2004
DOI: 10.3390/90100001
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Hexachloroacetone as a Precursor for a Tetrachloro-substituted Oxyallyl Intermediate: [4+3] Cycloaddition to Cyclic 1,3-Dienes

Abstract: Abstract:The enol phosphate 2,2-dichloro-1-(trichloromethyl)ethenyl diethyl phosphate (1), easily available by a Perkow reaction between hexachloroacetone and triethyl phosphite, reacts with sodium trifluoroethoxide/trifluoroethanol in the presence of cyclic 5-membered 1,3-dienes to furnish α,α,α',α'-tetrachloro-substituted

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Cited by 9 publications
(5 citation statements)
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“…6 Also, HCA was found to be a precursor for formation of a,a,a 0 ,a 0 -tetrachloro-substituted[3.2.1]bicyclic compounds. 7 This Letter reports on our initial studies involving the use of an HCA analog, hexabromoacetone, HBA, as an alternative tribromoacylating agent for both primary alcohols and amines, and as a mediator in the conversion of carboxylic acids into amides in the presence of triphenylphosphine. HBA is not commercially available, but it is easily prepared via the Gilbert's method.…”
mentioning
confidence: 99%
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“…6 Also, HCA was found to be a precursor for formation of a,a,a 0 ,a 0 -tetrachloro-substituted[3.2.1]bicyclic compounds. 7 This Letter reports on our initial studies involving the use of an HCA analog, hexabromoacetone, HBA, as an alternative tribromoacylating agent for both primary alcohols and amines, and as a mediator in the conversion of carboxylic acids into amides in the presence of triphenylphosphine. HBA is not commercially available, but it is easily prepared via the Gilbert's method.…”
mentioning
confidence: 99%
“…When HBA is reacted with 2 equiv of amine, in chloroform, the 2,2,2-tribromo-N-alkylacetamides (7,8,10,12) are obtained in yields varying from 65% to 74% for the slightly sterically hindered amines (ethylamine, n-propylamine, n-butylamine, and n-hexylamine), after 1 h of reaction, at room temperature. 19 Under the same experimental conditions, the reactions with the primary amines i-propylamine and s-butylamine, which are more sterically hindered, the 2,2,2-tribromo-N-alkylacetamides (9a, 11a) were obtained with yields between 48% and 50%.…”
mentioning
confidence: 99%
“…134,135 Destaca-se, como exemplo, a reação com trietoxifosfito, para formar o fosfato enólico pentaclorado 96, com 50% de rendimento, que reage via cicloadição [4+3] com furanos substituídos 97, em presença de uma solução de 2,2,2-trifluoretóxido de sódio em 2,2,2-trifluoretanol, para formar os oxabiciclos polissubstituídos 98, com rendimentos de 39 a 45% (Esquema 32). 136 As reações com ciclopentadienos, nas mesmas condições, formaram os respectivos biciclos com rendimentos moderados.…”
Section: Esquema 28unclassified
“…Hexachloroacetone (HCA) as a compound with interesting reactivity has useful applications in organic synthesis. This compound is used in the Perkow reaction as a haloketone . HCA is also a mild, safer and commercially available alternative to toxic phosgene for reaction with diamines to prepare open‐chain diamides, cyclic ureas, and bisimidazole via elimination of the chloroform molecule .…”
Section: Introductionmentioning
confidence: 99%