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We report the design, synthetic route, and cytotoxicity of a library of 49 newly synthesized tricyclic oxazolo[5,4‐d]pyrimidines. The condensed pyrimidinones were constructed from ethyl 5‐aminooxazole‐4‐carboxylate building blocks. A tricyclic ring system was built using the naturally occurring mackinazolinone alkaloid with a focus on the molecular diversity at position C‐2 of the oxazole ring. Synthesized...
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