NOPR Collection:

QSAR studies of 2,3-diarylpyrazolo[1,5-b]-pyridazine analogs as cyclooxygenase-2 inhibitors

Fri, 01 Dec 2006 00:00:00 GMT

Title: QSAR studies of 2,3-diarylpyrazolo[1,5-b]-pyridazine analogs as cyclooxygenase-2 inhibitors Authors: Revathi, S; Gupta, Arun Kumar; Soni, Love Kumar; Kavitha, S; Wagh, R; Kaskhedikar, S G Abstract: Cyclooxygenase-2 inhibitors arc of current interest, because these alleviate inflammation, fever, pain, rheumatic and osteoarthritis without side effects, produced by classical NSAlDs. QSAR analysis helps in exploring molecular insight, which are responsible for drug-receptor interactions. QSAR studies have been performed on a series of some 2,3-diaryl-pyrazolo[1,5-b)pyridazine analogs as COX-2 inhibitors using substituent constant in lead structure for 2D and physicochemical properties of molecules for 3D-QSAR analysis respectively. The correlations have been established using regression analysis techniques. 2D-QSAR analysis study has revealed that the substitution of hydrophobic group in the 2,3-diaryl-pyrazolo[1,5-b)pyridazines at R₂ position is favourable while substitution of bulkier group at R₂ position is unfavourable for COX-2 inhibitory activity. In 3D-model, Morl4u and Mor29v are 3D-MoRSE code have been calculated by summing atom weights which have been viewed by a different angular scattering function contributed positively to COX-2 inhibitory activity. G (O..O) is a conformational dependent descriptor based on the geometry of the molecule contributed negatively to COX-2 inhibitory activity. Page(s): 2763-2769

New method for the synthesis of 1,3,5-triarylbenzenes

Fri, 01 Dec 2006 00:00:00 GMT

Title: New method for the synthesis of 1,3,5-triarylbenzenes Authors: Jing, Xiaobi; Xu, Feng; Zhu, Qihua; Ren, Xinfeng; Li, Dong; Yan, Chaoguo; Shi, Yaocheng Abstract: Adsorbed on clayfen together with p-toluenesulfonic acid and catalytic amount of tin tetrachloride anhydrous (5%), aryl ketones are readily turned to 1,3,5-triarylbenzenes in good yields upon exposure to microwaves under solvent-free conditions. A new method for the synthesis of poly substituted benzene is developed, which is simple and rapid. Page(s): 2781-2783

Conventional and ultrasound mediated synthesis of some thiadiazoles, triazoles and oxadiazoles

Fri, 01 Dec 2006 00:00:00 GMT

Title: Conventional and ultrasound mediated synthesis of some thiadiazoles, triazoles and oxadiazoles Authors: Narwade, S K; Halnor, V B; Dalvi, N R; Gill, C H; Karale, B K Abstract: Acid hydrazide 1 when treated with aryl isothiocyanates gives the compounds 2. These compounds 2 on ultrasound irradiation in acidic medium give compounds 3 i.e. thiadiazoles and in basic medium gives compounds 4 i.e. triazoles. These compounds 2 on treatment with I₂/KI and NaOH resulted in compounds 5 i.e. oxadiazoles. These compounds are synthesized by conventional method as well as ultra sound irradiation method. Page(s): 2776-2780

A high amylose starch isolated from the tubers of Curcuma aeruginosa

Fri, 01 Dec 2006 00:00:00 GMT

Title: A high amylose starch isolated from the tubers of Curcuma aeruginosa Authors: Ranjini, C E; Vijayan, K K Abstract: NMR spectra of the starch, isolated from Curcuma aeruginosa in dimethyl sulphoxide-d_6,contain groups of minor ¹³C, ¹H, or O¹H signals attributable to glycosyl end groups and the absence of other residues associated with branching in amylopectin molecules. The relative intensities of these signals are evaluated in terms of the incidence of end groups, or branches in the starches. The configuration of the glucan has been confirmed by treatment with a amylase, and also by its high []_D²⁰value of +118.9.13. ¹³C NMR and ¹H NMR spectral studies show that it is a high amylose starch. X-ray diffraction study reveals B-type polymorphic forms characteristic of high amylose starch. They are also compared with spectrophotometric measurements on the iodine complexing capacity of starches. Page(s): 2773-2775