Copper-catalyzed tandem S-alkylation and S-alkenylation of sodium sulfide: synthesis of 2,3-Dihydrothiophene (cas 1120-59-8)s and thiophenes
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Add time:09/10/2019 Source:sciencedirect.com
An efficient synthetic approach to variously substituted 2,3-dihydrothiophenes has been developed. The reaction proceeded by copper-catalyzed tandem S-alkylation and S-alkenylation of sodium sulfide with 1,4-diiodobut-1-enes to afford the corresponding 2,3-dihydrothiophene derivatives in high yields. The 2,3-dihydrothiophenes could bear alkyl, aryl as well as heteroaryl substituents. The resulted 2,3-dihydrothiophenes could be further transferred into the corresponding thiophenes by oxidation.
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