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Issue 6, 2017
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Mass spectrometric directed system for the continuous-flow synthesis and purification of diphenhydramine

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Abstract

A highly integrated approach to the development of a process for the continuous synthesis and purification of diphenhydramine is reported. Mass spectrometry (MS) is utilized throughout the system for on-line reaction monitoring, off-line yield quantitation, and as a reaction screening module that exploits reaction acceleration in charged microdroplets for high throughput route screening. This effort has enabled the discovery and optimization of multiple routes to diphenhydramine in glass microreactors using MS as a process analytical tool (PAT). The ability to rapidly screen conditions in charged microdroplets was used to guide optimization of the process in a microfluidic reactor. A quantitative MS method was developed and used to measure the reaction kinetics. Integration of the continuous-flow reactor/on-line MS methodology with a miniaturized crystallization platform for continuous reaction monitoring and controlled crystallization of diphenhydramine was also achieved. Our findings suggest a robust approach for the continuous manufacture of pharmaceutical drug products, exemplified in the particular case of diphenhydramine, and optimized for efficiency and crystal size, and guided by real-time analytics to produce the agent in a form that is readily adapted to continuous synthesis.

Graphical abstract: Mass spectrometric directed system for the continuous-flow synthesis and purification of diphenhydramine

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Publication details

The article was received on 27 Feb 2017, accepted on 10 Apr 2017 and first published on 19 Apr 2017


Article type: Edge Article
DOI: 10.1039/C7SC00905D
Citation: Chem. Sci., 2017,8, 4363-4370
  • Open access: Creative Commons BY-NC license
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    Mass spectrometric directed system for the continuous-flow synthesis and purification of diphenhydramine

    B. P. Loren, M. Wleklinski, A. Koswara, K. Yammine, Y. Hu, Z. K. Nagy, D. H. Thompson and R. G. Cooks, Chem. Sci., 2017, 8, 4363
    DOI: 10.1039/C7SC00905D

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