Trifluoroacetic acid → 11-Oxo-2,3,10,11-tetrahydro-1H-benzo[b]indeno[5,6-f] thiepin-7-carboxylic acid

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Reaction Steps

4-Carboxy-2-(5-indanylthio)phenylacetic acid (33.55 g, 0.102 mole) was added to trifluoroacetic acid (200 ml) and to the stirred suspension was added, slowly with stirring, trifluoroacetic anhydride (200 ml). After stirring the mixture for 48 hours at room temperature, the mixture was poured slowly onto ice (200 g), and the slurry was diluted to about 1 liter before collecting the crude product. The dried solid was stirred in suspension in acetonitrile for 45 minutes, refiltered and dried to yield 24.95 g.

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