微波辅助钯介导的吡唑并有效合成[3,4 b ]吡啶,吡唑并[3,4- b ]喹啉,吡唑并[1,5-一个]嘧啶和吡唑并[1,5-一个]喹唑啉†
摘要:
开发了一种高效的方法,用于在微波辐射下通过钯催化的β-卤化基/芳基醛与3-氨基吡唑/ 5-氨基吡唑的钯催化无溶剂反应合成吡唑稠合杂环。该方法适用于有效合成各种取代的吡唑并[3,4- b ]吡啶,吡唑并[3,4- b ]喹啉,吡唑并[1,5- a ]嘧啶和吡唑并[1,5-]。一]喹唑啉。合成的吡唑融合化合物中的四种显示出的体外细胞毒活性几乎与药物阿霉素对宫颈HeLa癌细胞系和前列腺DU 205癌细胞系相当。
Catalyst-Switchable Regiocontrol in the Direct Arylation of Remote CH Groups in Pyrazolo[1,5-<i>a</i>]pyrimidines
作者:Robin B. Bedford、Steven J. Durrant、Michelle Montgomery
DOI:10.1002/anie.201502150
日期:2015.7.20
The regiodivergent palladium‐catalyzed CH arylation of pyrazolo[1,5‐a]pyrimidine has been achieved, wherein the switch in regioselectivity between positionsC3 and C7 is under complete catalyst control. A phosphine‐containing palladium catalyst promotes the direct arylation at the most acidic position (C7), whereas a phosphine‐free catalyst targets the most electron‐rich position (C3).
Microwave-assisted palladium mediated efficient synthesis of pyrazolo[3,4-b]pyridines, pyrazolo[3,4-b]quinolines, pyrazolo[1,5-a]pyrimidines and pyrazolo[1,5-a]quinazolines
作者:Kommuri Shekarrao、Partha Pratim Kaishap、Venkateshwarlu Saddanapu、Anthony Addlagatta、Sanjib Gogoi、Romesh C. Boruah
DOI:10.1039/c4ra02865a
日期:——
for the synthesis of pyrazole fused heterocycles via the palladium-catalyzed solvent free reaction of β-halovinyl/aryl aldehydes and 3-aminopyrazoles/5-aminopyrazoles under microwaveirradiation in good yields. This method is applicable for the efficient synthesis of a wide range of substituted pyrazolo[3,4-b]pyridines, pyrazolo[3,4-b]quinolines, pyrazolo[1,5-a]pyrimidines and pyrazolo[1,5-a]quinazolines
开发了一种高效的方法,用于在微波辐射下通过钯催化的β-卤化基/芳基醛与3-氨基吡唑/ 5-氨基吡唑的钯催化无溶剂反应合成吡唑稠合杂环。该方法适用于有效合成各种取代的吡唑并[3,4- b ]吡啶,吡唑并[3,4- b ]喹啉,吡唑并[1,5- a ]嘧啶和吡唑并[1,5-]。一]喹唑啉。合成的吡唑融合化合物中的四种显示出的体外细胞毒活性几乎与药物阿霉素对宫颈HeLa癌细胞系和前列腺DU 205癌细胞系相当。