Hydrazine hydrate (1:1) → 4-(2-[4-(4-Methoxyphenyl)piperazin-1-yl]pyridin-5-yl)semicarbazide

Participants

Reaction Steps

A mixture of the product of part (iii) (2.8 g, 6.9 mmole) and hydrazine hydrate (7.5 ml, 150 mmole) in 1,4-dioxane (50 ml) was heated under reflux for 1.5 hours. The cooled mixture was filtered to provide a solid which was washed with ether to yield the desired product, m.p. 280°-282° (2.0 g, 85%), which was used without further purification.

Provenance & Evidence