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Complexes of the natural melophlins A and C with Mg, Zn, Ga, La and Ru were prepared, characterized and tested for antimicrobial and cytotoxic effects. The lanthanum complex La(melophlinato C) 3 and the ruthenium complex chlorido(η 6 -p-cymene)(melophlinato C)ruthenium(II) inhibited cells of human A-498 kidney cancer at IC 50 =0.54μM and 1.0μM, respectively, and so distinctly...
The naturally occurring 3-acyltetramic acids (3-acylpyrrolidine-2,4-diones) melophlin A, B, C and G were prepared in few steps from α-aminoesters or their hydrochlorides by cyclization with Ph 3 PCCO under mild conditions. The employment of immobilized, polystyrene-bound ylide greatly simplifies the removal of by-product Ph 3 PO and of other impurities. Various 3-acylation methods...
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