Synthesis and antitumor characterization of pyrazolic analogues of the marine pyrroloquinoline alkaloids: wakayin and tsitsikammamines.
A series of aza analogues of the marine alkaloids wakayin and tsitsikammamines A and B have been synthesized. The strategy used was based on [3 + 2] cycloaddition reactions involving 3-ethylamine-indole-4,7-dione and different diazo reagents. All the compounds were evaluated in vitro for antiproliferative activity against five distinct cancer cell lines and for their inhibitory effect on topoisomerase isoenzymes I and II. Some of the compounds inhibited the topoisomerase I and/or II catalyzed relaxation of supercoiled DNA at a concentration comparable to the drugs camptothecin and etoposide. Only a few of them exhibited cytotoxic activity with IC50 values in the micromolar range.
Legentil
Laurent
L
Laboratoire SPCMIB, UMR-CNRS 5068, Université Paul Sabatier, 118 route de Narbonne, 31062, Toulouse Cedex 4, France.
Benel
Laurent
L
Bertrand
Viviane
V
Lesur
Brigitte
B
Delfourne
Evelyne
E