Improved Procedures for the Preparation of Cycloalkyl-, Arylalkyl-, and Arylthioureas
作者:C. R. Rasmussen、F. J. Villani, Jr.、L. E. Weaner、B. E. Reynolds、A. R. Hood、L. R. Hecker、S. O. Nortey、A. Hanslin、M. J. Costanzo、E. T. Powell、A. J. Molinari
DOI:10.1055/s-1988-27605
日期:——
An improved procedure for the preparation of arylthioureas consists of the reaction of benzoyl isothiocyanate with anilines in acetone and debenzoylation of the resultant N-aryl-N′-benzoylthioureas with 5% aqueous sodium hydroxide. Bicycloalkylthioureas and N-(arylalkyl)thioureas (e.g., 9H-9-fluorenylthiourea) are directly prepared from the corresponding isothiocyanates and ammonia.
Synthesis and QSAR Studies in 2-(N-aryl-N-aroyl)amino-4,5-dihydrothiazole Derivatives as Potential Antithrombotic Agents
作者:Anil K. Saxena、Suresh K. Pandey、P. Seth、M.P. Singh、M. Dikshit、A. Carpy
DOI:10.1016/s0968-0896(01)00082-7
日期:2001.8
A series of 2-(N-aryl-N-aroyl)amino-4,5-dihydrothiazole derivatives have been synthesized via cyclocondensation of N-aryl thioureas with 2-bromoethylamine hydrobromide followed by the reaction of the product thus obtained with aroyl chlorides. Title compounds were evaluated for their antithrombotic activity in vivo in mice where one of these compound 29 provided 65% protection as compared to 77% protection offered by the standard Indomethacin. Quantitative Structure-Activity Relationship (QSAR) studies were performed on these compounds using physicochemical (hydrophobic, electronic, steric) parameter as independent and antithrombic activity as dependent parameter, where antithrombotic activity correlated best (r > 0.8) with electronic parameters (F, sigma or mu) having high statistical significance > 99.9% (F-2,F-22 > 15.0; F-2,F-22 alpha :0.001 = 11.0) suggesting that hydrophobic, steric and resonance factors are insignificant in this set of molecules for the activity. (C) 2001 Elsevier Science Ltd. All rights reserved.
Structural requirement(s) of N-phenylthioureas and benzaldehyde thiosemicarbazones as inhibitors of melanogenesis in melanoma B 16 cells
作者:P. Thanigaimalai、Tuan Anh Le Hoang、Ki-Cheul Lee、Seong-Cheol Bang、Vinay K. Sharma、Cheong-Yong Yun、Eunmiri Roh、Bang-Yeon Hwang、Youngsoo Kim、Sang-Hun Jung
DOI:10.1016/j.bmcl.2010.02.067
日期:2010.5
In order to define the structural requirements of phenylthiourea (PTU), a series of thiourea and thiosemicarbazone analogs were prepared and evaluated as inhibitors of melanogenesis in melanoma B16 cells. The most potent analog was 2-(4-tert-butylbenzylidene)hydrazinecarbothioamide (1u) with an IC50 value of 2.7 mu M in inhibition of melanogenesis. The structure for potent inhibitory activity of these derivatives are required with the direct connection of pi-planar structure to thiourea without steric hinderance in PTU derivatives and the hydrophobic substituent at para position in case of semicarbazones. (C) 2010 Published by Elsevier Ltd.
Synergism of fused bicyclic 2-aminothiazolyl compounds with polymyxin B against <i>Klebsiella pneumoniae</i>
A series of fused bicyclic 2-aminothiazolyl compounds were synthesized and evaluated for their synergistic effects with polymyxin B (PB) against Klebsiella pneumoniae (SIPI-KPN-1712).