Synthesis 2022; 54(05): 1365-1374
DOI: 10.1055/a-1664-2282
paper

Rapid Multigram-Scale End-to-End Continuous-Flow Synthesis of Sulfonylurea Antidiabetes Drugs: Gliclazide, Chlorpropamide, and Tolbutamide

Cloudius R. Sagandira
,
Paul Watts
We thank the National Research Fund (NRF SARChI Grant) and Technology Innovation Agency (TIA) for financial support.


Abstract

A multigram-scale robust, efficient, and safe end-to-end continuous-flow process for the diabetes sulfonylurea drugs gliclazide, chlorpropamide, and tolbutamide is reported. The drugs were prepared by the treatment of an amine with a haloformate affording carbamate, which was subsequently treated with a sulfonamide to afford sulfonylurea. Gliclazide was obtained in 87% yield within 2.5 minutes total residence time with 26 g/h throughput; 0.2 kg of the drug was produced in 8 hours of running the system continuously. Chlorpropamide and tolbutamide were both obtained in 94% yield within 1 minute residence time with 184–188 g/h throughput; 1.4–1.5 kg of the drugs was produced in 8 hours of running the system continuously. N-Substituted carbamates were used as safe alternatives to the hazardous isocyanates in constructing the sulfonyl urea moiety.

Supporting Information



Publication History

Received: 16 September 2021

Accepted after revision: 07 October 2021

Accepted Manuscript online:
07 October 2021

Article published online:
22 November 2021

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