Letters in Organic Chemistry - Volume 19, Issue 12, 2022

Aim and Objective: A novel amino acid ionic liquid was synthesized, characterized, and approved as an efficient and recyclable catalyst for synthesizing xanthenediones and DHPMs in water at reflux temperature. Materials and Methods: The ionic liquid was synthesized by a two-step method. In the first step, pyridine- N-sulfonic acid was prepared by the reaction of pyridine with chlorosulfonic acid. In the second step, t Read More

A two-step procedure was applied to couple zerumbone, a natural sesquiterpene, with thiols 8a-k to obtain a small library of ten novel zerumbone derivatives 9a-k with full-length library data of spectra including 1H-, 13C-NMR, and HRMS. The tautomerization of 9a, 9b, and 9c was revealed in DMSO and discussed in the case of 9c. The series of 9a-k together with zerumbone 1 was evaluated for their in vitro cytotoxic activity us Read More

Aim: The study aims to optimize and synthesize benzimidazole derivatives. Background: Benzimidazoles are essential intermediates and scaffolds for biological activity and drug substances. The reported syntheses of benzimidazoles suffer from disadvantages like longer reaction time using a catalyst, which makes the method costly, and the use of strong corrosive acids and toxic reagents that increase environmental hazards. Read More

Aim: To synthesize and characterize organomercury complexes. Background: Organomercury complexes have reported for different antimicrobial activities. Objectives: Synthesis of organomercury complexes with piperidine thiohydrazide ligand and characterization, applications. Methods: Complexes were synthesized by modified reported methods. Spectral (IR, UV, 1HNMR) and TG/DTA analyses were used to characterize t Read More

Background: α-Glucosidase inhibitors have been found as the main tool for the treatment of type 2 diabetes. In this respect, the synthesis of a new series of amino-oxoethylcinnamamide derivatives containing α,β-unsaturated carbonyl-based moiety, was developed to be evaluated for their anti-α- Methods: The title compounds were synthesized via the Ugi reaction of cinnamic acid, isocyanides, aromatic aldehydes, and amine de Read More

Background: The methods of dehydration of alcohols frequently suffer from the following drawbacks: high reaction temperature, toxic catalysts, high catalyst loading, and difficulty to remove catalysts. Therefore, the development of a new catalyst for the dehydration of alcohols is still of importance. Methods: Graphite oxide is used as a catalyst for dehydration of alcohols. Results: Graphite oxide is used as a catalyst for de Read More

Background: In this study, the synthesis and characterization of a novel kind of NiO-supported CuO nanoparticles (CuO/NiO nanocatalyst), as an efficient and recyclable catalyst, were carried out. Methods: Nanocatalyst was characterized by XRD, BET, FESEM, EDS, HRTEM, TGA and DSC analysis. It was used in the three-component synthesis reaction between barbituric acid, malononitrile and various aromatic aldehydes f Read More

Aims: The development of a sensitive and visual analytical method for detecting and monitoring the change of pH has always attracted great interest because it plays a significant role in chemical reactions, environmental monitoring, and biological systems. Methods: In this paper, a simple condensation reaction from readily available substrates 2-hydroxy-1- naphthylaldehyde and malononitrile has been carried out to produ Read More

Aims: Synthesis of dihydropyrimidinones derivatives. Background: carrying out reactions in the green route and organic solvent-free conditions. Objective: Regioselective Michael addition of dihydropyrimidinones to acrylic esters. Methods: The reaction proceeded in the presence of K2CO3/TBAB, a media of inorganic base K2CO3 and organic ionic salt TBAB (tetrabutylammonium bromide) at 100°C. Results: A series o Read More

Kadsura coccinea is a folk medicine from the family Schisandraceae. Clinically, it has been used to treat many diseases like chronic gastritis and rheumatoid arthritis (RA). Lignans and triterpenes are the main constituents of it. In this paper, phytochemical research on the root of K. coccinea was carried out, leading to the isolation of a previously undescribed 3,4-secolanostane (1). Its structure was established by means of co Read More

Microbial transformation of β-caryophyllene (1) by suspended cell cultures of the plant pathogen fungus Aspergillus niger, resulted in the production of one major metabolite. This metabolite was identified as (3aR,11aS, E)-9-methyl-4-methylene-3a,4,7,10,11,11a-hexahydro-2H-furo[3,2- c]oxecine-2,6(3H)-dione (2), by different spectroscopic methods. Metabolite 2 was found to be a new compound. The proposed pathway Read More

A series of new spirothiadiazole oxindoles were synthesized by the reaction of 4-amino-5- mercapto-3-[(1H-indol-3-yl)methyl]-1,2,4-triazole and isatin derivatives. The reaction of spiro [indole] thiadiazoles with formaldehyde and piperidine afforded the corresponding Mannich bases. The structures of newly synthesized compounds were characterized by IR, 1D-NMR, 2D-NMR, and LC/MS spectral data.

Many therapeutically important nucleoside analogues can be synthesized from versatile azidonucleoside intermediates. We have synthesized 3’-xylo-azidonucleoside analogues of thymidine and 2’-deoxyadenosine via Mitsunobu-DPPA and triflate-lithium azide strategies. On comparing the two azidation strategies on nucleoside analogues, we found that Mitsunobu-DPPA azidation is better than triflate-lithium azide azidation in ter Read More

A concise and efficient synthesis of styryllactone derivative, goniothalesdiol A, has been achieved in the six longest linear steps with 17.7% overall yield. The key steps of our synthesis involved PdCl2-mediated Wacker-type oxidative cyclisation and one-pot tandem Wittig olefination- Michael addition.

A tandem system that enabled the synthesis of 2-substituted benzo[b]furans from 2- halophenols and aryl acetylenes catalyzed by Ni/5-bromo-2,2’-dipyridine was explored. The protocol was found effective for one-pot cascade coupling cyclization reaction producing benzo[b]furan compounds, and heteroaryl substrates were observed to be compatible for this system as well, giving corresponding products in 20-70% yields.