Palladium mediated regioselective intramolecular Heck reaction: synthesis of 1,3,4-trisubstituted pyrazolo[3,4-b]pyridines, 3H-pyrazolo[3,4-c]isoquinolines and 3H-pyrazolo[4,3-f][1,7]naphthyridines
作者:Rashmi Prakash、Kommuri Shekarrao、Pallabi Saikia、Sanjib Gogoi、Romesh C. Boruah
DOI:10.1039/c4ra17190j
日期:——
An efficient method was developed for the synthesis of 1,3,4-trisubstituted pyrazolo[3,4-b]pyridines, 3H-pyrazolo[3,4-c]isoquinolines and 3H-pyrazolo[4,3-f][1,7]naphthyridines via intramolecular Heck reactions of imine derivatives of β-halovinyl/aryl aldehydes and 5-aminopyrazoles. This palladium acetate catalyzed reaction afforded good yields of these pyrazolo fused compounds under thermal conditions
开发了一种有效的方法来合成1,3,4-三取代的吡唑并[3,4- b ]吡啶,3 H-吡唑并[3,4- c ]异喹啉和3 H-吡唑并[4,3- f ] β-卤代戊基/芳基醛与5-氨基吡唑的亚胺衍生物通过分子内Heck反应合成[1,7]萘啶。该乙酸钯催化的反应在黄原磷作为配体的存在下在热条件下提供了这些吡唑并稠合的化合物的良好产率。