Survey reaction of 2-amino-N-(aryl) benzimidamides with ninhydrin in different conditions and investigation of reaction mechanism using density functional theory (DFT).

In this investigation, firstly, 1-(2-amino-phenyl)-N-(aryl) methane diamine derivatives were synthesized by reaction of 2-aminobenzo nitrile with aromatic amines in the presence of aluminum chloride as the catalyst. Then, the reaction of these intermediates with ninhydrin in different conditions was investigated. The reaction between ninhydrin and 2-amino-N'-(aryl) benzimidamide derivatives in water as solvent under reflux conditions resulted in the synthesis of diazepine derivatives. The same results were obtained when the reaction was done in EtOH and in the presence of a few drops of sulfuric acid at room temperature. Also, this reaction was carried out in ethanol as solvent without the presence of sulfuric acid at room temperature which resulted in the synthesis of spiro [indene-2,2'-quinazoline] derivatives. And finally, the reaction was carried out in ethanol as solvent without the presence of sulfuric acid at the reflux conditions which resulted in the synthesis of isoquinolino-quinazoline derivatives. These N-heterocycles compounds are important biologically. Mild reaction conditions, simple procedure and purification and also product diversity with changing conditions are important advantages of this method. Also, to better understanding reaction mechanism on the condensation reactions of 2-amino-N-(aryl) benzimidamides with ninhydrin in different conditions, density functional theory (DFT)-based quantum chemical methods have been applied. Calculated atomic charges suggest that the C-1 (+ 0.54 a.u.) center of ninhydrin is a better electrophile than C-2 (+ 0.42 a.u.) center.

Evaluating of OCT-4 and NANOG was differentially regulated by a new derivative indole in leukemia cell line.

BACKGROUND: The potential exists to improve treatment through characterization of tumor stem cells and identification of therapeutic targets Using OCT-4 and NANOG genes. Here we have synthesized and investigated the potential of; New Indole-3-carbaldehyde derivative (NI-3-CD) in inhibiting the expression of self-renewal regulatory factors and cancer stem cell gene in a leukemia cell line NB4. METHODOLOGY: The NB4 cells were cultured in RPMI1640 medium contained NI-3-CD and I3F (15.12-1000µg/mL) for 24, 48 and 72h. Inhibition of cell proliferation was assessed by trypan blue staining technique and MTT assay. The percentage of apoptotic cells was determined by flow cytometry analysis using Annexin V/PI apoptosis detection kit. The fold changes of NANOG/OCT4 expression against ß-actin were determined by real-time-PCR technique. Western blotting analysis was also applied for evaluating the expression of NANOG/OCT4 at protein level. Data were analyzed by student t and repeated measure tests. Differences were considered significant if (P<0.01). RESULTS: There was a significant difference in cell viability, when various concentrations of NI-3- were used for 24, 48 and 72h in comparison to I3C regarding the cellular viability. Furthermore, the NI-3-CD, had markedly elevated anticancer activity than I3C (IC50 values for novel I3C in 24, 48 and 72h were 225.77, 123.13 and 63.72M respectively while for I3C were 728.05, 407.82 and 277.92M respectively). Flow cytometry results exhibited an obviously significant augmentation in apoptotic NB4 cells. Real Time- PCR analysis indicated that the expression of NANOG/OCT4 was down regulated in compare to untreated control cells and I3C treated cells (P<0.05). In concert with RT-PCR, western blot analysis showed that the OCT4 expression in NI-3-CD treated cells was also significantly decreased in compare to both untreated control cells and I3C treated cellular populations. CONCLUSION: Our results imply that NI-3-CD treatment decreases the sphere-forming ability of NB4 cells. In summary, this study provides valuable information on the presence of stem-cell genes expression in NB4 cells.