The discovery and structure—activity relationships of nonpeptide, low molecular weight antagonists selective for the endothelin ETB receptor
作者:Ming Fai Chan、Adam Kois、Erik J. Verner、Bore G. Raju、Rosario S. Castillo、Chengde Wu、Ilya Okun、Fiona D. Stavros、V.N. Balaji
DOI:10.1016/s0968-0896(98)80010-2
日期:1998.12
The systematic modification of the ETA selective N-(5-isoxazolyl)benzene-sulfonamide endothelin antagonists to give ETB selective antagonists is reported. The reversal in selectivity was brought about by substitution of the 4-position with aryl and substituted aryl groups. Of all the aromatic substituents studied, the para-tolyl group gave rise to the most active and selective ETB antagonist. Larger substituents caused a decrease in both ETB activity and selectivity. A similar trend was observed by substitution at the 5-position of the N-(5-isoxazolyl)-2-thiophenesulfonamide ETA receptor antagonists. The para-tolyl group was again found to be optimal for the ETB activity and selectivity. The structural features that were found to be favorable for binding to the ETB receptor, that is, the presence of a linear, conjugated pi-system of definite shape and size, have been successfully incorporated into the design of ETB selective polycyclic aromatic sulfonamides antagonists. (C) 1998 Elsevier Science Ltd. All rights reserved.
Nikolenko, Zhurnal Obshchei Khimii, 1956, vol. 26, p. 806;engl.Ausg.S.921
作者:Nikolenko
DOI:——
日期:——
Optimization of the synthesis of phenanthrene-2- and -3-sulfonyl chlorides
作者:V. V. Russkikh、E. A. Khokhrina、V. V. Shelkovnikov
DOI:10.1134/s1070428012040148
日期:2012.4
Sulfonation of phenanthrene with sulfuric acid, followed by neutralization with sodium hydroxide, gave a mixture of isomeric sodium phenanthrenesulfonates in an overall yield of 83%. Sodium phenanthrene-2-, -3-, and -9-sulfonates were isolated in 17, 43, and 4% yield, respectively. Sulfonation of phenanthrene with ClSO3H or SO3 did not improve the yields of phenanthrene-2- and -3-sulfonic acids. Treatment of sodium phenanthrene-2- and -3-sulfonates with PCl5-POCl3 or SOCl2-DMF afforded the corresponding sulfonyl chlorides in 89 and 87 or 69 and 70% yield, respectively. Pure phenanthrene-2- and -3-sulfonyl chlorides were also synthesized in 27 and 51% yield by reaction of a mixture of 2- and 3-sulfonates with PCl5-POCl3.
Sandqvist, Justus Liebigs Annalen der Chemie, 1909, vol. 369, p. 116
作者:Sandqvist
DOI:——
日期:——
Courtot; Kozertchouk, Comptes Rendus Hebdomadaires des Seances de l'Academie des Sciences, 1944, vol. 218, p. 973