Synthesis of 4-hydroxy-2(1H)-pyridones from azomethines and substituted dialkylmalonates
摘要:
The reaction of azomethines 4 with substituted dialkyl malonates 5 leads to the formation of 3-substituted 4-hydroxy-2(1H)-pyridones 6 in moderate yields. The azomethines 4 are prepared via arylaminopropionitriles 3 or in the conventional way by acid catalyzed condensation of ketones 1 with anilines 2. Chlorination of pyridones 6 with sulfuryl chloride leads to compounds 8-10.
Synthesis of 3-Acetyl-4-hydroxy-1-phenylpyridin-2(1<i>H</i>)-one Derivatives
作者:B. P. Nikam、T. Kappe
DOI:10.1002/jhet.2030
日期:2015.1
with hydroxylamine hydrochloride produces 4‐hydroxy‐3‐[N‐hydroxyethanimidoyl]‐1‐phenylpyridin‐2(1H)‐ones 6 from which 3‐alkyloxyiminoacetyl‐4‐hydroxy‐1‐phenylpyridin‐2(1H)‐ones 7 are obtained by reacting with alkyl bromides or iodides in the presence of anhydrous potassium carbonate with moderate yields. The similar compounds can be synthesized on refluxing 3‐acetyl‐4‐hydroxy‐1‐phenylpyridin‐2(1H)‐ones
用丙二酸二乙酯将芳基酮苯甲酸酯3环化,以良好的收率得到4-羟基-6-苯基-6 H-吡喃[3,2 - c ]-吡啶-2-5-二酮4。3-乙酰基-4-羟基-1-苯基吡啶-2-(1 H)-ones 5是通过4-羟基-6-苯基-6 H-吡喃[3,2- c ]吡啶形成的开环反应而获得的。2,5-二酮4在1,2-二甘醇存在下。3-乙酰基-4-羟基-1-苯基吡啶-2(1 H)-ones 5与盐酸羟胺的反应产生4-羟基-3- [ N-羟基乙亚氨基酰基] -1-苯基吡啶-2(1 H) -ones6在无水碳酸钾存在下,通过与烷基溴化物或碘化物反应,以中等收率得到3-烷氧基亚氨基乙酰基-4-羟基-1-苯基吡啶-2(1 H)一7。在碳酸氢钠存在下,用取代的羟胺盐酸盐在回流的3-乙酰基-4-羟基-1-苯基吡啶-2-2(1 H)-酮5上可以合成相似的化合物,收率很高。大多数合成的化合物通过IR和NMR光谱法表征。
Effect of pressure on the Strecker synthesis of hindered α-aminonitriles from ketones and aromatic amines
作者:Gérard Jenner、Ridha Ben Salem、Jong Chul Kim、Kiyoshi Matsumoto
DOI:10.1016/s0040-4039(02)02598-4
日期:2003.1
effect of highpressure is examined in Strecker reactions involving ketones, amines and trimethylsilyl cyanide. This effect is small when moderately hindered reactants are involved. However, in the case of aniline and N-methylaniline, the sensitivity of the reaction to pressure increases with increasing steric bulk of the alkyl groups of the ketone. The results confirm the merit of pressure activation
A concise, straightforward and efficient method has been developed for the synthesis of α-aminonitriles by an one-pot three-component condensation of aldehydes or ketones, amines and trimethylsilyl cyanide catalyzed by MgI2 etherate under solvent-free conditions. This protocol has some advantages such as mild reaction condition, simple work-up, short reaction time and high product yields.
A quick and highly efficient, one-pot, three-component, solvent-free method for the synthesis of α-aminonitriles starting from the corresponding carbonyl compounds, amines, and trimethylisocyanide using triphenylphosphine dibromide, has been developed. Diverse α-aminonitriles have been synthesized in good to excellent yields (80–99%) using a range of aldehydes, ketones and amines.
Fe(Cp)2PF6 catalyzed efficient Strecker reactions of ketones and aldehydes under solvent-free conditions
作者:Noor-ul H. Khan、Santosh Agrawal、Rukhsana I. Kureshy、Sayed H.R. Abdi、Surendra Singh、Eringathodi Suresh、Raksh V. Jasra
DOI:10.1016/j.tetlet.2007.11.136
日期:2008.1
The synthesis of alpha-aminonitriles of ketones and aldehydes was performed in very short reaction times (20 min) with excellent yields in the presence of 5 mol % of Fe(Cp)(2)PF6 under solvent-free conditions. (c) 2007 Published by Elsevier Ltd.