852237-41-3Relevant academic research and scientific papers
The continuous flow Barbier reaction: An improved environmental alternative to the Grignard reaction?
Kopach, Michael E.,Roberts, Dilwyn J.,Johnson, Martin D.,McClary Groh, Jennifer,Adler, Jonathan J.,Schafer, John P.,Kobierski, Michael E.,Trankle, William G.
experimental part, p. 1524 - 1536 (2012/06/04)
A key pharmaceutical intermediate (1) for production of edivoxetine·HCl was prepared in >99% ee via a continuous Barbier reaction, which improves the greenness of the process relative to a traditional Grignard batch process. The Barbier flow process was run optimally by Eli Lilly and Company in a series of continuous stirred tank reactors (CSTR) where residence times, solvent composition, stoichiometry, and operations temperature were optimized to produce 12 g h-1 crude ketone 6 with 98% ee and 88% in situ yield for 47 hours total flow time. Continuous salt formation and isolation of intermediate 1 from the ketone solution was demonstrated at 89% yield, >99% purity, and 22 g h-1 production rates using MSMPRs in series for 18 hours total flow time. Key benefits to this continuous approach include greater than 30% reduced process mass intensity and magnesium usage relative to a traditional batch process. In addition, the flow process imparts significant process safety benefits for Barbier/Grignard processes including >100× less excess magnesium to quench, >100× less diisobutylaluminum hydride to initiate, and in this system, maximum long-term scale is expected to be 50 L which replaces 4000-6000 L batch reactors.
Practical synthesis of chiral 2-morpholine: (4-Benzylmorpholin-2-(s)-yl)- (tetrahydropyran-4-yl) Methanone mesylate, a useful pharmaceutical intermediate
Kopach, Michael E.,Singh, Utpal K.,Kobierski, Michael E.,Trankle, William G.,Murray, Michael M.,Pietz, Mark A.,Forst, Mindy B.,Stephenson, Gregory A.,Mancuso, Vincent,Giard, Thierry,Vanmarsenille, Michel,De France, Thierry
experimental part, p. 209 - 224 (2010/04/22)
A commercial synthesis was developed for the production of (4-benzylmorpholin-2-(S)-yl)-(tetrahydropyran-4-yl) methanone mesylate, la, a key starting material for a phase 2, new investigational drug candidate at Eli Lilly and Company. The target compound was produced in the clinical pilot plant by the combination of two key steps: resolution of a morpholine amide intermediate to install the S-morpholino stereocenter in 35% yield and a high-yielding (89%) Grignard reaction to generate the title compound la, isolated as a mesylate salt. The Grignard reaction was found to proceed optimally when using a combination of I2 and DIBAL-H for the initiation. In addition, the Grignard reagent formation was monitored by ReactMax calorimetry, and proof-of-concept studies were completed, demonstrating that the Grignard step could potentially be run as a continuous process with magnesium recycling.
MORPHOLINE DERIVATIVES AS NOREPINEPHRINE REUPTAKE INHIBITORS
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Page/Page column 57, (2010/02/11)
Compounds of the general formula (I) are inhibitors of the reuptake of norepinephrine. As such, they may be useful for the treatment of disorders of the central and/or peripheral nervous system.
