Synthesis, Spectroscopic Characterization, and In Vitro Antimicrobial Potency of Sulfur-Bonded Complexes of Boron(III)
摘要:
The present article describes the synthesis and characterization of tetracoordinated boron (III) complexes with monobasic bidentate ligands ((LH)-H-1, (LH)-H-2, (LH)-H-3, (LH)-H-4, (LH)-H-5, and (LH)-H-6) having the general formulae PhB(L)(OH) and PhB(L)(2). The 1:1 and 1: 2 reactions of phenyl boronic acid with monobasic bidentate ligands resulted in the formation of colored solids. The complexes have been characterized by elemental analysis, molecular weight determinations, and IR and NMR (H-1, C-13 and B-11) spectroscopy, as well as UV-vis spectral studies. Based on these studies, a tetrahedral geometry has been proposed for the resulting complexes. The ligands, along with their complexes, have been screened in vitro against a number of pathogenic fungal and bacterial strains. The studies indicate that the boron chelates are more potent than the parent ligands.
Synthesis, Spectroscopic Characterization, and In Vitro Antimicrobial Potency of Sulfur-Bonded Complexes of Boron(III)
摘要:
The present article describes the synthesis and characterization of tetracoordinated boron (III) complexes with monobasic bidentate ligands ((LH)-H-1, (LH)-H-2, (LH)-H-3, (LH)-H-4, (LH)-H-5, and (LH)-H-6) having the general formulae PhB(L)(OH) and PhB(L)(2). The 1:1 and 1: 2 reactions of phenyl boronic acid with monobasic bidentate ligands resulted in the formation of colored solids. The complexes have been characterized by elemental analysis, molecular weight determinations, and IR and NMR (H-1, C-13 and B-11) spectroscopy, as well as UV-vis spectral studies. Based on these studies, a tetrahedral geometry has been proposed for the resulting complexes. The ligands, along with their complexes, have been screened in vitro against a number of pathogenic fungal and bacterial strains. The studies indicate that the boron chelates are more potent than the parent ligands.
An unprecedented cascade reaction of isocyanide and methyleneindolinone has been established, which represents a novel and different reaction mode. This present transformation involves the ring-opening of methyleneindolinone and the construction of two other new rings simultaneously in an atom-economic manner.
A mild and efficient reaction of the Bestmann–Ohirareagent with N-unprotected isatin-derived olefins has been developed for the selective synthesis of spiro-pyrazoline-oxindoles and tricyclic pyrazoles. The reaction features an attractive product-selectivity depending on the substituent on isatin-derived olefin. Treatment of 3-aryl/alkylideneoxindoles with BOR afforded spiropyrazoline-oxindoles, whereas