A simple and general approach for the synthesis of highly functionalized 6-oxo-1,6-dihydropyridines
作者:Sukeerthi Kumar、Rajni R. Thakur、Sanjay R. Margal、Abraham Thomas
DOI:10.1016/j.tet.2013.04.082
日期:2013.6
A variety of 5-cyano-4-methylthio-6-oxo-1,6-dihydropyridine-3-carboxylates have been efficiently synthesized in a one-pot reaction from N-alkyl and N-aryl derivatives of 2-cyano-3,3-bis(methylthio)acrylamides and selected β-keto esters. The reaction proceeds via potassium hydrogen carbonate mediated conjugate addition of a β-keto ester to 2-cyano-3,3-bis(methylthio)acrylamide followed by loss of methyl
作者:Anilkumar S. Patel、Naval P. Kapuriya、Yogesh T. Naliapara
DOI:10.1002/jhet.2860
日期:2017.9
A concise and effective approach to dicarboxamide functionalized novel pyrazolo[1,5‐a]pyrimidine has been developed. The method involves [3 + 3] hetroaromatization of oxoketene dithioacetals (16a–x) with 5‐amino‐N‐cyclohexyl‐3‐(methylthio)‐1H‐pyrazole‐4‐carboxamide (12) in the presence of K2CO3. This method has advantages of excellent yields, operational simplicity, and avoidance of hazardous base
已经开发出一种简洁有效的方法将二甲酰胺官能化的新型吡唑并[1,5- a ]嘧啶。该方法涉及在存在K 2 CO的情况下,用5-氨基-N-环己基-3-(甲硫基)-1H-吡唑-4-羧酰胺[ 12 +3]氧化氧杂环丁二硫缩醛(16a–x)的芳香化。3。该方法的优点是产率高,操作简单并且避免了诸如哌啶的有害碱。
Design, Multicomponent Synthesis and Characterization of Diversely Substituted Pyrazolo[1,5-a] Pyrimidine Derivatives
作者:Satish M. Ghelani、Yogesh T. Naliapara
DOI:10.1002/jhet.2496
日期:2016.11
The synthesis of various heterocycliccompounds using acetoacetanilide[AAA], we have demonstrated that acetoactanilide are versatile intermediate for the synthesis of pyrazolopyrimidine derivatives. Thus, to explore further, we sought that the reaction of various acetoactanilide, an appropriate aldehyde and 5‐amino‐N‐cyclohexyl‐3‐(methylthio)‐1H‐pyrazole‐4‐carboxamide in the presence of base in isopropyl