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Zhai L.-H.,Nanjing Southeast University | Zhai L.-H.,Lunan Pharmaceutical Co. | Guo L.-H.,Lunan Pharmaceutical Co. | Sun B.-W.,Nanjing Southeast University
RSC Advances | Year: 2015

A direct method for the synthesis of formyl-substituted imidazo[1,2-a]pyridines was achieved easily from cyclization of aminopyridines and cinnamaldehydes via copper catalysis. This oxidative cyclization process involved direct C-H bond functionalization, and C-C/C-N bond formation. In this transformation, the sensitive aldehyde group was preserved under oxidative conditions. © 2015 The Royal Society of Chemistry. Source


Zhai L.-H.,Nanjing Southeast University | Zhai L.-H.,Lunan Pharmaceutical Co. | Guo L.-H.,Lunan Pharmaceutical Co. | Luo Y.-H.,Nanjing Southeast University | And 2 more authors.
Organic Process Research and Development | Year: 2015

The discovery and development of an efficient synthesis route to axinitib is reported. The first-generation route researched by Pfizer implemented two Pd-catalyzed coupling reactions as key steps. In this work, the development of Heck-type and C-S coupling reactions catalyzed by CuI is briefly described, using an economial and practical protocol. Aspects of this route, such as selecting optimal ligands, solvent, and other conditions, are discussed in detail. The scale-up experiment was carried out to provide more than 300 g of active pharmaceutical ingredients of axitinib in Form XLI with 99.9% purity in 39% yield. In short, we provide a new choice of synthesis route to axitinib, through two copper-catalyzed coupling reactions with good yield. © 2015 American Chemical Society. Source

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