Abstract

AbstractWe propose a synthetic process for the preparation of a benzoxazole building block for a programmed death-ligand 1 inhibitor that is a candidate currently under clinical investigation for cancer treatment. Our research focused on searching for mild, scalable, and ecofriendly conditions for the synthesis of benzoxazoles. To reduce the use of toxic reagents or solvents and to minimize the production of organic wastes, the cyclization reaction was performed in an aqueous micellar medium. This in-water benzoxazole synthesis gave comparable yields to previously reported processes, and was applied to a broad range of benzoxazoles with various substitution patterns, showcasing its effectiveness in ecofriendly benzoxazole cyclization reactions.

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