Synthesis and properties of bioactive 2- and 3-amino-8-methyl-8H-quino[4,3,2-kl]acridine and 8,13-dimethyl-8H-quino[4,3,2-kl]acridinium saltsPart 15 in the series: Antitumour polycyclic acridines. See ref. 1. for part 14.
作者:Ian Hutchinson、Andrew J. McCarroll、Robert A. Heald、Malcolm F. G. Stevens
DOI:10.1039/b310796p
日期:——
Cyclisation of 9-(benzotriazol-1-yl)acridine 1 to the pentacycle 8H-quino[4,3,2-kl]acridine 5 in a range of low-boiling solvents is mechanistically distinct from previously published photochemical (carbene) and thermolytic (radical) cyclisations. Fragmentation of the triazole ring of 1 to a diazonium intermediate 7, and its subsequent heterolysis (–N2) and cyclisation is facilitated by solvation of intermediate zwitterionic species. Derivatives of 2- and 3-aminoquinoacridines methylated in the 8-position can be converted to 8,13-dimethylquino[4,3,2-kl]acridinium iodide salts with methyl iodide and were required for biological examination as potential telomerase inhibitors. The chloro group in 3-chloro-8-methyl-8H-quino[4,3,2-kl]acridine can be replaced efficiently by benzylamino, 4-morpholinyl and cyano substituents in palladium(0) mediated reactions.
9-(1,2,3-苯并三氮唑-1-基)吖啶1在低沸点溶剂中环化生成五元环8H-喹喔啉[4,3,2-kl]吖啶5的机理与先前报道的光化学(碳烯)和热解(自由基)环化反应不同。1的苯并三氮唑环断裂生成中间体重氮盐7,随后发生异裂脱氮(-N2)和环化,这一过程得益于中间体两性离子的溶剂化作用。2-和3-氨基喹喔吖啶的甲基化衍生物在8-位甲基化后,可以通过甲基碘转化为8,13-二甲基喹喔啉[4,3,2-kl]吖啶碘盐,这些产物作为潜在的端粒酶抑制剂,需进行生物学检测。3-氯-8-甲基-8H-喹喔啉[4,3,2-kl]吖啶中的氯基可以高效地被苯甲氨基、4-吗啉基和氰基取代,这些反应都是通过钯(0)催化的反应完成的。