In the present investigation, an alluring green PEG‐400 mediated one‐pot synthesis of novel 2‐(2‐hydrazinyl)thiazole derivatives from 1,2,6,7‐tetrahydro‐8H‐indeno[5,4‐b]furan‐8‐one has been unveiled via a novel synthetic pathway. The application of PEG in organic reactions as a reaction media is one of the fantastic tools of green chemistry as reactions can be carried out under generous conditions limiting environmental peril and chemical waste. PEG‐400 is recognized as a low‐cost, non‐flammable, environmentally benign, recyclable, and richly available green solvent. A series of novel 2‐(2‐hydrazineyl)thiazole derivatives have been synthesized in good to excellent yield by using the green capability of PEG‐400 solvent. These newly synthesized compounds were tested for their antimicrobial and antioxidant activities. The results revealed that these compounds show good activities compared with the standard. Additionally, all the synthesized compounds exhibit negligible cytotoxicity as compared to the positive control. The structures of all novel compounds reported herein are established using FT‐IR, 1H NMR, 13C NMR, D2O exchange experiment and HRMS techniques.

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In the present work, we report an proficient, elegant, and rapid one-pot synthesis of variety of 3,4-dihydropyrimidine-2(1H)one/thione derivatives from β-dicarbonyl compounds, urea/thiourea, and various aromatic aldehydes using nano-La 2 O 3 catalyst under ultrasonic irradiation. This novel synthetic strategy benefits with excellent yields, short reaction time, benign reaction conditions, clean transformation, and purification of products by non-chromatographic strategies. In addition, the synthesized nano-material was also explored as an effective gas sensor for NO 2 , LPG, methyl alcohol, and ammonia. The gas-sensing properties such as selectivity and sensitivity of selected gases along with response and recovery for nano-La 2 O 3 sensor are reported in this paper. In this way, conferring nano-La 2 O 3 is a multifunctional catalyst not only for organic synthesis but also for gas sensing. The synthesized La 2 O 3 nano-material was characterized by Fourier transform IR, powder X-ray diffraction, field-emission scanning electron microscopy, high-resolution transmission electron microscopy, energy-dispersive spectroscopy, and Brunauer-Emmett-Teller isotherm. The formation of Biginelli adducts was confirmed by Fourier transform IR, 1 HNMR, 13 CNMR, DEPT-135 (distortionless enhancement by polarization transfer spectra), and mass spectral techniques. Graphical abstractKeywords Nano-La 2 O 3 catalyst · 3,4-Dihydropyrimidine-2(1H)-ones/thiones · Ultrasonic irradiation · Gas sensing and BET

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