One-pot synthesis via 1, 3-dipolar cycloaddition reaction to piperazinyl-quinolinyl dispiro heterocyclic derivatives and spectrofluorometric and molecular docking studies on their binding with human serum albumin

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.

Quinolines, a perpetual, multipurpose scaffold in medicinal chemistry

Quinoline is a versatile pharmacophore, a privileged scaffold and an outstanding fused heterocyclic compound with a wide range of pharmacological prospective such as anticancer, anti-inflammatory, antibacterial, antiviral drug and superlative moiety in drug discovery. The quinoline hybrids have already been shown excellent results with new targets with a different mode of actions as an inhibitor of cell proliferation by cell cycle arrest, apoptosis, angiogenesis, disruption of cell migration and modulation. This review emphasized the mode of action, structure activity relationship and molecular docking to reveal the various active pharmacophores of quinoline hybrids accountable for novel anticancer, anti-inflammatory, antibacterial and miscellaneous activities. Therefore, several quinoline candidates are under clinical trials for the treatment of certain diseases, for example ferroquine (antimalarial), dactolisib (antitumor) and pelitinib (EGFR TK inhibitors) etc. Plenty of research has been summarized the recent advances of quinoline derivatives and explore the various therapeutic prospects of this moiety. This review would help the researchers to strategically design diverse novel quinoline derivatives for the development of clinically viable drug candidates for the treatment of incurable diseases.

Skeletal rearrangement of arylmethylideneimidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazine-2,7-diones in the synthesis of the corresponding imidazo[4,5-e]thiazolo[2,3-c]-1,2,4-triazine-2,8-diones

The synthesis of benzylideneimidazo[4,5-e]thiazolo[2,3-c]- 1,2,4-triazines via an alkali-induced skeletal rearrangement of imidazo[4,5-e]thiazolo[3,2-b]-1,2,4-triazines is reported.

Protein-Localized Bright-Red Fluorescent Gold Nanoclusters as Cyanide-Selective Colorimetric and Fluorometric Nanoprobes

Herein, we describe a bright-red-emitting ovalbumin-protected gold nanoclusters (OVA-AuNCs) that were prepared and applied as a luminescent probe for a simple, rapid, and highly sensitive determination of cyanide ions (CN- ions) based on an emission quenching and colorimetric method. Initially, an intense red-emissive fluorescence of the OVA-AuNCs successfully disappeared upon the addition of CN- ions. The resultant emission-quenching process involved CN- ions etching the OVA-AuNC surface, which produced AuCN2 - complexes in the presence of ambient oxygen. Under optimized experimental conditions, the relative emission intensity is inversely relative to CN- ion concentrations ranging from 5.00 × 10-7 to 75.00 × 10-7 mol/L with a linear correlation coefficient of 0.9932. Furthermore, OVA-AuNC-based optical detection systems on both colorimetric and fluorometric assays were tested, which expose highly sensitive and specific determination of CN- ions, and it is easily visualized by the naked eye (day light and UV light). Because of the distinct Elsner reaction between Au atoms of OVA-AuNCs and CN- ions, the recent nanoprobe offered ultrasensitivity and good selectivity with the lowest limit of detection value of 68.00 × 10-9 mol/L. In addition, this fluorescence "turn-off" CN- ion detection method was executed in real water samples. The demonstrated route of OVA-AuNC preparation is extremely easy and quick, making the proposed selective and sensitive CN- ion sensing assay based on the fluorescence response of the OVA-AuNCs for numerous practical applications.