A new hybrid heterocyclic compound, 2-[(4-amino-4H-1,2,4-triazol-3-yl)sulfanyl]-1-[4-(4-chlorophenyl)piperazin-1-yl]ethan-1-one (3), was synthesized by the reaction of 4-amino-4H-1,2,4-triazole-3-thione with 2-chloro-1-[4-(4-chlorophenyl)piperazin-1-yl]ethan-1-one under alkaline conditions. The target compound was obtained in a 63% yield and purified by recrystallization from butanol. Its structure was confirmed by elemental analysis, FT-IR spectroscopy, 1H and 13C NMR spectroscopy, DEPT-135, and 2D NMR (COSY, NOESY, HSQC, HMBC). The spectroscopic data were fully consistent with the proposed molecular structure. The synthesized molecule combines two pharmacologically relevant structural motifs, namely a 4-amino-1,2,4-triazole fragment and a 4-(4-chlorophenyl)piperazine moiety, connected through a sulfur-containing linker. The physicochemical characteristics and analytical data of the title compound are reported.
A novel Schiff base, 2-((1-(naphthalen-2-yl)ethylidene)amino)aniline, was successfully synthesized in the present work. The target compound was systematically characterized using 1H nuclear magnetic resonance (NMR) spectroscopy, 13C NMR spectroscopy and mass spectrometry. The consistent, comprehensive analytical data obtained from the aforementioned characterization methods fully confirm both the successful preparation of this previously unreported molecule and the integrity of its expected chemical structure.
With a view to introducing oxygen functionality at the 2-position, a range of N-methyl pyrrole derivatives functionalised with various ortho-directing groups at the 3-position have been prepared and fully characterised using spectroscopic methods.
The development of efficient cationic amphiphiles remains an important area in the design of nonviral systems for nucleic acid delivery. In this study, we report the synthesis of three lysine-containing lipid-like amphiphiles incorporating pyrrole, furan, and thiophene as five-membered heterocyclic linkers. The compounds share a common molecular scaffold comprising two heterocyclic linkers with a lysine-derived cationic moiety and two tetradecyl chains, while differing in the five-membered heterocyclic core. The target amphiphiles were synthesized using a four-step synthetic approach involving Cu(I)-catalyzed azide–alkyne cycloaddition, followed by Boc deprotection and anion exchange to afford compounds 6a–c as tetrahydrochloride salts. The final compounds were isolated in a 39–50% range over the final two steps. Their structures were confirmed by NMR spectroscopy and high-resolution mass spectrometry. Additional multinuclear two-dimensional NMR experiments were used to support the structural assignment of compound 6a. These amphiphiles provide new structures for further investigation of their physicochemical properties, self-assembly, nucleic acid complexation, and potential application in nonviral nucleic acid delivery.
This research aimed to develop a new semisynthetic piperine compound derived from black pepper (Piper nigrum, Piperaceae), commonly known as “King of Spices”. Piperine was isolated from the ethanolic extract of Piper nigrum by the Soxhlet extraction method. In this, 5(2E,4E)-5-(benzo[d][1,3]dioxol-5-yl)-1-(piperidin-1-yl)penta-2,4-dien-1-one (Piperine) is used as a starting material to form (2E,4E)-5-(benzo[d][1,3]dioxol-5-yl)penta-2,4-dienoic acid (2). After that, ethyl (2E,4E)-5-(benzo[d][1,3]dioxol-5-yl)penta-2,4-dienoate (3) will be formed by the esterification process. The (2E,4E)-5-(benzo[d][1,3]dioxol-5-yl)penta-2,4-dienehydrazide (4) was formed by using hydrazine and ethanol. In the final step, the hydrazide was reacted with p-aminobenzoic acid to form 4-(5-((1E,3E)-4-(benzo[d][1,3]dioxol-5-yl)buta-1,3-dien-1-yl)-1,3,4-oxadiazol-2-yl)aniline (5). The novel synthesized compound was characterized by IR, 1H NMR, 13C NMR, and mass spectroscopy.
