The final step is the cyclization to form the oxazole ring. This can be achieved by reacting the biaryl compound from step 2 with a suitable reagent that can introduce the oxazole ring. Acid-catalyzed cyclization with a reagent like hydroxylamine can be used to form the oxazole ring.
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2-(5-benzoyl-2-thienyl)naphtho[1,2-d]oxazole
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