Preparation of (Z)-α-chloro-α,β-unsaturated ketones with total or high diastereoselectivity
摘要:
(Z)-alpha-Chloroenones are obtained by reaction of alpha-chloro-beta-hydroxyketones with acetic anhydride, pyridine and 4-dimethylaminopyridine with total or high diastereoselectivity and in high yield. (C) 2002 Elsevier Science Ltd. All rights reserved.
Desulfurative Chlorination of Alkyl Phenyl Sulfides
作者:Daniele Canestrari、Stefano Lancianesi、Eider Badiola、Chiara Strinna、Hasim Ibrahim、Mauro F. A. Adamo
DOI:10.1021/acs.orglett.7b00077
日期:2017.2.17
The chlorination of readily available secondary and tertiary alkyl phenyl sulfides using (dichloroiodo)benzene (PhICl2) is reported. This mild and rapid nucleophilic chlorination is extended to sulfa-Michael derived sulfides, affording elimination-sensitive β-chloro carbonyl and nitro compounds in good yields. The chlorination of enantioenriched benzylic sulfides to the corresponding inverted chlorides
Reaction of Benzeneseleninyl Chloride with Olefins in the Presence of a Lewis Acid. A Novel One Step Vinylic Chlorination
作者:Nobumasa Kamigata、Takeshi Satoh、Masato Yoshida
DOI:10.1246/bcsj.61.449
日期:1988.2
In the presence of aluminum chloride benzeneseleninyl chloride was found to be an excellent vinylic chlorinating reagent of olefins under mild conditions. However, such olefins as styrene, trans-stilbene, and trans-1-phenylpropene afforded dichloro adducts under similar conditions. A plausible reaction mechanism involving positive chlorine intermediate is proposed.
Generation and Trapping of Cyclopropenes from 2-Alkoxy-1,1-dichlorocyclopropanes
作者:Paul Müller、Nicole Pautex
DOI:10.1002/hlca.19910740108
日期:1991.1.30
In presence of crown ether, 2-alkoxy-1,1-dichlorocyclopropanes react with t-BuOK/THF preferentially via ring opening to 2-chloroalk-2-en-1-ones and alkynones or to chlorocyclopropenes. The latter may be intercepted with 1,3-diphenylisobenzofuran, but in the absence of trapping agent, the rearrangement to vinylcarbenes does not occur.
Abstract The combination of diphenyl sulfoxide and oxalyl chloride was used to accomplish the dichlorination of olefins, in which chlorodiphenylsulfonium salt generated in situ was proposed to be the real active species as a chloronium ion source. Graphical Abstract
Halocarbocyclization versus dihalogenation: substituent directed iodine(<scp>iii</scp>) catalyzed halogenations
作者:Maciej Stodulski、Alissa Goetzinger、Stefanie V. Kohlhepp、Tanja Gulder
DOI:10.1039/c3cc49850f
日期:——
The nucleophilicity of the substituents in iodobenzene pre-catalysts have a huge impact on product selectivity in iodine(III) triggered halogenations, steering the reactivity from solely carbocyclizations towards dihalogenations. Utilizing this catalyst-dependent reactivity a diastereo- and chemoselective dihalogenation method was established allowing the conversion of structurally and electronically