Direct Conversion of Alcohols to α-Chloro Aldehydes and α-Chloro Ketones
作者:Yuanyuan Jing、Constantin G. Daniliuc、Armido Studer
DOI:10.1021/ol5024568
日期:2014.9.19
Direct conversion of primary and secondary alcohols into the corresponding α-chloro aldehydes and α-chloro ketones using trichloroisocyanuric acid, serving both as stoichiometric oxidant and α-halogenating reagent, is reported. For primary alcohols, TEMPO has to be added as an oxidation catalyst, and for the transformation of secondary alcohols (TEMPO-free protocol), MeOH as an additive is essential
Cross-Coupling Reaction of α-Chloroketones and Organotin Enolates Catalyzed by Zinc Halides for Synthesis of γ-Diketones
作者:Makoto Yasuda、Shoki Tsuji、Yusuke Shigeyoshi、Akio Baba
DOI:10.1021/ja0258172
日期:2002.6.1
catalyzed by zinc halides. In contrast to the exclusive formation of 1,4-diketones 3 under catalytic conditions, uncatalyzed reaction of 1 with 2 gave aldol-type products 4 through carbonyl attack. NMR study indicates that the catalyzed reaction includes precondensation between tin enolates and α-haloketones providing an aldol-type species and their rearrangement of the oxoalkyl group with leaving halogen
Catalytic Effect of Five-Coordinate Organotin Bromide or Tetraphenylstibonium Bromide on the Chemo- and Stereoselective Addition of Tin Enolate to<i>α</i>-Halo Ketone
tetraphenylstibonium bromide, similarly promoted the selective addition of tin enolates to the carbonyl moiety in α-halo ketones. The reaction with 2-chlorocyclohexanones and the enolates gave chlorohydrins bearing chloro- and hydroxyl groups in the cis-conformation. Chemoselective carbonyl addition to acyclic α-halo ketones was followed by effective cyclization to 2-(2-oxoethyl)oxiranes. The structural and bonding
Efficient α-chlorination of carbonyl containing compounds under basic conditions using methyl chlorosulfate
作者:Saúl Silva、Christopher D. Maycock
DOI:10.1016/j.tetlet.2018.02.036
日期:2018.3
An efficient method for the α-chlorination of ketonesunder basic conditions is described using methyl chlorosulfate. Its applicability for the chlorination of other functional groups has also been studied and it is equally useful for the synthesis of α-chloroesters and amides. Methyl chlorosulfate is described for the first time as a positive chlorine source. Some aldol reactions which occur during
α-Chlorination of ketones using p-toluenesulfonyl chloride
作者:Kay M. Brummond、Kirsten D. Gesenberg
DOI:10.1016/s0040-4039(99)00213-0
日期:1999.3
Treatment of a variety of ketones with lithium diisopropylamide followed by p-toluenesulfonylchloride gives α-chloroketones in good yields. In addition, a polymer tosyl chloride reagent has also been shown to effect this transformation.