Syntheses and crystal structures of two copper(I)-halide π,σ-coordination compounds based on 2-[(prop-2-en-1-yl)sulfan-yl]pyridine.

The title compounds, di-μ-chlorido-bis-({2-[(η-2,3)-(prop-2-en-1-yl)sulfan-yl]pyridine-κ}copper(I)), [CuCl(CHNS)], and di-μ-bromido-bis-({2-[(η-2,3)-(prop-2-en-1-yl)sulfan-yl]pyridine-κ}copper(I)), [CuBr(CHNS)], were obtained by alternating-current electrochemical synthesis starting from an ethano-lic solution of 2-[(prop-2-en-1-yl)sulfan-yl]pyridine () and the copper(II) halide. The isostructural crystals are built up from centrosymmetric [Cu ()] dimers, which are formed due to the π,σ-chelating behavior of the organic ligand. In the crystals, the dimers are linked by C-H⋯ hydrogen bonds as well as by aromatic π-π stacking inter-actions into a three-dimensional network.

Synthesis, crystal structure and Hirshfeld surface analysis of (4-methyl-phen-yl)[1-(penta-fluoro-phen-yl)-5-(tri-fluoro-meth-yl)-1-1,2,3-triazol-4-yl]methanone.

The title compound, CHFNO, was obtained the reaction of 1-azido-2,3,4,5,6-penta-fluoro-benzene with 4,4,4-tri-fluoro-1-(-tol-yl)butane-1,3-dione using tri-ethyl-amine as a base catalyst and solvent. The dihedral angles between the penta-fluoro-phenyl (), triazole () and -tolyl () rings are / = 62.3 (2), / = 43.

Synthesis, crystal structure and Hirshfeld surface analysis of 5-cyclo-propyl--(2-hy-droxy-eth-yl)-1-(4-methyl-phen-yl)-1-1,2,3-triazole-4-carboxamide.

The title compound, CHNO, was obtained a two-step synthesis (Dimroth reaction and amidation) for anti-cancer activity screening and was selected from a 1-1,2,3-triazole-4-carboxamide library. The cyclo-propyl ring is oriented almost perpendicular to the benzene ring [dihedral angle = 87.9 (1)°], while the dihedral angle between the mean plane of the cyclo-propyl ring and that of the triazole ring is 55.

Nitrileimines as an alternative to azides in base-mediated click [3 + 2] cycloaddition with methylene active nitriles.

Nitrileimines were implemented in practical click protocols with oxopropanenitriles for the straightforward 5-amino-1-pyrazole synthesis 1,3-dipolar cycloaddition. The reaction proceeds at room temperature in a short time with base catalysis and no chromatographic purification. High purity products were isolated by simple filtration.

New Convenient Strategy for Annulation of Pyrimidines to Thiophenes or Furans via the One-pot Multistep Cascade Reaction of 1H-Tetrazoles with Aliphatic Amines.

A versatile, convenient, efficient and high-yield synthetic method for 2-R(3),R(4)-amino-5-R(1)-6-R(2)-thieno[2,3-d]pyrimidin-4(3H)-ones, 2-R(3),R(4)-amino-5-R(1)-6-R(2)-thieno[3,2-d]pyrimidin-4(3H)-ones, and benzofuro[3,2-d]pyrimidin-4(3H)-ones preparation has been developed. The reaction proceeded without using solvents and included several steps. A variety of thieno[2,3-d]pyrimidine and thieno[3,2-d]pyrimidine derivatives with substituents of different nature were obtained in high yields from substituted alkyl 2-(1H-tetrazol-1-yl)thiophene-3-carboxylates, 3-(1H-tetrazol-1-yl)thiophene-2-carboxylates, and 3-(1H-tetrazol-1-yl)benzofuran-2-carboxylate after their treatment with aliphatic amines.

One-pot multicomponent synthesis of 1-aryl-5-methyl-N-R2-1H-1,2,3-triazole-4-carboxamides: an easy procedure for combinatorial chemistry.

A convenient synthetic protocol was elaborated for creation of combinatorial libraries of 1-(R(1)-phenyl)-5-methyl-N-R(2)-1H-1,2,3-triazole-4-carboxamides. As starting materials, commercially available or readily prepared azides, amines, and diketene were selected for the reaction which has proceeded in a one-pot system with high yields and in short time.