Propenyl carboxamide derivatives as antagonists of platelet-activating factor
摘要:
A series of N-[4-(3-pyridinyl)butyl] 3-substituted propenyl carboxamide derivatives bearing an unsaturated bicyclic moiety in the 3-position was prepared and evaluated for PAF (platelet activating factor) antagonist activity. These compounds represent conformationally constrained direct analogues of the corresponding potent 5-aryl-pentadienecarboxamides (5). Most of the new compounds were active in a PAF-binding assay employing whole, washed dog platelets as the receptor source and inhibited PAF-induced bronchoconstriction in guinea pigs after intravenous administration. However, oral activity in the PAF-induced bronchoconstriction model was highly sensitive to the nature and substitution of the bicyclic ring system. The most interesting compounds included [R-(E)]-(1-butyl-6-methoxy-2-naphthyl)-N-[1-methyl-4-(3- pyridinyl)butyl]-2-propenamide (4b), [R-(E)]-(3-butyl-6-methoxy-2- benzo[b]thiophene-yl)-N-[1-methyl-4-(3-pyridinyl)butyl]-2-propenamide (4k), and [R-(E)]-(3-butyl-6-methoxy-1-methyl-2-indoly)-N-[1-ethyl-4- (3-pyridinyl)butyl]-2-propenamide (4l) which inhibited PAF-induced broncho-constriction in guinea pigs with IC50s of 3.0-5.4 mg/kg, when the animals were challenged 2 h after drug treatment. They were also highly effective 6 h after a 50 mg/kg oral dose. This study supports the notion that the key remote aromatic ring present in the 5-arylpentadienecarboxamides (5) is preferentially coplanar with the diene system for good PAF antagonist activity.
2-[(Phenylthio)methyl]pyridine derivatives: new antiinflammatory agents
作者:Fortuna Haviv、Robert W. DeNet、Raymond J. Michaels、James D. Ratajczyk、George W. Carter、Patrick R. Young
DOI:10.1021/jm00356a018
日期:1983.2
2-[(Phenylthio)methyl]pyridine derivatives inhibited the dermal reverse passive Arthus reaction (RPAR) in the rat. In the same model, indomethacin was inactive, and hydrocortisone was active. Compounds Ia-d also significantly reduced exudate volume and white blood cell accumulation in the pleural RPAR. This pattern of activity was similar to that of hydrocortisone and different from that of indomethacin
Sulfanyl-Substituted [3]Cumulenes and Buta-1,3-dienes from a Tetrakis(pyridinium)-Substituted Butadiene
作者:Andreas Schmidt、Alireza Rahimi、Mimoza Gjikaj
DOI:10.1055/s-0029-1216861
日期:2009.7
3-dienes, or tetrakis(sulfanyl)-substituted 2,3-dichlorobuta-1,3-dienes by reactions with thiolates or a sulfinate. The outcome of the reaction depends on the reaction conditions and the substitution pattern of the starting sulfur nucleophiles. dienes and trienes - sulfides - pyridines - perchlorinated compounds - persulfurated compounds
Elimination–addition. Part XI. Electronic effects upon the reactivity of aryl vinyl sulphones towards amines
作者:S. T. McDowell、C. J. M. Stirling
DOI:10.1039/j29670000348
日期:——
Rates of addition of t-butylamine to a series of nuclear-substituted arylvinylsulphones have been measured for reactions in ethanol at 25°. The results are well correlated by the Hammett σρ relationship, the value of ρ=+1·59 being obtained with substituents possessing σ constants in the range –0·268 to +0·778. The reaction is compared with others which proceed via a carbanionic transition state.
On the basis of screening hits (1a,b), a series of selective, high affinity prostacyclin receptor antagonists was developed. The optimized lead compound 25d [(4,5-dihydro-1H-imidazol-2-yl)-[4-(4-isopropoxybenzyl)phenyl]amine] had analgesic activity in the rat.
One‐Pot Substitution‐Rearrangement Reaction of 2‐Chloroglycidic Ester: Effective Protocol for the Preparation of 3‐Arylsulfenyl‐2‐keto Ester
作者:Takuzo Komiyama、Yutaka Takaguchi、Sadao Tsuboi
DOI:10.1080/00397910500374914
日期:2006.1
Abstract The one‐pot substitution‐rearrangement reaction of 2‐chloroglycidic ester is reported. Treatment of 2‐chloroglycidic ester with sodium arylthiolate at room temperature results in the formation of 3‐arylsulfenyl‐2‐keto ester in excellent to good yields.