Current Organic Chemistry - Volume 28, Issue 19, 2024

Quinoline is a general group of heterocyclic compounds that have garnered much interest in medicinal chemistry and drug development due to their wide range of pharmacological effects. Pyridine ring fused with benzene defines the class of chemical compounds known as quinolines. Quinoline is a weak tertiary base, also known as 1-aza-naphthalene. Numerous patents have been filed for the synthesis of quinoline-based compounds, discussing about their derivatives and uses. Here, we have discussed the methods of quinoline synthesis, structural alterations, and patents showing its importance in various industries. Quinolines have been investigated as antimalarial substances, with substances, like quinine and chloroquine, serving as notable examples, and they have also been investigated to possess anti-inflammatory, anti-tumor, and CNS activity. The synthesis of quinoline is also subjected to several recognized procedures. The variations in the ring system and various synthetic approaches are the key highlights of the article, and it includes the various catalysts that could be recycled and reused by the assisted technique, which increases the yield and requires less time for the synthesis (ultrasound-promoted synthesis, one-pot reaction, and microwave and photocatalytic reactions). The development of synthetic procedures can help in the sustainable synthesis of quinoline derivatives.

The direct chlorine-free incorporation of P1 units into organic molecules has very important synthetical value owing to environmental considerations and the prospect of accessing unique compounds with fascinating structures and useful properties. This selective survey presents a panorama of phosphorus species that are synthetic equivalents of free singlet phosphinidenes [R-P] and highlights the state-of-art of the [RP]-transfer reactions with emphasis on the synthesis of molecular architectures difficult to reach using traditional methods. Among stabilized phosphinidene precursors capable of RP-transfer are terminal transition-metal phosphinidene and phosphinidenoid complexes, dibenzo-7λ³- phosphinobornadienes, phosphinidene-phosphoranes, inversely polarized phosphaalkenes, phosphaketenes, intramolecularly base-stabilized phosphinidenes, (cyclo)polyphosphines and diphosphenes.

The most intriguing area of scientific study and engineering applications is to synthetize materials that can autonomously heal damage similar to biological tissues. Since the concept of self-healing materials was established, several variations of self-healing polymer materials have been developed based on distinct healing techniques. This review outlines the most recent breakthroughs in self-healing polymers and utilizes the opportunity to categories the descriptions of self-healing technologies in the literatures according to extrinsic and intrinsic routes (noncovalent bonds, physical interaction, and covalent bonds). The major focus is on the routes and strategies used to generate self-healing polymer materials. In addition, the strengths and weaknesses of polymer materials with different self-healing routes and strategies in terms of mechanical and self-healing properties were summarized. Furthermore, we also reviewed the progress of the development from a single self-healing mechanism to multiple self-healing mechanisms to achieve balanced comprehensive performance. Finally, the future trajectory of self-healing polymers is envisioned.

The synthesis of meso-tetraphenylporphyrin derivatives, double functionalized in one of the phenyl rings (with a nitro group and carbon substituents), is described. 5-(4- Nitroaryl)-10,15,20-triarylporphyrinates react, in the presence of a base (t-BuOK), with carbanions containing a leaving group at the carbanionic center to give products of substitution of hydrogen at ortho-position to the nitro group via vicarious nucleophilic substitution scheme. Their alkylation with allyl bromide or 4-bromobut-1-en (t-BuOK/DMF, at 0-5°C) leads to porphyrins bearing side alkyl chain with a terminal double bond in yields of up to 82%. The above-mentioned double-substituted intermediates are very convenient substrates for Heck cross-coupling reaction. In this study, the synthesis of porphyrin–azulene dyads is reported. In some cases, the formation of highly conjugated systems is observed, with moderate yield. Their structures are interesting from both the porphyrin and azulene point of view.