α,β-Unsaturated carboxylic acids undergo Rh(III)-catalyzed decarboxylative coupling with α,β-unsaturated O-pivaloyl oximes to provide substituted pyridines in good yield. The carboxylic acid, which is removed by decarboxylation, serves as a traceless activating group, giving 5-substituted pyridines with very high levels of regioselectivity. Mechanistic studies rule out a picolinic acid intermed...

Sporulation of Bacillus subtilis is inhibited by low concentrations ( l mM) of these agents also inhibit growth and cause cell lysis. In the presence of the chelating agents, 14C-glutamate produces the accumulation of citrate and 14C-glucose that of fruc...

An unprecedented two-dimensional honeycomb network based on fused triacontanuclear heterometallic wheels of 3.4 nm, {[Co2(Mn3O)(N3)2(pic)6(NO3)](-)}6 (Hpic = picolinic acid), has been assembled. The hexagonal {Co12Mn18} wheel motif is composed of six oxo-centered {Mn3} trinuclear and six {Co2} dinuclear moieties acting as nodes and linkers, respectively. The paramagnetic properties of this comp...

The fungal metabolite kojic acid, which is produced by Aspergillus and Penicillium species fungi that may be pathogens of both insects and plants, was a significant inhibitor of phenoloxidase of different representative beetle and caterpillar insect species. Fusaric acid and picolinic acid, produced by Fusarium spp., were also significant inhibitors of phenoloxidase, while dipicolinic acid and ...

The oxidation of 3-hydroxyanthranilic acid, an intermediate in the conversion of tryptophan to niacin (l-3), is catalyzed by a liver oxidase (4). The first recognized product, termed Compound I (5), yields quinolinic acid spontaneously or picolinic acid under the influence of a liver carboxylase (6). The intermediate is detectable by its absorption maximum at 360 rnp (4). Wiss and Bettendorf (7...

Comparable to many amino acids, the title compound, C(6)H(5)NO(3), is a substitution product of picolinic acid. The mol-ecule shows approximate non-crystallographic C(s) symmetry. Like many amino acids, the mol-ecule is present in its zwitterionic state. Intra- as well as inter-molecular hydrogen bonds are observed, the latter connecting the mol-ecules into zigzag chains along the crystallograp...

The reaction of 4-(dimethyl-amino)-pyridine, picolinic acid and stannic chloride yields the title monosolvated salt, (C(13)H(10)NO)[SnCl(4)(C(6)H(4)NO(2))]·CH(3)OH. The Sn(IV) atom is N,O-chelated by the picolinate ion in a cis-SnNOCl(4) octa-hedral geometry. The cation is linked to the methanol solvent mol-ecule by an O-H⋯O hydrogen bond; the solvent mol-ecule itself is a hydrogen-bond donor t...

Biosynthesis of niacin from 3-hydroxyanthranilic acid (3-OHAA) in normal and streptozotocin diabetic rats was studied in vivo and in vitro. Streptozotocin (SZ) diabetic rats were found to excrete lesser quantities of 3-OHAA, quinolinic acid, niacin and N1-methylnicotinamide (nmn) in their urines following 3-OHAA administration than corresponding normal rats. In vitro studies indicated that SZ d...