Abstract Glyoxyl analogs of indole phytoalexins brassinin, 1-methoxybrassinin, brassitin, 1- methoxybrassitin and 1-methoxybrassenin B were prepared, using (1H-indol-3-yl)-,(1- methoxyindol-3-yl)-and [1-(2, 3, 4, 6-tetra-O-acetyl-β-D-glucopyranosyl) indol-3-yl] glyoxyl chlorides as starting compounds. Synthesized products were examined for their antiproliferative activity against human cancer cell lines Jurkat (T-cell acute lymphoblastic ...