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 leukemia), MCF-7 (breast adenocarcinoma, estrogen receptor-positive), MDA-MB-231 (breast adenocarcinoma, estrogen receptor-negative), HeLa (cervical adenocarcinoma), CCRF-CEM cell line (T-cell acute lymphoblastic leukemia) and A-549 cell line (lung adenocarcinoma), and their activity compared with natural phytoalexins and corresponding (1H-indol-3-yl)acetic acid derivatives. The highest potency with IC50 3.3–66.1 μmol l–1 was found for glyoxyl analogs of 1-methoxybrassenin B.
使用(1H-吲哚-3-基)-、(1-甲氧基吲哚-3-基)和[1-(2,3,4,6-四O-乙酰-β-D-葡萄糖吡喃基)吲哚-3-基]乙醛氯化物作为起始化合物,制备了吲哚植物抗生素brassinin、1-甲氧基brassinin、brassitin、1-甲氧基brassitin和1-甲氧基brassenin B的乙醛类似物。合成产物对人类癌细胞系Jurkat(T细胞急性淋巴细胞白血病)、MCF-7(乳腺腺癌,雌激素受体阳性)、MDA-MB-231(乳腺腺癌,雌激素受体阴性)、HeLa(子宫颈腺癌)、CCRF-CEM细胞系(T细胞急性淋巴细胞白血病)和A-549细胞系(肺腺癌)的抗增殖活性进行了检测,并将其活性与天然植物抗生素及相应的(1H-吲哚-3-基)乙酸衍生物进行了比较。发现1-甲氧基brassenin B的乙醛类似物具有最高的活性,IC50为3.3-66.1μmol l-1。