Pharmacologically active catechol derivatives

  • US 5,446,194 A
  • Filed: 09/16/1993
  • Issued: 08/29/1995
  • Est. Priority Date: 11/28/1986
  • Status: Expired due to Term
First Claim
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1. A compound according to formula I ##STR53## wherein R1 and R2 independently represent hydrogen, carbamoyl which is substituted by an alkyl of 1 to 4 carbon atoms, alkylcarbonyl of 2 to 5 carbon atoms or phenyl carbonyl, X represents nitro or cyano and R3 represents ##STR54## wherein R4 represents cyano or alkylcarbonyl of 2 to 5 carbon atoms and R5 represents carbamoyl which is unsubstituted or substituted with alkyl of 1 to 8 carbon atoms or which is substituted with hydroxyalkyl of 1 to 8 carbon atoms or pharmaceutically acceptable esters and salts thereof.

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