Efficient Syntheses of 5-Aminoalkyl-1H-tetrazoles and of Polyamines Incorporating Tetrazole Rings
摘要:
Linear N-omega-tritylated omega-amino th iobenzylam ides and N-alpha,N-omega-ditritylated polyamino mono- or bisthioamides were efficiently converted to the corresponding tetrazole derivatives upon treatment with azidotrimethylsilane under Mitsunobu reaction conditions.
Synthesis of Novel G Factor or Chloroquine-Artemisinin Hybrids and Conjugates with Potent Antiplasmodial Activity
摘要:
A series of novel hybrids of artemisinin (ART) with either a phytormone endoperoxide G factor analogue (GMeP) or chloroquine (CQ) and conjugates of the same compounds with the polyamines (PAs), spermidine (Spd), and homospermidine (Hsd) were synthesized and their antiplasmodial activity was evaluated using the CQ-resistant P. falciparum FcB1/Colombia strain. The ART-GMeP hybrid 5 and compounds 9 and 10 which are conjugates of Spd and Hsd with two molecules of ART and one molecule of GMeP, were the most potent with IC50 values of 2.6, 8.4, and 10.6 nM, respectively. The same compounds also presented the highest selectivity indexes against the primary human fibroblast cell line AB943 ranging from 16 372 for the hybrid 5 to 983 for the conjugate 10 of Hsd.
Synthetic studies toward the development of novel minoxidil analogs and conjugates with polyamines
作者:George E. Magoulas、Stavros E. Bariamis、Constantinos M. Athanassopoulos、Dionissios Papaioannou
DOI:10.1016/j.tetlet.2010.02.037
日期:2010.4
Syntheses of novel polyamine-modified minoxidil analogs (PMMs) and minoxidil-polyamine conjugates (MPCs) are described in an effort to improve the biological activity and selectivity of minoxidil and its poor solubility in water. (C) 2010 Elsevier Ltd. All rights reserved.
Simple syntheses of the polyamine alkaloid tenuilobine and analogues using selectively N-tritylated polyamines and dicarboxylic acids as bridging elements
Selectively N-tritylated spermidine and spermine derivatives and the monophenacyl ester of 1,16-hexadecanedioic acid (Hda) were used to obtain the polyamine alkaloid tenuilobine and its fully reduced analogue. Other symmetric or side-chain-shortened tenuilobine analogues were readily obtained by using Hda or its dichloride or succinic anhydride to bridge the polyamine moieties. (C) 2002 Elsevier Science Ltd. All rights reserved.