Solid‐Supported Synthesis of Isoxazole‐Substituted 1,4‐Dihydropyridines by Modified Hantzsch Method and Their Aromatization
作者:E. Rajanarendar、P. Ramesh、M. Srinivas、K. Ramu、G. Mohan
DOI:10.1080/15459620500408884
日期:2006.3.1
Abstract The synthesis of isoxazole‐substituted Hantzsch 1,4‐dihydropyridines has been achieved by modified Hantzsch procedure for the first time by utilizing ketoamides in place of keto esters on a neutral alumina support in excellent yields. These 1,4‐dihydropyridines are aromatized to the corresponding pyridines in high yields by using bismuth subnitrate (BiONO3) adsorbed on acidic alumina at ambient
摘要 异恶唑取代的 Hantzsch 1,4-二氢吡啶的合成首次通过改进的 Hantzsch 程序通过在中性氧化铝载体上使用酮酰胺代替酮酯以优异的产率合成。通过使用吸附在酸性氧化铝上的碱式硝酸铋 (BiONO3) 在环境温度下将这些 1,4-二氢吡啶以高产率芳构化为相应的吡啶。