Synthesis and Application of Chiral Cyclopropane-Based Ligands in Palladium-Catalyzed Allylic Alkylation
作者:Gary A. Molander、Jason P. Burke、Patrick J. Carroll
DOI:10.1021/jo048782s
日期:2004.11.1
A series of chiral, cyclopropane-based phosphorus/sulfur ligands have been synthesized and evaluated in the palladium-catalyzedallylicalkylation of 1,3-diphenylpropenyl acetate with dimethyl malonate. Variation of the ligand substituents at phosphorus, sulfur, and the carbon backbone revealed 24d to have the optimal configuration for this reaction, giving the product in high yield and with good enantioselectivity
Influence of the Linker in Bispyridium Compounds on the Inhibition of Human Choline Kinase
作者:Ana Conejo-García、Mónica Báñez-Coronel、Rosario M. Sánchez-Martín、Agustín Rodríguez-González、Angeles Ramos、Ana Ramírez de Molina、Antonio Espinosa、Miguel Angel Gallo、Joaquín M. Campos、Juan Carlos Lacal
DOI:10.1021/jm0496537
日期:2004.10.1
Studies have been aimed to establish the structure-activity relationship that define choline kinase (ChoK) inhibitory potency and antiproliferative activity of a set of 25 bispyridinium compounds with electron-releasing groups at position 4. Here we report that, according to their inhibitory activities against human ChoK, the enzymatic inhibitory potency is closely related to the size of the linker, the 3,3'-biphenyl moiety being the most suitable. The N-methylanilino and its derivatives, 4-chloro-N-methylanilino and 3,5-dichloro-N-methylanilino, render higher ChoK inhibitory and antiproliferative activities against the HT-29 human colon cancer cell line.
Cyclopropane-Containing Polyamine Analogues Are Efficient Growth Inhibitors of a Human Prostate Tumor Xenograft in Nude Mice
作者:Benjamin Frydman、Andrei V. Blokhin、Sara Brummel、George Wilding、Yulia Maxuitenko、Aparajita Sarkar、Subhra Bhattacharya、Dawn Church、Venodhar K. Reddy、John A. Kink、Laurence J. Marton、Aldonia Valasinas、Hirak S. Basu
DOI:10.1021/jm030175u
日期:2003.10.1
Polyamine analogues 7, 10, 18, 27, and 32 containing cyclopropane rings were obtained by chemical synthesis. Their antineoplastic activities were assessed against the cultured human prostate tumor cell lines DU-145, DuPro, and PC-3. Decamines 32 and 27 exhibited variable levels of cytotoxicity against all three cell lines, while 7, 10, and 18 were efficacious against DU-145 and DuPro. Maximum tolerated doses (MTD) for all five compounds in a NCr-nu mouse model were determined at dosing schedules of q1d x 5 (ip) in two cycles with a break of 10 days between cycles. Their antitumor efficacies were then tested against DU-145 tumor xenografts in mice treated with all five agents at their respective MTDs. In addition, the efficacies of 7 and 10 against the same tumor xenograft were assessed at doses below their respective MTDs. In all experiments, administration began two weeks after tumor implantation. All compounds efficiently inhibited tumor growth for up to 50 days postimplantation, with negligible animal body weight loss. Tetramine 10 and hexamine 18 were the most efficient among the five analogues in arresting tumor growth. Tetramine 10 containing two cyclopropane rings had the lowest systemic toxicity as reflected in animal body weight loss. It was further assessed at a weekly administration regimen of (q1w x 4) in two cycles with a four-week break between the cycles. At this dosing schedule, 10 again efficiently arrested tumor growth with negligible effect on animal body weight. Tetramine 10 also arrested the growth of large tumors (ca. 2000 mm(3)) treated 66 days postimplantation. Studies on the metabolism of 10 showed that it accumulates in tumor within 6 h after the end of administration and reached a maximum level 72 h after cessation of dosing. Intracellular concentrations of 10 in liver and kidney were much smaller when compared to those in the tumor when measured 72 h after cessation of dosing. In liver and kidney, the deethyl metabolites of 10 accumulated over a 96 h period after cessation of dosing.