlorination
作者:Prakash Basnet、Gang Hong、Charles E. Hendrick、Marisa C. Kozlowski
DOI:10.1021/acs.orglett.0c03941
日期:2021.1.15
A copper-catalyzed carbochlorination of alkenes with aryl malononitriles and chloride is disclosed. This net oxidative transformation proceeds with activated and unactivated alkenes with moderate to excellent yields. Mechanism experiments suggest addition of the malononitrile radical to form a secondary carbon radical which is intercepted by a chloride source. The resultant products can be transformed
Continuous Flow Organocatalytic Chlorination of Alkenes
作者:Nicolaos S. Iordanidis、Alexandros L. Zografos、John K. Gallos、Theocharis V. Koftis、Christos I. Stathakis
DOI:10.1002/ejoc.202100912
日期:2021.9.24
A continuous flow-friendly organocatalyticchlorination of alkenes has been developed. The method implicates the catalytic system PhS(O)Me/TMSCl and makes use of environmentally benign H2O2, as the stoichiometric regenerator of the sulfoxide catalyst. Under these conditions, internal disubstituted and terminal alkenes cleanly convert to the corresponding anti-dichlorides, while electron rich trisubstituted
已经开发了连续流动友好的烯烃有机催化氯化。该方法涉及催化系统 PhS(O)Me/TMSCl,并利用环境友好的 H 2 O 2作为亚砜催化剂的化学计量再生器。在这些条件下,内部二取代和末端烯烃干净地转化为相应的反二氯化物,而富电子的三取代或 1,1-二取代烯烃提供烯丙基氯化产物。
Difunctionalization of Alkenes Using 1-Chloro-1,2-benziodoxol-3-(1<i>H</i>)-one
the reaction was operated in water. Dichlorination occurred in the presence of a Lewis basic promoter, such as 4-phenylpyridine N-oxide, as an additive. The reaction with in situ-generated azido anion afforded azidochlorinated compounds with a chlorineatom at the terminal position, while the reaction with trimethylsilyl isothiocyanate produced chlorothiocyanation adducts with a chlorineatom at the