Synthesis and functionalisation of 1H-pyrazolo[3,4-b]pyridines involving copper and palladium-promoted coupling reactions
作者:G. Lavecchia、S. Berteina-Raboin、G. Guillaumet
DOI:10.1016/j.tetlet.2004.01.067
日期:2004.3
A convenient route to novel 3-iodo-1H-pyrazolo[3,4-b]pyridines via iododediazonation of 3-amino-1H-pyrazolo[3,4-b]pyridines, which are obtained by copper-catalysed cyclisation of 2-chloro-3-cyanopyridine with hydrazines. We describe also efficient coupling reactions from 3-iodo derivatives with various reagents according to Suzuki, Heck, Stille, and Sonogashira conditions.
通过3-氨基-1H-吡唑并[3,4- b ]吡啶的碘二重氮化反应制得新颖的3-碘-1H-吡唑并[3,4- b ]吡啶的简便方法氯-3-氰基吡啶与肼。我们还描述了根据Suzuki,Heck,Stille和Sonogashira条件从3-碘衍生物与各种试剂的有效偶联反应。