CATECHOL COMPOUND, PROCESS OF ITS PREPARATION, PHARMACEUTICAL COMPOSITION CONTAINING THEREOF AND THE USE OF THE COMPOUND

摘要

Catechol derivs. of formula (I), their salts and esters are new. R1 = an electronegative substit. e.g. NO2 or CN. R2 = a gp. of (II)-(IV). X1, X2, Y, Z = independently O, S or NR. R = H, alkyl, cycloalkyl, aralkyl or aryl. 9 cpds. are specifically claimed e.g. 4-(3,4-dihydroxy-5-nitrophenyl) methylidene)-2-thioxo-imidazoidin-5-one and 5-(3,4-dihydroxy-5-cyanophenyl) methylidene)-2-thioxo- thiazolidin-5-one.