期刊
ORGANIC PROCESS RESEARCH & DEVELOPMENT
卷 26, 期 11, 页码 3161-3165出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.oprd.2c00272
关键词
cyanation; palladium catalysis; etrumadenant; AB928
Palladium-catalyzed cyanation is an important method for installing functional groups commonly found in active pharmaceutical ingredients. In this study, a robust cyanation reaction was developed with full conversion achieved at a catalyst loading as low as 0.13 mol%, which was affected by trace water levels. The scale-up of this process to a hundred-kilogram batch size is also described.
Palladium-catalyzed cyanation of aryl bromides is a powerful approach to install a functional group commonly found in active pharmaceutical ingredients starting from readily available precursors. The development of a robust cyanation of a bromo benzoic acid to generate an intermediate en route to etrumadenant is described. Full conversion with catalyst loading as low as 0.13 mol % was enabled by study of the catalyst preactivation step, which was affected by trace water levels. Details of the scale-up of this process to the hundred-kilogram batch size are included.
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