Methods for making bis-heterocyclic compounds, especially bis-heterocyclic compounds having five and six-membered heterocyclic linkers are described. Also described are methods for making an alpha amino ketone synthon that enables facile syntheses of bisindole compounds, including topsentins and dragmacidins.
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The potential of achiral sponge-derived and synthetic bromoindoles as selective cytotoxins against PANC-1 tumor cells
作者:Nicholas Lorig-Roach、Frances Hamkins-Indik、Tyler A. Johnson、Karen Tenney、Frederick A. Valeriote、Phillip Crews
DOI:10.1016/j.tet.2017.11.029
日期:2018.1
indoles, the known 6-bromo conicamin (1) and the new derivative, 6-Br-8-keto-conicamin A (2), were identified and 2 (IC50 1.5 μM for the naturalproduct vs 4.1 μM for the synthetic material) was determined to be responsible for the cytotoxic activity of the extract against the PANC-1 tumor cell line. The newnaturalproduct and ten additional analogs were prepared for further SAR testing.
我们对具有体外实体瘤选择性的天然产物的分离和表征的追求是通过访问印度太平洋海绵提取物存储库来推动的。在该项目中,通过体外纸片扩散测定 (DDA) 和 IC 50测定,从美国 NCI 天然产物存储库获得的一种单链海绵的提取物显示,对人胰腺癌细胞系 (PANC- 1)相对于人淋巴细胞白血病细胞系(CCRF-CEM)。鉴定出两种溴化吲哚,即已知的 6-溴锥虫胺 ( 1 ) 和新衍生物 6-Br-8-酮-锥虫胺 A ( 2 ),2(天然产物的 IC 50为 1.5 μM,天然产物的 IC 50 为 4.1 μM)合成材料)被确定为提取物针对 PANC-1 肿瘤细胞系的细胞毒活性的原因。新的天然产品和十种其他类似物已准备好进行进一步的 SAR 测试。
A Facile Synthesis of Dragmacidin B and 2,5-Bis(6‘-bromo-3‘-indolyl)piperazine
作者:Fumiko Y. Miyake、Kenichi Yakushijin、David A. Horne
DOI:10.1021/ol0001970
日期:2000.10.1
A short synthesis of dragmacidin B (1), 2,5-bis(6'-bromo-3'-indolyl)piperazine (2), and corresponding didebromo analogues 8 and 9 is described. The key steps involve the dimerization of oxotryptamines 4 and 11 to give bis(indolyl)pyrazines 5 and 12, which upon selective reduction and reductive methylation with sodium cyanoborohydride afforded the requisite piperazine natural products.
A concise synthesis of indolic enamides coscinamide A, coscinamide B, and the brominated tryptamine derivative igzamide is described. Both E- and Z-isomers of these natural compounds were obtained during the thermally assisted dehydration reaction and were tested for antitumor activity. Coscinamide B was found to possess antitumor activity against DU145 with an IC50 of 7.6 mu g/mL. (C) 2009 Elsevier Ltd. All rights reserved.