Reaction of isatin with acetophenone derivatives gave 3‐hydroxy‐3‐phenacyl oxindole derivatives (II), dehydration of (II) gave 3‐phenacylidene‐2‐indolinone derivatives (III). Condensation of (III) with hydrazine hydrate, phenylhydrazine and phenylthiourea afforded new spiropyrazolines (IV & V) and spiropyrimidinethione (VI) respectively. The structures of the final products were established by physical and spectral means.
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Ibrahim et al. (2009) studied this question.