An Alternative Indazole Synthesis for Merestinib
Organic Process Research & Development(2018)
Abstract
A new synthesis of a key indazole-containing building block for the MET kinase inhibitor merestinib was designed and demonstrated. Crucial to the successful construction of the challenging indazole is an SNAr reaction, which forges the heterocyclic ring. Continuous processing was applied to two of the five steps: nitration of a benzaldehyde and high-temperature hydrolysis of an aniline to phenol. Compared to a highly developed historical route, the new route shows clear benefits in terms of product quality and potentially manufacturability and robustness.
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Key words
alternative indazole synthesis
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