Scalable Flow Electrochemical Alcohol Oxidation: Maintaining High Stereochemical Fidelity in the Synthesis of Levetiracetam.
Scalable Flow Electrochemical Alcohol Oxidation: Maintaining High Stereochemical Fidelity in the Synthesis of Levetiracetam.
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DOI:
10.1021/acs.oprd.1c00036
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发表时间:
2021-12-17
影响因子:
3.4
通讯作者:
Stahl SS
中科院分区:
文献类型:
--
作者:
Zhong X;Hoque MA;Graaf MD;Harper KC;Wang F;Genders JD;Stahl SS
An electrochemical flow process has been developed for an alcohol oxidation step in the synthesis of the generic epilepsy drug levetiracetam. A crucial metric in this process is the retention of high enantiomeric purity as the oxidation of the primary alcohol to the carboxylic acid proceeds via an epimerizable aldehyde intermediate. Here, three different reactor configurations are compared: undivided batch, undivided flow, and divided flow cells. The divided flow cell accesses the highest rate, throughput, and enantiomeric fidelity among the three configurations. This approach is showcased in a 200-gram scale process that retains ≥97% enantiomeric purity and highlights a unique advantage of flow electrolysis.
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