Naslov
Effective methods for the synthesis of hydrazones, quinazolines, and Schiff bases: reaction monitoring using a chemometric approach
(Effective methods for the synthesis of hydrazones, quinazolines, and Schiff bases: reaction monitoring using a chemometric approach)

Autori
Pisk, Jana ; Đilović, Ivica ; Hrenar, Tomica ; Cvijanović, Danijela ; Pavlović, Gordana ; Vrdoljak, Višnja

Izvornik
RSC Advances (2046-2069) 10 (2020); 38566-38577

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
hydrazones ; quinazolines ; Schiff bases

Sažetak
Synthesis of hydrazones (1a–4a and 1b–4b), quinazolines (3c*MeOH and 3d*MeOH), and hydrazone- Schiff bases (4c and 4d) is achieved by combining suitable aldehydes (2, 3- or 2, 4- ihydroxybenzaldehyde) with four hydrazides (isonicotinic, nicotinic, and 2- or 4-aminobenzoic acid hydrazide). A suite of approaches for their preparation is described: solution-based synthesis, mechanosynthesis, and solid-state melt reactions. The mechanochemical approach is generally a better choice for the quinazolines, while the solid-state melt reaction is more efficient for derivatives of (iso)nicotinic based hydrazones. Crystalline amine-functionalised hydrazones 4a and 4b undergo post-synthetic modifications in reactions with 3- or 4- pyridinecarbaldehyde vapours to form hydrazone- Schiff bases 4a-3py, 4b-3py, 4a-4py, and 4b4py. Mechanochemical and vapour-mediated reactions are followed by ex situ powder X-ray diffraction and IR-ATR methods, respectively. The chemometric analysis of these data using principal component analysis provided an insight into the reaction profiles and reaction times. Azines (5a and 5b), achieved from aldehydes and hydrazine, reversibly change colour in response to temperature changes. The structures of all products are ascertained by a combined use of spectroscopic and X-ray diffraction methods. The cytotoxic and antimicrobial activities of all compounds against selected human cancer cell lines and bacterial strains are evaluated.

Izvorni jezik
Engleski

Znanstvena područja
Kemija

POVEZANOST RADA