Ligand-free copper(0) catalyzed direct C–H arylation of 1,2,4-triazoles and 1,3,4-oxadiazoles with aryl iodides in PEG-400

Synthesis of 3,4,5-Trisubstituted 1,2,4-Triazoles via I2-Catalyzed Cycloaddition of Amidines with Hydrazones

A general and practical method for the construction of various 3,4,5-trisubstituted 1,2,4-triazoles via I2-catalyzed cycloaddition of N-functionalized amidines with hydrazones is reported. This strategy features cheap and readily available catalyst and starting materials, broader substrate scope, and moderate-to-good yields. The mechanism study shows that the existence of hydrogen on the nitrogen of hydrazones is crucial for this transformation.

A One-Pot Synthesis-Functionalization Strategy for Streamlined Access to 2,5-Disubstituted 1,3,4-Oxadiazoles from Carboxylic Acids

A one-pot 1,3,4-oxadiazole synthesis-arylation strategy for accessing 2,5-disubstituted 1,3,4-oxadiazoles, from carboxylic acids, N-isocyaniminotriphenylphosphorane (NIITP), and aryl iodides, is reported. The reaction sequence, featuring a second stage copper-catalyzed 1,3,4-oxadiazole arylation, was found to tolerate (hetero)aryl, alkyl, and alkenyl carboxylic acids, and (hetero)aryl iodide coupling partners. The effectiveness of the two-stage strategy was exemplified by the late-stage functionalization of five carboxylic acid-containing APIs, and an extension to the synthesis of aminated 1,3,4-oxadiazoles using N-benzoyloxy amine coupling partners was also demonstrated.

In Vitro Biological Estimation of 1,2,3-Triazolo[4,5-d]pyrimidine Derivatives as Anti-breast Cancer Agent: DFT, QSAR and Docking Studies

Background & Objective:

Series of synthesized molecular compounds were considered as anti-breast cancer. The molecular descriptors which describe the microbial activities of the studied compounds were calculated using theoretical approach.

Methods:

The calculated parameters obtained EHOMO (eV), ELUMO (eV), dipole moment (Debye), log P, molecular weight (amu), HBA, HBD, Vol and Ovality were screened. The obtained calculated descriptors were used to develop QSAR model for prediction of experimental inhibition concentration (IC50) using SPSS and Gretl software packages for multiple linear regression (MLR) and MATLAB for the artificial neural network (ANN).

Results:

From this statistical analysis, MLR and ANN were observed to be predictive, however, ANNQSAR model predicted more efficiently than MLR.

Conclusion:

Furthermore, molecular docking study was executed with breast cancer cell line (PDB ID: 1hi7); it was observed that BS20 with binding energy of -7.0 kcal/mol bounded more efficiently than other compounds also, it inhibited more than the standard used (5-FU).

Metal-catalyzed direct heteroarylation of C-H (meso) bonds in porphyrins: facile synthesis and photophysical properties of novel meso-heteroaromatic appended porphyrins

A simple and rapid microwave-assisted synthesis of heteroaromatic appended porphyrins using the Pd/Cu-catalyzed C-C coupling of meso-bromoporphyrins with various five- and six-membered heteroaromatic azoles has been successfully developed. The prepared heteroaromatic porphyrins 7a-lNi were found to exhibit slightly red-shifted (∼5-10 nm) Soret and Q bands. The developed reaction conditions are useful for the preparation of diversely substituted heteroaromatic porphyrins (A₃B- and A₂B₂-types).

n-Bu4NI/TBHP-catalyzed C–N bond formation via cross-dehydrogenative coupling of 1H-1,2,4-triazoles (N–H) and methylarenes (Csp3–H)

An efficient n-Bu₄NI/TBHP-catalyzed protocol for C–N bond formation via cross-dehydrogenative coupling of 1H-1,2,4-triazoles (N–H) and methylarenes (C_sp3–H) has been developed under metal free conditions.

Regioselective copper-diamine-catalyzed C–H arylation of 1,2,4-triazole ring with aryl bromides

A bench-top protocol using simple Cu-diamine catalysis for the regioselective C5–H arylation of 1,2,4-triazole ring with (hetero)aryl bromides.