Novel Angular Benzophenazines: Dual Topoisomerase I and Topoisomerase II Inhibitors as Potential Anticancer Agents
摘要:
A series of substituted angular benzophenazines were prepared using a new synthetic route via a novel regiocontrolled condensation of 1,2-naphthoquinones and 2,3-diaminobenzoic acids. The synthesis and biological activity of this new series of substituted 8,9-benzo[a]phenazine carboxamide systems are described. The analogues were evaluated against the H69 parental human small cell lung carcinoma cell line and H69/LX4 resistant cell line which overexpresses P-glycoprotein. Selected analogues were evaluated against the COR-L23-parental human non small cell lung carcinoma cell line and the COR-L23/R resistant cell line which overexpresses multidrug resistance protein. This series of novel angular benzophenazines were potent cytotoxic agents in these cell lines and may be able to circumvent multidrug resistance mechanisms which result in the lack of efficacy of many drugs in cancer chemotherapy. These compounds show dual inhibition of topoisomerase I and topoisomerase II and thus target two key enzymes responsible for the topology of DNA that are active at different points in the cell cycle. The introduction of chirality into the carboxamide side chain of these novel benzophenazine carboxamides has resulted in the discovery of a potent enantiospecific series of cytotoxic agents, exemplified by 4-methoxy-benzo[a]phenazine-11-carboxylic acid (2-(dimethylamino)-1-(R)methyl-ethyl)-amide, XR11576 ((R)-4j"). In vivo activity has been demonstrated for 4-methoxy-benzo[a]phenazine-11-carboxylic acid (2-(dimethylamino)-1-(R)-methyl-ethyl)-amide, XR11576, after intravenous administration to female mice, and this compound has been selected as a development candidate for further evaluation.
A new synthetic route to (±)-thienamycin via 4-exo trigonal cyclisation of carbamoyl cobalt intermediates
作者:Gerald Pattenden、Stephen J. Reynolds
DOI:10.1016/0040-4039(91)80870-c
日期:1991.1
A new synthesis of (±)-thienamycin (1), based on elaboration of the key intermediate (12) in one step by heating a solution of the carbamoylcobalt salophen (11) in toluene, is described.
One-Pot Synthesis of Cyclic Nitrones and Their Conversion to Pyrrolizidines: 7a-<i>e</i><i>pi</i>-Crotanecine Inhibits α-Mannosidases
作者:S. Cicchi、M. Marradi、P. Vogel、A. Goti
DOI:10.1021/jo0523518
日期:2006.2.1
from the corresponding lactols. Its efficiency relies on the condensation of unprotected hydroxylamine with readily available lactols and on the chemoselectivity of the subsequent esterification with methanesulfonylchloride. The targeted enantiomerically pure pyrroline N-oxides are versatile synthetic intermediates: one of the nitrones so-obtained has been converted into new polyhydroxypyrrolizidines
Novel Angular Benzophenazines: Dual Topoisomerase I and Topoisomerase II Inhibitors as Potential Anticancer Agents
作者:Nigel Vicker、Luke Burgess、Irina S. Chuckowree、Rory Dodd、Adrian J. Folkes、David J. Hardick、Timothy C. Hancox、Warren Miller、John Milton、Sukhjit Sohal、Shouming Wang、Stephen P. Wren、Peter A. Charlton、Wendy Dangerfield、Chris Liddle、Prakash Mistry、Alistair J. Stewart、William A. Denny
DOI:10.1021/jm010329a
日期:2002.1.1
A series of substituted angular benzophenazines were prepared using a new synthetic route via a novel regiocontrolled condensation of 1,2-naphthoquinones and 2,3-diaminobenzoic acids. The synthesis and biological activity of this new series of substituted 8,9-benzo[a]phenazine carboxamide systems are described. The analogues were evaluated against the H69 parental human small cell lung carcinoma cell line and H69/LX4 resistant cell line which overexpresses P-glycoprotein. Selected analogues were evaluated against the COR-L23-parental human non small cell lung carcinoma cell line and the COR-L23/R resistant cell line which overexpresses multidrug resistance protein. This series of novel angular benzophenazines were potent cytotoxic agents in these cell lines and may be able to circumvent multidrug resistance mechanisms which result in the lack of efficacy of many drugs in cancer chemotherapy. These compounds show dual inhibition of topoisomerase I and topoisomerase II and thus target two key enzymes responsible for the topology of DNA that are active at different points in the cell cycle. The introduction of chirality into the carboxamide side chain of these novel benzophenazine carboxamides has resulted in the discovery of a potent enantiospecific series of cytotoxic agents, exemplified by 4-methoxy-benzo[a]phenazine-11-carboxylic acid (2-(dimethylamino)-1-(R)methyl-ethyl)-amide, XR11576 ((R)-4j"). In vivo activity has been demonstrated for 4-methoxy-benzo[a]phenazine-11-carboxylic acid (2-(dimethylamino)-1-(R)-methyl-ethyl)-amide, XR11576, after intravenous administration to female mice, and this compound has been selected as a development candidate for further evaluation.
Synthesis of (±)-thienamycin based on a new approach to β-lactams via 4-exo-trig cyclisation of carbamoylcobalt salophens
作者:Gerald Pattenden、Stephen J. Reynolds
DOI:10.1039/p19940000379
日期:——
been shown to be useful precursors in a new approach to β-lactams (viz.12-16, 21 and 31), via 4-exo-trig modes of cyclisation of the corresponding intermediate carbamoyl radicals. A new formalsynthesis of (±)-thienamycin 1 from the trans-disubstituted azetidin-2-one 31 produced in one step by heating the carbamoylcobalt salophen 30 in toluene, is also described.