SnCl2-mediated heterocyclization approach for the synthesis of benzisoxazole/quinoline-embedded β-carboline scaffolds

A Sn(II)-mediated facile entry towards construction of C-C/C-O and C-C/C-N bonds was devised. The developed reductive heterocyclization method is described for the synthesis of a diverse range of novel β-carboline C-1- and C-3-linked vinyl benzisoxazole analogues from the corresponding 2-nitro chalcones. In addition, the synthesis of β-carboline C-1-substituted quinolines (Nitramarine analogues) was achieved. The protocol was extended towards the formation of quinoline C-3-substituted benzisoxazole derivatives in good yields utilizing 2-alkynyl-3-formyl quinolines and 2-nitroacetophenone as templates. The scope of our strategy was demonstrated with the synthesis of a library of 56 novel molecules. The synthesized benzisoxazole derivatives had light-emitting properties to deliver a fluorescence quantum yield up to 33%.

Synthesis of 2-Aryl Indazole: Synthesis, Biological Evaluationand In-Silico Studies

In this work, a highly effective synthesis technique for obtaining aryl indazole under mild circumstances is provided, using trimethyl phosphine as a powerful reagent. The procedure shows that a wide range of substrates can be investigated, yielding various 2-aryl indazole derivatives with acceptable to exceptional yields and a wide range of functional group tolerance. Additionally, based on In Silico studies tests were conducted to determine the anticancer activity In Vitro for all produced compounds (3 a-3 j) against A549, HT-29 and HepG2 cell lines. Compounds 3 c and 3 d, with IC50 values of 15, 53.55, 7.34, 7.10, 56.28, and 17.87 (μM) against A549, HT-29 and HepG2 respectively, showed significant anticancer activity.

Reactivity of metal dioxo complexes

Metal dioxo chemistry and its diverse reactivity are presented with an emphasis on the mechanisms of reactivity. Work from approximately the last decade is surveyed and organized by metal. In particular, the chemistry of cis-dioxo metal complexes is discussed at length. Reactions are grouped by generic type, including addition across a metal oxo bond, oxygen atom transfer, and radical atom transfer reactions. Attention is given to advances in deoxygenation chemistry, oxidation chemistry, and reductive transformations.

Deoxygenation reactions in organic synthesis catalyzed by dioxomolybdenum(VI) complexes

Dioxomolybdenum(VI) complexes have been applied as efficient, inexpensive and benign catalysts to deoxygenation reactions of a diverse number of compounds in the last two decades. Dioxomolybdenum complexes have demonstrated wide applicability to the deoxygenation of sulfoxides into sulfides and reduction of N-O bonds. Even the challenging nitro functional group was efficiently deoxygenated, affording amines or diverse heterocycles after reductive cyclization reactions. More recently, carbon-based substrates like epoxides, alcohols and ketones have been successfully deoxygenated. Also, dioxomolybdenum complexes accomplished deoxydehydration (DODH) reactions of biomass-derived vicinal 1,2-diols, affording valuable alkenes. The choice of the catalytic systems and reductant is decisive to achieve the desired transformation. Commonly found reducing agents involved phosphorous-based compounds, silanes, molecular hydrogen, or even glycols and other alcohols.