Recent progress on the chemistry of thieno[3,2‐ b ]quinoline derivatives (part III )

Chemistry and Biological Activity of Thieno[3,4-b]quinoline, Thieno[3,4-c] quinolone, Thieno[3,2-g]quinoline and Thieno[2,3-g]quinoline Derivatives: A Review (Part IX)

Abstract:

Over the previous decades, thieno-quinoline derivatives have acquired great interest due to their synthetic and biological applications. These reports have been disclosed on Thienoquinoline synthesis such as thieno[3,4-b]quinoline; thieno[3,4-c]quinolone; thieno [3,2-g]quinoline; thieno[2,3- g] quinoline; spiro-thieno[2,3-g]quinoline; benzo[b]thiophen-iso- quinoline derivatives, and therefore in the existent review, we provided an inclusive update on the synthesis of thienoquinolines. Characterization of the preparation methods and reactivity is categorized based on their types of reactions as addition, alkylation, chlorination, acylation, oxidation, reduction, cyclization and cyclo-condensation. Hence, this study will help the researchers to obtain knowledge from the last literature research to conquer their resolve problems in designing new compounds and processes.

Chemistry of Thieno [2,3-h]-/[3,2-h] Quinoline and Thieno [2,3-f]-/[3,2-f] Quinoline Derivatives Part (x), Reactivities, and Biological Activities

Abstract:

Several thieno [2,3-h] /[3,2-h] quinolines and thieno [2,3-f] /[3,2-f] quinolines (TQs) are discussed in this review from a few perspectives, including various preparation and processing methods employing cutting-edge machinery. The preparation of (TQs), from 4-(5)aminobenzothiophene, 2(3)chloromethylthiophene, 2(3)thienylboric acid, and other chemical reagents is illustrated via a number of chemical procedures in this review. The formation of (TQs) was clarified using the Michael addition, Photocyclization, Skraup reaction, Ullmann-Fetvadjian process, Suzuki-Miyaura and Sonogashira reaction, aza-Diels-Alder reaction, and Friedel-Crafts reaction.

Synthetic and Reactions Routes to Tetrahydrothieno[3,2-b]Quinoline Derivatives (Part IV)

Abstract:

This review describes the synthesis and chemical reactivity of tetrahydrothieno[3,2-b] quinoline derivatives from through many of the reagents such as; 1, 2-dihydropyridine-3-carbonitrile; 1,6-dihydropyrimidine-5-carbonitrile; 2,3-dihydropyridazine-4-carbonitrile; 3-amino-thiophene-2-carboxylate; 3-amino-thiophene-2-carbonitrile; 3,4-diaminothieno[2,3-b] thiophene-2,5-dicarbo- nitrile; 2-(3-bromo-1-iodoisoquinolin-8-yl) benzonitrile and 3-mercapto-benzo[g]quinolin-4(1H)-one derivatives. The synthesis of the tetrahydrothieno [3, 2-b] quinoline derivatives were explained through the following chemical reactions: Aldol condensation, alkylation, cyclocondensation, dehydration, chlorination, Wolff-Kishner reduction, acylation, Friedlander reaction and intramolecular cyclization.

Synthesis of quinolines via sequential addition and I2-mediated desulfurative cyclization

An efficient one-pot approach for the synthesis of quinolines from o-aminothiophenol and 1,3-ynone under mild conditions is disclosed. With the aid of ESI-MS analysis and parallel experiments, a three-step mechanism is proposed—a two-step Michael addition–cyclization condensation step leading to intermediate 1,5-benzothiazepine catalyzed by zirconocene amino acid complex Cp₂Zr(η¹-C₉H₁₀NO₂)₂, followed by I₂-mediated desulfurative step.

An efficient one-pot approach is proposed for the synthesis of quinolines through Lewis acid-catalyzed cyclization and iodine-mediated desulfurization reactions.