Analogs of a 4-aminothieno[2,3-d]pyrimidine lead (QB13) as modulators of P-glycoprotein substrate specificity
作者:Hans-Georg Häcker、Antje de la Haye、Katja Sterz、Gregor Schnakenburg、Michael Wiese、Michael Gütschow
DOI:10.1016/j.bmcl.2009.09.023
日期:2009.11
P-glycoprotein (P-gp) is an important factor in the development of multidrug resistance (MDR) in cancer cells. In literature reports, a thieno[ 2,3-d] pyrimidine (QB13) was described as P-gp modulator and opposed effects on the cell accumulation of distinct P-gp substrates were postulated. On the basis of this lead structure, a series of 2-alkylthio-4-aminothieno[2,3-d]pyrimidines was prepared and tested in a daunorubicin accumulation assay. Modulation of substrate specificity was shown for selected compounds in cytotoxicity (MTT) assays. (C) 2009 Elsevier Ltd. All rights reserved.
2-(Benzoylimino)thiazolidin-4-ones: Formation by an Alternative Ring Closure and Analysis of Rotational Barriers
The reactions of N-benzoyl-N′-(o-cyanoaryl)thioureas with ethyl bromoacetate under alkaline conditions led to the formation of either fused 2-(alkylsulfanyl)-4-aminopyrimidines or 2-(benzoylimino)-3-(o-cyanoaryl)thiazolidin-4-ones. The accurate application of slightly different reaction conditions allowed us to adjust the balance between the formation of the pyrimidine or thiazolidine heterocycles. Atropisomerism in the 3-(o-cyanoaryl)thiazolidin-4-ones was influenced by the size of the o-cyanoaryl ring, which was investigated by means of NMR measurements and theoretical calculations.