Benzotriazole-Mediated Conversions of Aromatic and Heteroaromatic Aldehydes to Functionalized Ketones
摘要:
Aromatic and heteroaromatic aldehydes reacted with benzotriazole and triethyl orthoformate in THF to give the corresponding alpha-(benzotriazol-1-yl)aryl ethyl ethers 7 in good yield. The novel acyl anion precursors 7 underwent smooth lithiation at the methine group followed by trapping with alkyl halides, aldehydes, ketones, and imines to yield the expected substituted intermediates of type 9, which were hydrolyzed under mild conditions without isolation. Benzaldehyde, methyl-, chloro-, and methoxy-substituted benzaldehydes, 1-naphthalenecarboxaldehyde, 2- and 3-furaldehydes, 2- and 3-thiophenecarboxaldehydes, and 2-pyridinecarboxaldehyde were all transformed in this manner into a variety of aryl and heteroaryl ketones with alkyl (10), alpha-hydroxyalkyl (12 and 13), alpha-aminoalkyl (14) and acyl(15) substituents.
Direct and Efficient One-Pot Preparation of Ketones from Aldehydes Using <i>N</i>-<i>tert</i>-Butylphenylsulfinimidoyl Chloride
作者:James J. Crawford、Kenneth W. Henderson、William J. Kerr
DOI:10.1021/ol061903l
日期:2006.10.1
A general, one-pot process has been established to prepare ketonesfrom aldehydes using N-tert-butylphenylsulfinimidoyl chloride. By employing the developed protocol, a range of unsymmetrical ketones has been prepared in good yields from aldehydes in one simple synthetic operation. [reaction: see text]
A simple synthesis of ketone from carboxylic acid using tosyl chloride as an activator
作者:Debasis Sahoo、Sohini Sarkar、Samaresh Jana
DOI:10.1016/j.tetlet.2019.151084
日期:2019.9
An effective process for the conversion of carboxylic acid to ketone has been discovered. In this process, carboxylic acid has been activatedusing p-toluene sulphonyl group. Under the optimized condition, aromatic, aliphatic heteroaromatic carboxylic acids have been proved to be good substrates for this methodology. The byproduct of this reaction can be removed very easily during work up process.
Reaction of aldehyde O-alkyl oxime with organometallic compounds
作者:Shinichi Itsuno、Koji Miyazaki、Koichi Ito
DOI:10.1016/s0040-4039(00)84709-7
日期:1986.1
Aldehyde O-alkyl oximes were converted into ketones with high yields when they were treated with alkyllithium compounds or Grignard reagents followed by hydrolysis. Amines as reductive alkylation products of aldehyde O-alkyl oximes were also obtained by BH3 reduction before hydrolysis.
The iron(III)-catalyzed cross-coupling reaction between Grignard reagents and acylchlorides was found to be widely applicable to the synthesis of various functionalized ketones in good yields under mild conditions; the series of examples includes the synthesis of chiral methyl ketones and symmetric diketones.
Oxidative nucleophilic addition of organovanadium reagents to aldehydes with formation of ketones
作者:Toshikazu Hirao、Daisuke Misu、Toshio Agawa
DOI:10.1021/ja00310a073
日期:1985.11
En presence de reactifs de Grignard ou de butyl-lithium les benzaldehydes, furfural, alcanals, enaldehydes reagissent avec VCl 3 , conduisant a des cetones
En存在 de reactifs de Grignard ou de 丁基锂 les benzaldehydes, furfural, alcanals, enaldehydes reagissent avec VCl 3 , conduisant a des cetones