Pyridine → 3-Amino-1-(4-methylbenzyl)-pyrazol-5-one

참여 물질

반응 단계

17.5 g of β-amino-β-ethoxyacrylic acid ethyl ester and 13.6 g of 4-methylbenzylhydrazine are introduced into 75 ml of pyridine. The mixture is stirred for 8 hours at room temperature and the pyridine is driven off under reduced pressure. The residue is treated with a solution of 4.6 g of Na in 100 ml of ethanol and the mixture is warmed to 60° for 1 hour. The alcohol is driven off and the residue is taken up in 100 ml of water. The aqueous phase is extracted with ether, clarified with charcoal and acidified. A yellow-colored precipitate is obtained, which melts at 149° after recrystallisation from alcohol. The yield is 7.3 g of the compound identified above, corresponding to 36% of theory.

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