The pyrazolopyridone 70 was obtained from the reaction of 1 with 1-phenyl -3-methyl -4-formyl -5-chloropyrazole 69 (Scheme 27). It's important to mention that, cyanoacetohydrazide 1 may act as an ambident nucleophile, i.e. N -and C-nucleophile, as observed in its reaction with phenyl -7fluoro-4-chromone -3-sulphonate 71 in the presence of sodium acetate. Two new compounds were obtained from the reaction formed after the elimination of the phenolate group and subsequent dehydration leads to the production of the end isolable product 75 (Scheme 28) .