Synlett

Studies in Sulfur Heterocycles. Part 16: Synthesis of [1] Benzothieno [3, 2-b] pyrans via Tandem Reactions from 2, 3-Dihydrobenzo [b] thiophene-3 (2H) ones

S Kamila, C Mukherjee, A De

Index: Kamila, Sukanta; Mukherjee, Chandrani; De, Asish Synlett, 2003 , # 10 p. 1479 - 1481

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Citation Number: 3

Abstract

Abstract Sequential treatment of N, N-diethyl-2-methylsulfanyl aryl amides with LDA and p- anisaldehyde, 1-naphthaldehyde and cinnamaldehyde afforded the corresponding thioaurones. Heating the thioaurones derived from cinnamaldehyde, above 200 C resulted in electrocyclic ring closure and sigmatropic shift in tandem to give substituted [1] benzothieno [3, 2-b] pyran. Treatment of N, N-diethyl-2-methylsulfanyl-5-methoxy ...