Abstract
A simple and efficient method has been developed for the synthesis of benzo[ B]thiophenes and naphtho[2,1- B]thiophenes from arenethiols and α-halo ketones using Na 2 CO 3 /SiO 2 -PPA/SiO 2 . Reaction of α-halo ketones with arenethiols is promoted by Na 2 CO 3 /SiO 2 to afford α-sulfanyl ketones, which cyclize in the presence of PPA/SiO 2 to give the corresponding thiophene-fused arenes in one-pot. The reaction using α-bromo acetals instead of α-halo ketones also gave the corresponding naphtho[2,1- B]thiophenes via a three-step reaction in one-pot.
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