B. Palakshi Reddy

Marine actinobacterial mediated gold nanoparticles synthesis and their antimalarial activity

UNLABELLED Streptomyces sp LK-3 (JF710608) mediated Gold nanoparticles (Au-N-LK3) were found within the size range of 5-50 nm. Au-N-LK3 treatment in Plasmodium berghei ANKA (PbA) infected mice delayed the parasitemia rise (~6%) compared to PbA infection on 8 days post infection. Survivability of mice increases to ~85% in Au-N-LK3 treated mice in contrast to in PbA (~50%) infected mice in 8 dpi with respect to control. During Au-N-LK3 treatment in PbA infection, histomorphological analysis revealed as such no change in spleen and liver tissue during 8 dpi. Our results confirmed up-regulation of TGF-β and down-regulation of TNF-α in tissue and serum level in PbA infected Au-N-LK3 treated mice compared to PbA infection. No significant changes were found in the hatchability of Artemia embryos upto 8 mg. The results obtained suggest that the Au-N-LK3 possess anti-malarial activity and could be considered as a potential source for anti-malarial drug development. FROM THE CLINICAL EDITOR These investigators present a method of marine actinobacteria mediated synthesis of gold nanoparticles, resulting in nanoparticles that possess anti-malarial activity and could be considered in future anti-malarial drug development.

Hantzsch 1,4-dihydropyridine esters and analogs: candidates for generating reproducible one-dimensional packing motifs.

Examination of the symmetric Hantzsch 1,4-dihydropyridine ester derivatives of the prototypical nifedipine molecule indicates the tendency of this class of molecule to form a common packing motif. Crystal structure analysis of 2,6-dimethyl-1,4-dihydropyridine-3,5-dicarboxylic diesters and analogs reveals that they form extended chains, characterized as the C(6) packing motif, via intermolecular (amine) N-H...O=C (C3,C5 carbonyl) hydrogen bonds. In addition, all the prepared derivatives also satisfy the basic structural requirements for their high binding efficiency to the receptor. The reproducible C(6) packing motif observed among these compounds has a use in the design of solid-state materials.

Ultrasound-promoted synthesis of novel bipodal and tripodalpiperidin-4-ones and silica chloride mediated conversion to its piperidin-4-ols: synthesis and structural confinements.

The ultrasound-promoted synthesis of novel bipodal and tripodalpiperidin-4-ones was carried out by the reaction of 4-piperidone hydrochloride monohydrate with different alkylating and acylating agents. It was preferably reduced to respective piperidin-4-ols by ultrasonic irradiation using silica chloride, which maintains higher yields by acting as an effective supporting polymer. The sterically hindered phthaloyl derivative of piperidin-4-one was synthesized by ultrasonic irradiation which was difficult by conventional methods.

1-(6-Chloro-2-methyl-4-phenyl­quinolin-3-yl)-3-(3-methoxy­phen­yl)prop-2-en-1-one

In the title compound, C26H20ClNO2, the quinoline ring system is approximately planar with a maximum deviation of 0.028 (2) Å and forms a dihedral angle of 73.84 (5)° with the phenyl ring. Two neighbouring molecules are arranged into a centrosymmetric dimer through a pair of intermolecular C—H⋯Cl interactions. A pair of intermolecular C—H⋯O hydrogen bonds link two methoxyphenyl groups into another centrosymmetric dimer, generating an R 2 2(8) ring motif. The structure is further stabilized by C—H⋯π interactions.

PEG400-Lithium Carbonate Catalyzed Synthesis of 1,4-Dihydropyridines under Solvent-free Conditions

Hantzsch 1,4-dihydropyridines (1,4-DHPs) are useful as vasodilators, bronchodilator and anti-hypertensive, hepta-protective, anti-tumor, anti-mutagenic, gero-protective and anti-diabetic agents. 1 ...

3-Hy-droxy-2-[(2-hy-droxy-4,4-dimethyl-6-oxocyclo-hex-1-en-1-yl)(3-nitro-phen-yl)meth-yl]-5,5-dimethyl-cyclo-hex-2-en-1-one.

Each of the cyclohexenone rings in the title compound, C23H27NO6, adopts a half-chair (envelope) conformation with the C atom carrying the methyl groups lying out of the plane defined by the five remaining C atoms; the O atoms lie to the same side of the molecule as the respective >C(CH3)2 atoms. The hydroxy and carbonyl O atoms face each other and are orientated to allow for the formation of two intramolecular O—H⋯O hydrogen bonds. In the crystal, the presence of C—H⋯O contacts leads to the formation of supramolecular chains along the b axis. These aggregate into layers that stack along c.

1-(6-Chloro-2-methyl-4-phenyl-3-quinol­yl)ethanone

In the title compound, C18H14ClNO, the quinoline ring system is approximately planar with a maximum devation of 0.022 (1) Å and forms a dihedral angle of 62.70 (3)° with the phenyl ring. In the crystal, pairs of C—H⋯O intermolecular hydrogen bonds link neighbouring molecules into inversion dimers, forming R 2 2(14) ring motifs. These inversion dimers are stacked along the b axis. The structure is further stabilized by C—H⋯π interactions.

Ultrasound-mediated, uranyl nitrate hexahydrate-catalyzed synthesis of 1,4-dihydropyridines under mild conditions

Synthesis of 1,4-dihydropyridines by three-component condensation reaction of aldehyde, 1,3-dicarbonyl compounds, and ammonium acetate have been found to be efficiently catalyzed by uranyl nitrate hexahydrate [UO2(NO3)2·6H2O] at room temperature under ultrasound irradiation. This novel synthetic method offers the advantages of high yields, short reaction times, simplicity, and easy workup compared to the conventional methods reported in the literature.

Regioselective synthesis and biological evaluation of novel bis(2-chloroquinolines)

Reaction of substituted 2,4-dichloroquinolines with bisphenol A in the presence of K2CO3 leads to novel bis(2-chloroquinolines) with high regioselectivity. All the synthesized compounds were characterized by use of spectral data. Preliminary evaluation of in-vitro antibacterial activity against a variety of Gram-positive and Gram-negative organisms was also conducted.

4a-Hy-droxy-9-(2-meth-oxy-phen-yl)-4,4a,5,6,7,8,9,9a-octa-hydro-3H-xanthene-1,8(2H)-dione.

In the title compound, C(20)H(22)O(5), an S(6) ring motif is formed by an intra-molecular C-H⋯O hydrogen bond, which contributes to the stabilization of the mol-ecule. In the xanthene system, the cyclo-hexane ring adopts a chair conformation, the cyclo-hexene ring adopts a half-boat conformation and the tetra-hydro-pyran ring adopts a half-chair conformation. The mean plane of the four essentially planar atoms of the tetra-hydro-pyran ring [r.m.s deviation = 0.092 (1) Å] forms a dihedral angle of 64.13 (6)° with the mean plane of the meth-oxy-phenyl group. In the crystal, inter-molecular O-H⋯O and weak C-H⋯O hydrogen bonds link mol-ecules into chains along the a axis, which are further stabilized by C-H⋯π inter-actions.