(Phenylmethoxy)phenyl derivatives of w-oxo- and w-tetrazolylalkanoic acids and related tetrazoles. Synthesis and evaluation as leukotriene D4 receptor antagonists
摘要:
Two series of (phenylmethoxy)phenyl compounds derived from the structure of LY163443 were synthesized and evaluated as leukotriene D4 receptor antagonists. In the OMEGA-[(phenylmethoxy)phenyl]-OMEGA-oxoalkanoic acid series, 5-[4-[(4-acetyl-2-ethyl-3-hydroxyphenyl)methoxy]phenyl]-3,3-dimethyl-5-oxopentanoic acid (8) was the most potent antagonist of LTD4-induced contractions of guinea pig ileum (pK(B) of 7.60) and LTD4 pressor response in pithed rats (ED50 of 1.4 mg/kg iv). Replacing the carboxylic acid function with 5-tetrazole gave slightly more potent compounds. In the OMEGA-[5-[[(phenylmethoxy)phenyl]alkyl]tetrazolyl]alkanoic acid series, replacing the carboxylic acid with 5-tetrazole gave compounds that were equally effective in the guinea pig ileum but more potent in vivo against the LTD4 pressor response in rat. The pK(B) value in the guinea pig ileum for 1-[2-hydroxy-3-propyl-4-[[4-[[2-[3-(1H-tetrazol-5-yl)propyl]-2H-tetrazol-5-yl]methyl]phenoxy]methyl]phenyl]ethanone (25) was 7.87 and the ED50 for antagonism of the LTD4 pressor response was 4.0 mg/kg iv. The sodium salts of 8 (9) and 25 (26) given by the iv route of administration antagonized LTD4-induced cardiovascular alterations in anesthetized rat and LTD4-induced bronchoconstriction in guinea pig in a dose-dependent manner. Oral activity was also demonstrated against the LTD4-induced bronchoconstriction in guinea pig.
6-p-Methoxyphenyl-3,4-dihydro-2H-pyran (III) and its 4,4-dimethyl analogue (IV) have been prepared and photo-oxidised. The mechanism of formation of the products, 4-p-anisoyloxybutyraldehyde (XVII) and 4-p-anisoyloxy-2,2-dimethybutyraldehyde (XVIII), is considered.
MATHUR, K. C.;SINGH, V. P., PROC. NAT. ACAD. SCI., INDIA, 1981, 51, N 2, 177-180
作者:MATHUR, K. C.、SINGH, V. P.
DOI:——
日期:——
GAUTAM, R. K.;KANNAN, S.;SAHARIA, G. S., J. INST. CHEM. (INDIA), 1984, 56, N 2, 71-75
作者:GAUTAM, R. K.、KANNAN, S.、SAHARIA, G. S.
DOI:——
日期:——
(Phenylmethoxy)phenyl derivatives of w-oxo- and w-tetrazolylalkanoic acids and related tetrazoles. Synthesis and evaluation as leukotriene D4 receptor antagonists
作者:Robert D. Dillard、Richard A. Hahn、Doris McCullough、F. Patrick Carr、Lynn E. Rinkema、Carlos R. Roman、Jerome H. Fleisch
DOI:10.1021/jm00113a014
日期:1991.9
Two series of (phenylmethoxy)phenyl compounds derived from the structure of LY163443 were synthesized and evaluated as leukotriene D4 receptor antagonists. In the OMEGA-[(phenylmethoxy)phenyl]-OMEGA-oxoalkanoic acid series, 5-[4-[(4-acetyl-2-ethyl-3-hydroxyphenyl)methoxy]phenyl]-3,3-dimethyl-5-oxopentanoic acid (8) was the most potent antagonist of LTD4-induced contractions of guinea pig ileum (pK(B) of 7.60) and LTD4 pressor response in pithed rats (ED50 of 1.4 mg/kg iv). Replacing the carboxylic acid function with 5-tetrazole gave slightly more potent compounds. In the OMEGA-[5-[[(phenylmethoxy)phenyl]alkyl]tetrazolyl]alkanoic acid series, replacing the carboxylic acid with 5-tetrazole gave compounds that were equally effective in the guinea pig ileum but more potent in vivo against the LTD4 pressor response in rat. The pK(B) value in the guinea pig ileum for 1-[2-hydroxy-3-propyl-4-[[4-[[2-[3-(1H-tetrazol-5-yl)propyl]-2H-tetrazol-5-yl]methyl]phenoxy]methyl]phenyl]ethanone (25) was 7.87 and the ED50 for antagonism of the LTD4 pressor response was 4.0 mg/kg iv. The sodium salts of 8 (9) and 25 (26) given by the iv route of administration antagonized LTD4-induced cardiovascular alterations in anesthetized rat and LTD4-induced bronchoconstriction in guinea pig in a dose-dependent manner. Oral activity was also demonstrated against the LTD4-induced bronchoconstriction in guinea pig.
Enantioselective Bromolactonization of Deactivated Olefinic Acids
A novel enantioselectivebromolactonization of α,β-unsaturated ketones using bifunctional amino-urea catalysts has been developed. The scope of the reaction is evidenced by 23 examples of halolactones bearing various functionalities with up to 99% yield and 99:1 er. Unlike typical urea catalysts that require electron-deficient substituents to enhance the hydrogen bond strength, it is interesting to