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Li, Hui; Sheeran, Jillian W; Kouvchinov, David; Clausen, Andrew M; Crouch, Ian T; Bio, Matthew M; Fang, Yuan-Qing; Frank, Scott A; Johnson, Martin D; Kerr, Mark S
Journal of organic chemistry, 02/2022, Letnik: 87, Številka: 4Journal Article
The ketone intermediate LSN647712 is a key synthetic intermediate for the drug substance lasmiditan manufacturing process. A three-step connected continuous flow process utilizing a Turbo Grignard reagent, N-methylpiperidin-4-ylmagnesium chloride, and lithiated 2,6-dibromopyridine sequentially added to double electrophile (OC(++) synthon dimethylcarbamyl chloride (DMCC) was developed to deliver the ketone intermediate in a high chemical yield (>85%). This highly productive (>100 g/h lab system) and intensified process (τ ∼ 3 min) yields the product in high purity upon batch reactive crystallization to form a corresponding hydrobromide salt. In addition to the connected plug flow reactor system, the Grignard reagent, N-methylpiperidin-4-ylmagnesium chloride, was also prepared continuously in CSTR as a more soluble LiCl adduct in THF (Turbo Grignard).
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Leto | Faktor vpliva | Izdaja | Kategorija | Razvrstitev | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Vir: Osebne bibliografije
in: SICRIS
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