Scale-up and Optimization of a Continuous Flow Synthesis of an α-Thio-β-chloroacrylamide

• Olga C. Dennehy¹
• Denis Lynch¹
• Stuart G. Collins^1*
• Anita R. Maguire^2*
• Humphrey A. Moynihan^1*

• ¹School of Chemistry, Analytical and Biological Chemistry Research Facility, Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork T12 K8AF, Ireland.
• ²School of Chemistry and School of Pharmacy, Analytical and Biological Chemistry Research Facility, Synthesis and Solid State Pharmaceutical Centre, University College Cork, Cork T12 K8AF, Ireland

Use of continuous flow processing to undertake a multistep chlorination cascade has been achieved with effective inline work-up and end-of-line crystallization in batch leading to isolation of α-thio-β-chloroacrylamide Z-3 in pure form from a complex reaction mixture, exploiting the advantage of efficient heat transfer in flow. During the development of a continuous flow strategy for the production of appreciable quantities of the α-thio-β-chloroacrylamides, difficulties surrounding a labour and resource intensive work-up followed by final product isolation were addressed. A greener solvent choice was applied to the chemical synthesis which enabled inline purification and separation, resulting in the crystallization of pure product directly from the reaction mixture. This process was readily scalable and demonstrated control over impurity formation and removal, which is key in an industrial setting.

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