Abstract
The reaction of 6,7-dihydro-1-benzothiophen-4(5H)-one and aromatic aldehyde yielded 5-arylmethylene-6,7-dihydro-1-benzothiophen-4(5H)-ones in the presence of 40% aqueous NaOH at 0 °C. The 1,3-dipolar cycloaddition of azomethine ylide generated in situ from isatin and sarcosine to 5-arylmethylene-6,7-dihydro-1-benzothiophen-4(5H)-ones gave novel 1′-methyl-4′-aryl-6,7-dihydro-4H-dispiro[1-benzothiophene-5,3′-pyrrolidine-2′,3″-indole]-2″,4(1″H)-diones in moderate yields.
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