Synthesis of some indole derivatives with potential antiinflammatory activity

2-Methylindole-3-acethydrazide (1) was reacted with arylisothiocyanate to give the corresponding 4-arylthiosemicarbazides 2a-d. Cyclization of the latter gave the corresponding 3-mercapto-5-[3-(2-methylindolyl)methyl]-1,2,4-triazoles 3a-d. Compounds 3a-c reacted with chloroacetic acid to give the corresponding indolyl-1,2,4-triazolythioglycolic acids 4a-c. The methylmercapto derivative 5 was also obtained from 3a and methyliodide. The hydrazide 1 was also reacted with carbon disulfide to give the corresponding indolymethyl-1,3,4-oxadiazole-2-thione (6) which was condensed with piperidine and formaldehyde to give the corresponding Mannich base 7. Condensation of 1 with aromatic aldehydes gave the corresponding hydrazones 8a-c which were converted into the corresponding oxadiazolines 9a-c.     

Synthesis and antiinflammatory activity of coumarin derivatives

The synthesis of several coumarin Mannich bases is described. The structures of the synthesized compounds were confirmed by spectral and elemental analysis. Their lipophilicity was determined experimentally by RPTLC method. All compounds were evaluated for their antiinflammatory and antioxidant activity and for their ability to inhibit in vitro lipoxygenase. The derivatives were found to present antioxidant and antiinflammatory activities. The tested derivatives inhibited carraggeenin-induced hind paw edema. They also significantly suppressed the arthritis induced by Freund's adjuvant. Compound 10, the most active in vivo, was found to possess protective properties against adjuvant-induced arthritis in rats. The biological in vitro activities were concentration dependent. Hydrophilicity, the presence of a free 7-OH, and steric requirements for the substituent at position 8 are the most important factors in terms of SAR. An attempt was made to correlate several physicochemical properties of the molecules with their in vivo/in vitro activity.     

Structure and antiinflammatory activity relationships of wogonin derivatives

A number of wogonin derivatives have been synthesized as congeners of wogonin and evaluated for their inhibitory activities of PGE2 production. Wogonin derivatives modified at the B ring of wogonin were obtained from 2,4-Dihydroxy-3,6-dimethoxyacetophenone (1) via several steps. Most wogonin derivatives exhibited much reduced inhibitory activities against COX-2 catalyzed PGE2 production compared to that of wogonin. Alkylation of 5,7-phenol groups and substitution at the B ring of wogonin generally caused reduction of inhibitory activity.     

Synthesis and antiinflammatory activity of various 1,4-benzothiazine derivatives

A new series of dihydro-4H-1,4-benzothiazine derivatives was prepared. These compounds were obtained by reductive N-alkylation reaction with sodium borohydride in acetic acid of the corresponding 4H-1,4-benzothiazine. Some of the latter compounds were synthesized by a new synthetic method employing 2-aminobenzenethiol and alkynes as starting material. Preliminary pharmacological data on the antiinflammatory activity of these compounds by using carrageenin paw edema assay are reported.     

Synthesis of carboxyalkylthio-triazoles and bicyclic derivatives with antiinflammatory and analgesic activity.

3-Carboxyalkylthio derivatives of 5-alkoxyphenyl-1,2,4-triazole were prepared, performing some substitutions both on carboxyalkyl chain, by lengthening it or introducing substituents with increasing molecular weight in alpha- at the carboxy group, and on N-4 atom in the triazole ring, by introducing an amino or methyl group, so that to vary steric conformation along with the lipophilicity of molecules. The corresponding bicyclic thiazolo-triazolone and triazolo-thiazinone derivatives, which represent the rigid models of carboxymethylthio- and carboxyethylthio- open structures, were also obtained. All the compounds show "in vivo" antiinflammatory activity, while only carboxyalkylthio derivatives of 4-amino- and 4-methyltriazole display an appreciable analgesic one. From the relief of some data on substituent present in the synthesized compounds, a structure-activity relationship is also suggested.     

Synthesis and evaluation of antiinflammatory activity of substituted chalcone derivatives

In an effort to develop potent antiinflammatory agents, a series of substituted chalcone derivatives was synthesized and evaluated for antiinflammatory activity through monitoring of their ability to inhibit xylene-induced ear edema in mice. Some of the tested compounds exhibited significant activity, and compounds 3f [(E)-1-(2,4-dihydroxyphenyl)-3-(4-dimethylamino)phenyl)prop-2-en-1-one] and 3h [(E)-3-(4-chlorophenyl)-1-(2,4-dihydroxyphenyl)prop-2-en-1-one] showed the highest antiinflammatory activity (62 and 68% inhibition, respectively, 2 h before administration), comparable with or even slightly more potent than the reference drug ibuprofen (53%). Furthermore, the structure–activity relationship of these substituted chalcone derivatives was demonstrated.     

Synthesis,antiinflammatory and analgesic activity of new hexahydropyrimidine derivatives

A number of potentially active hexahydropyrimidine derivatives of pharmaceutical interest have been synthesized. Various diSchiff's bases prepared by reacting different aromatic aldehydes with 1,3-diaminopropane were suitably reduced to give their tetrahydro derivatives which were then condensed with appropriate aldehydes to give a series of hitherto unreported hexahydropyrimidines. The resulting products were evaluated by oral route for their antiinflammatory activity. The activity of compounds 11, 23 and 4 was excellent and comparable to indomethacin. In addition to oral route of administration, the antiinflammatory activity of hexahydropyrimidine derivatives was also studied topically through transdermal gels. Compounds 11, 23, 4 and 22 produced significant inhibition in edema and showed good antiinflammatory activity comparable to diclofenac sodium gel (Relaxyl gel). All these compounds were also tested for their analgesic activity and their LD50 determined. Compounds 11, 20 and 23 showed a comparable activity with aspirin. The MTD for all the compounds was found to be > 1800 mg/kg.     

Substituted phenylthiophenylamines with antiinflammatory activity

Several acid and closely related non acid derivatives of 2-phenylthio- and 4-phenylthio-N-acyl phenylamines have been synthesized and tested in vivo, on the carrageenan RFE assay, and in vitro, on prostaglandin synthesis inhibition assay. Compound (XV c), bearing a propanoic acid substituent together with a p-chlorobenzoyl group situated on nitrogen atom in the 2-position, showed a 79% edema reduction (300 mg/kg p.o.) 6 hours after carrageenan injection, but no activity in vitro. The benzyl alcohols (XIV m) and (XIV n), on the contrary, inhibited PG synthesis; their lack of activity in vivo could be interpreted as the result of their oxidation to the inactive benzoic acids (XIV g) and (XIV h).     

4-苯甲酰胺基苯磺酰胺类化合物的合成及其抗炎活性

目的 设计并合成4-苯甲酰胺基苯磺酰胺类化合物，研究其抗炎活性和构效关系。方法 以取代苯甲酸为原料合成目标化合物，并以二甲苯致小鼠耳肿胀模型测试目标化合物的抗炎活性。结果 共合成7个化合物(其中6个化合物未见CA报道)，经红外光谱、核磁共振氢谱和质谱确证其结构，部分化合物对二甲苯致耳肿胀具有较强的抑制作用，并初步总结了构效关系。结论 4-苯甲酰胺基苯磺酰胺类化合物具有较强的抗炎活性。     

Biological study of naphthalene derivatives with antiinflammatory activities

In this study, 18 synthetic naphthalene derivatives were tested for their inhibitory effects on the activation of neutrophils stimulated with N‐formyl‐methionyl‐leucyl‐phenylalanine (fMLP) or phorbol myristic acetate (PMA). Some of these compounds showed significant antiinflammatory activities. In general, esterification of 1‐naphthalene to compound 14 (2‐hydroxymethyl‐1‐naphthol diacetate; TAC) enhanced the antioxidant activity. Compound 15, N,N‐bis(2‐hydroxy‐1‐naphthylmethyl) amine, has moderate inhibitory activity on neutrophils stimulated with fMLP as compared to Mannich bases of naphthylene derivatives. Either substitution at 1 or 2 position, except TAC, disfavored the inhibitory effects evoked by PMA stimulation. The influence of these compounds on the release of granule enzyme lysozyme‐induced by fMLP was measured. TAC had the highest potency on the inhibition of lysozyme release from rat neutrophil degranulation. The effects of TAC on ionic currents in a mouse neuroblastoma and rat glioma hybrid cell line, NG105‐18, were also investigated with the aid of the whole‐cell patch‐clamp technique. TAC caused an inhibitory effect on voltage‐dependent L‐type Ca²⁺ current (I_Ca,L) with an IC₅₀ value of 0.8 µM. The inhibitory effect of TAC on I_Ca,L may not be caused by its inhibition of superoxide formation. Such an effect may, also in part, affect neuronal function. Drug. Dev. Res. 60:261–269, 2003. © 2003 Wiley‐Liss, Inc.