Regioselective and Stereoselective Addition of Tetrazole Derivatives to Electron-poor Acetylenic Esters in the Presence of Triphenylphosphine

Syntheses and Biological Activities of triazole-based Sulfonamides

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The triazole and sulfonamide compounds are known as biologically active agents that were employed for medicinal applications. These compounds were obtained in different forms by a variety of techniques to vast ranges of applications. The broad biological properties of these compounds have encouraged researchers to design and synthesize triazole-based sulfonamide derivatives as compounds with potential biological activity. In this review, we summarized the synthetic procedures of triazole-based sulfonamide compounds together with their biological activities during the last two decades.

Carbon–carbon bond forming reactions of acetylenic esters and ketones within frustrated phosphane/borane Lewis pair frameworks

The three-component reactions of bulky diarylbutenylphosphanes with dimethyl acetylenedicarboxylate and the strong boron Lewis acid B(C₆F₅)₃ give the ylide-substituted cyclopropane derivatives.

Crystal structure of methyl 2-[5-(2-hy-droxy-phen-yl)-2H-tetra-zol-2-yl]acetate

The title compound, C10H10N4O3, was synthesized by the esterification of hy-droxy-phenyl tetra-zole. There is an intra-molecular O-H⋯N hydrogen bond present involving the hy-droxy group and the tetra-zole ring. The tetra-zole ring is inclined to the phenol ring by 2.85 (13)°, while the methyl acetate group is almost normal to the tetra-zole ring, making a dihedral angle of 82.61 (14)°. In the crystal, mol-ecules are linked by pairs of C-H⋯O hydrogen bonds, forming inversion dimers. Within the dimers, the phenol rings are linked by offset π-π inter-actions [inter-centroid distance = 3.759 (2) Å]. There are no further significant inter-molecular inter-actions present in the crystal. The hy-droxy group is disordered about positions 2 and 6 on the benzene ring, with a refined occupancy ratio of 0.531 (5):0.469 (5).