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Synthesis 1994; 1994(3): 279-281
DOI: 10.1055/s-1994-25459
short paper
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Synthesis of [1]Benzopyrano[4,3-b]pyrrol-4(1H)-ones from 4-Chlorocoumarin

Ángel Alberola* , Rocío Álvaro, José M. Andrés, Blanca Calvo, Alfonso González
  • *Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, 47005 Valladolid, Spain
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Publication Date:
27 September 2002 (online)

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4-N-(Acylmethyl)aminocoumarins or their ketal derivatives were prepared from 4-chlorocoumarin and α-amino ketones (chlorohydrates or ketal derivatives) in ethanol/triethylamine media. Their subsequent treatment in acidic or basic media readily led to [1] benzopyrano[4,3-b] pyrrol-4(1H)-ones.