Abstract
An improved and practical route is reported here for accessing 3,5-dichloro-4-(1,1,2,2-tetrafluoroethoxy)aniline (1), a key intermediate of hexaflumuron. The overall yield for the preparation of 1 is 74.0%, with a purity of 99.7%, after a one-pot process with catalytic hydrogenation and Bamberger rearrangement and a greener addition reaction in a continuous flow reactor. Compared with the original process route, the new synthetic route has the advantages of fewer reaction steps, higher overall yield, less process safety hazard and environmental impact.
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Funding
This work was supported by the National Natural Science Foundation of China (no. 21878047), the Fundamental Research Funds for the Central Universities (2242020K1G001), and a Project Funded by the Priority Academic Program Development of Jiangsu Education Institutions (PAPD) (1107047002).
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Yin, K., Wu, H., Yin, Q. et al. Efficient and Practical Route for 3,5-Dichloro-4-(1,1,2,2-tetrafluoroethoxy)aniline: a Key Intermediate of Hexaflumuron. Russ J Org Chem 59 (Suppl 1), S1–S6 (2023). https://doi.org/10.1134/S1070428023130018
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DOI: https://doi.org/10.1134/S1070428023130018