(2E)-N'-[(E)-4-Chloro-benzyl-idene]-3-phenyl-prop-2-enohydrazide monohydrate

Antiprotozoal activity of (E)-cinnamic N-acylhydrazone derivatives

A series of 14 (E)-cinnamic N-acylhydrazone derivatives, designed through molecular hybridization between the (E)-1-(benzo[d][1,3]dioxol-5-yl)-3-(4-bromophenyl)prop-2-en-1-one and (E)-3-hydroxy-N'-((2-hydroxynaphthalen-1-yl)methylene)-7-methoxy-2-naphthohydrazide, were tested for in vitro antiparasitic activity upon axenic amastigote forms of Leishmania donovani and bloodstream forms of Trypamosoma brucei rhodesiense. The derivative (2E)-3-(4-hydroxy-3-methoxy-5-nitrophenyl)-N'-[(1E)-phenylmethylene]acrylohydrazide showed moderate antileishmanial activity (IC₅₀ = 6.27 µM) when compared to miltefosine, the reference drug (IC₅₀ = 0.348 µM). However, the elected compound showed an excellent selectivity index; in one case it was not cytotoxic against mammalian L-6 cells. The most active antitrypanosomal compound, the derivative (E)-N'-(3,4-dihydroxybenzylidene)cinnamohydrazide (IC₅₀ = 1.93 µM), was cytotoxic against mammalian L-6 cells.

(2E)-N'-[(E)-Benzyl-idene]-3-phenyl-prop-2-enohydrazide from synchrotron radiation

In the title compound, C(16)H(14)N(2)O, the dihedral angle between the phenyl rings is 25.48 (12)°. An E conformation is found for each of the imine [1.269 (3) Å] and ethyl-ene [1.313 (3) Å] bonds. In the crystal, mol-ecules are linked by N-H⋯O hydrogen bonds, leading to zigzag chains along [010]. Supra-molecular layers in the ab plane are formed, whereby the chains are linked by C-H⋯N and C-H⋯π inter-actions.

N'-(2,4-Dichloro-benzyl-idene)-4-hy-droxy-benzohydrazide

The title hydrazone compound, C₁₄H₁₀Cl₂N₂O₂, was synthesized by the reaction of 2,4-dichloro­benzaldehyde and 4-hy­droxy­benzohydrazide. The mol­ecule adopts an E geometry with respect to the azomethine group and the dihedral angle between the aromatic rings is 7.0 (2)°. In the crystal, mol­ecules are linked through inter­molecular N—H⋯Cl and O—H⋯O hydrogen bonds, forming a three-dimensional network.