K<sub>2</sub>S<sub>2</sub>O<sub>8</sub>-Mediated Difunctionalization of C≡C Bonds in Water: A Simple and Efficient Approach to <font>α</font>,<font>α</font>-Dihaloacetophenones from Phenylacetylenes and NaX
作者:Jing-Yu Wang、Qing Jiang、Can-Cheng Guo
DOI:10.1080/00397911.2014.928938
日期:2014.11.2
Abstract A novel K2S2O8-mediated oxy-1,1-dihalogenation of alkynes with NaX in the presence of water has been developed, affording α,α-dihaloacetophenones in moderate to good yields. The advantages of this reaction are mild reaction conditions, operational simplicity, and use of pure water as reaction medium. A plausible reaction mechanism is proposed on the basis of mechanistic studies. GRAPHICAL
A Coupling Approach for the Generation of α,α-Bis(enolate) Equivalents: Regioselective Synthesis of <i>gem</i>-Difunctionalized Ketones
作者:Carmelo E. Iacono、Thomas C. Stephens、Teena S. Rajan、Graham Pattison
DOI:10.1021/jacs.7b12941
日期:2018.2.14
Regioselective α,α-difunctionalization adjacent to a ketone is a significant synthetic challenge. Here, we present a solution to this problem through the transition-metal-free coupling of esters with geminal bis(boron) compounds. This forms an α,α-bis(enolate) equivalent which can be trapped with electrophiles including alkyl halides and fluorinating agents. This presents an efficient, convergent synthetic
Conversion of Alkynes into α,α-Dichloro Ketones and α,α-Dichlorodimethyl Ketals Using Trichloroisocyanuric Acid
作者:Gene A. Hiegel、Christopher D. Bayne、Brendt Ridley
DOI:10.1081/scc-120021025
日期:2003.7
Abstract Trichloroisocyanuric acid reacts with alkynes in the presence of water in acetone or acetonitrile to form α,α-dichloro ketones and in methanol to form α,α-dichlorodimethyl ketals.
One-pot Synthesis of α,α-Dichloroketones from Alkynes Using the N,N-Dimethylformamide/HCl/Potassium Monoperoxysulfate System
作者:Kye Kwang Kim、Jae Nyoung Kim、Kyoung Mahn Kim、Hyoung Rae Kim、Eung K. Ryu
DOI:10.1246/cl.1992.603
日期:1992.4
The reaction of alkynes with N,N-dimethylformamide (DMF)/HCl/potassium monoperoxysulfate (Oxone, Aldrich) afforded the corresponding α,α-dichloroketones in good yields.
Reactivity of n-aryl-α, α-dichlorinated arylketimines
作者:Norbert De Kimpe、Roland Verhé、Laurent De Buyck、Sunari Tukiman、Niceas Schamp
DOI:10.1016/0040-4020(79)80096-4
日期:1979.1
α-dichloroalkylarylketimines are formed from N-aryl-alkylarylketimines with N-chloro succinimide in carbon tetrachloride. Reaction of N-1-(2,2-dichlor-1-arylpropylidene)anilines with sodiummethoxide the latter compounds formally involves migration of the notrogen atom from the 1- to the 3-position. The reaction of higher substituted N-aryl-α,α-dichloroalkylarylketimines with sodiummethoxide leads mainly to α-chloro-α