Synthesis of Cytotoxic Quino[4,3-<i>b</i>]carbazole Frameworks through an Intramolecular Diels–Alder Reaction
作者:Vinayagam Pavunkumar、Kesavan Harikrishnan、Arasambattu K. Mohanakrishnan
DOI:10.1021/acs.joc.3c01909
日期:2024.1.5
successfully exploited for the synthesis of quino[4,3-b]carbazole and its analogues. This reaction proceeds through a [4 + 2] cycloaddition followed by elimination and deprotection of phenylsulfonyl units to afford the quinocarbazoles in moderate to good yields. The reaction features a broad substrate scope and remarkable functional group forbearance. A preliminary in vitro cytotoxicity evaluation of representative
位置异构吲哚-2/3-苯基乙烯基-N-炔基化( N-苯磺酰基)胺的分子内狄尔斯-阿尔德反应已成功用于合成喹诺[4,3- b ]咔唑及其类似物。该反应通过[4+2]环加成进行,然后消除苯磺酰基单元并脱保护,以中等至良好的产率提供喹啉咔唑。该反应具有广泛的底物范围和显着的官能团耐受性。针对 NCI-H460 人类癌细胞培养物,对代表性喹啉[4,3- b ]咔唑进行了初步的体外细胞毒性评估。在评估的喹啉[4,3- b ]咔唑中,五种含氟喹啉咔唑显示出纳米摩尔范围(0.8–2.0 nm)GI 50值。还对代表性喹咔唑进行了紫外可见光谱和荧光光谱研究。与玫瑰树碱一样,四种喹咔唑显示出双重发射,证实了极性质子溶剂中存在对醌类互变异构形式。