4.8 Article

C-H functionalisation tolerant to polar groups could transform fragment-based drug discovery (FBDD)

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CHEMICAL SCIENCE
卷 12, 期 36, 页码 11976-+

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ROYAL SOC CHEMISTRY
DOI: 10.1039/d1sc03563k

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This study analyzed 131 fragment-to-lead examples targeting various protein families between 2015-2019, identifying the most common polar functional groups involved in fragment-protein binding and highlighting the key role of growth from carbocentric vectors. The results suggest that robust C-H functionalisation methods that tolerate the polar functionality on fragments could be transformative for fragment-based drug discovery.
We have analysed 131 fragment-to-lead (F2L) examples targeting a wide variety of protein families published by academic and industrial laboratories between 2015-2019. Our assessment of X-ray structural data identifies the most common polar functional groups involved in fragment-protein binding are: N-H (hydrogen bond donors on aromatic and aliphatic N-H, amides and anilines; totalling 35%), aromatic nitrogen atoms (hydrogen bond acceptors; totalling 23%), and carbonyl oxygen group atoms (hydrogen bond acceptors on amides, ureas and ketones; totalling 22%). Furthermore, the elaboration of each fragment into its corresponding lead is analysed to identify the nominal synthetic growth vectors. In similar to 80% of cases, growth originates from an aromatic or aliphatic carbon on the fragment and more than 50% of the total bonds formed are carbon-carbon bonds. This analysis reveals that growth from carbocentric vectors is key and therefore robust C-H functionalisation methods that tolerate the innate polar functionality on fragments could transform fragment-based drug discovery (FBDD). As a further resource to the community, we have provided the full data of our analysis as well as an online overlay page of the X-ray structures of the fragment hit and leads: https://astx.com/interactive/F2L-2021/

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