An Efficient Approach for the Synthesis and Antitumor Evaluation of Novel Azo- and Anil-Linked with 3-Aminopyrazolo[3,4-b]pyridine

In this project, an effective procedure for constructing a new combination of pyrazolo[3,4-b]pyridine was depicted through the coupling of diazonium salt 2 of heterocyclic amine 1 with active methylene, enamine, and amidine moieties such as 3, 5, 7, and 9 at 0-5 °C in pyridine to afford hydrazinylhydrazonoyl derivatives 4, and diazenylheterocyclic derivatives 6, 8, and 10, respectively. Also, aminopyrazolo[3,4-b]pyridine 1 condensed with different aryl or heteroaryl aldehydes in EtOH/AcOH gave the corresponding aldimine 14, 15, 16. Compound 15 was cyclized via refluxing in DMF for 6 h to afford 18, while the transformation of compound 16 with an alkyl halide afforded 19a, b. The synthesized compounds, explicated by spectral data and elemental analysis, were examined for their antitumor activities. The in vitro cytotoxic activity of new pyrazolo[3,4-b]pyridines against the A2780CP, MCF-7, and HepG-2 cell lines was evaluated using the reference doxorubicin. Compounds 15 and 19a exhibited high reactivity against the A2780CP cell lines, with IC₅₀ values of 35 and 17.9 μM, respectively. Also, compound 28 had the cytotoxic potential for A2780CP and MCF-7 cell lines, with IC₅₀ values of 14.5, and 27.8 μM, respectively.

Chemistry of 2-Aminoquinolines: Synthesis, Reactivity, and Biological Activities (Part III)

Abstract:

This review described the preparation of 2-chloroquinoline-3-carbaldehyde derivatives through Vilsmeier-Haack formylation of N-arylacetamides and the use of them as a key intermediate for the preparation of 2-aminoquinoline-3-carbaldehydes. The synthesis of the 2-aminoquinolines was explained through the following chemical reactions: Claisen-Schmidt condensation, 1, 3-dipolar cycloaddition, one-pot multicomponent reactions (MCRs), and reductive amination.

Chemistry of 2-(Piperazin-1-yl) Quinoline-3-Carbaldehydes

Abstract:

This review described the preparation of 2- chloroquinoline-3-carbaldehyde derivatives 18 through Vilsmeier-Haack formylation of N-arylacetamides and the use of them as a key intermediate for the preparation of 2-(piperazin-1-yl) quinoline-3-carbaldehydes. The synthesis of the 2- (piperazin-1-yl) quinolines derivatives was explained through the following chemical reactions: acylation, sulfonylation, Claisen-Schmidt condensation, 1, 3-dipolar cycloaddition, one-pot multicomponent reactions (MCRs), reductive amination, Grignard reaction and Kabachnik-Field’s reaction.

A Review on the Recent Multicomponent Synthesis of 4H-Pyran Derivatives

Abstract:

4H-Pyran is a well-known moiety, which appears in various natural and synthetic products. These compounds include various biological activities like anti-hepatotoxic, antitumor, anti-inflammatory, antioxidant, anti-spasmolytic, diuretic, estrogenic, anticoagulant, antifungal, antiviral, anti-helminthic, antimicrobial, hypothermal, anti-tubercular, anti-HIV, herbicidal, anticonvulsant and analgesic activity. This review has summarized an overview of general strategies that allow the design of 4H-pyran derivatives via catalyzed one-pot multicomponent reactions.

Chemistry of 2-(Pipridin-1-yl) and/ or 2-(Morpholin-1-yl) Quinolines (Part II): Synthesis, Reactivity and Biological Activities

Abstract:

This review described the preparation of 2-chloroquinoline-3-carbaldehyde derivatives, through Vilsmeier-Haack formylation of N-arylacetamides and used them as a key intermediate for preparation of 2-(piperidin-1-yl) and/ or 2-(morpholin-1-yl) quinoline-3-carbaldehydes. The synthesis of the 2-(piperidin-1-yl) and/ or 2-(morpholin-1-yl) quinolines derivative were explained through the following chemical reactions: reaction with active methyl and/ or methylene component, Claisen-Schmidt condensation, one-pot multicomponent reactions (MCRs), reductive amination, Grignard reaction, etc….

Advances in the domain of 4-amino-3-mercapto-1,2,4-triazine-5-ones

This review summarizes results from a literature survey concerning the synthesis and reactions of 4-amino-3-mercapto-1,2,4-triazine-5-ones reported by research groups from 1983 to mid. 2015.