Metallation of pyridines and quinolines in the presence of a remote carboxylate group. New syntheses of heterocyclic quinones
作者:Anne-Sophie Rebstock、Florence Mongin、François Trécourt、Guy Quéguiner
DOI:10.1039/b312723k
日期:——
2-(3- and 2-Pyridylcarbonyl)benzoic acids (2, 3), 2-(2-pyridylcarbonyl)thiophene-3-carboxylic acid (6), 2-(3-quinolylcarbonyl)benzoic acid (10), and most of the corresponding esters (compounds 1, 7 and 9) are readily synthesized and involved in a deprotonation–condensation sequence. Biologically active aza-anthraquinones such as benzo[g]isoquinoline-5,10-dione (2-azaanthraquinone, 4) and benzo[g]quinoline-5,10-dione (1-azaanthraquinone, 5) are prepared using the strategy. Extension to other heterocyclic quinones such as thieno[3,2-g]quinoline-4,9-dione (8) and benzo[j]phenanthridine-7,12-dione (11) is also investigated.
2-(3-和2-吡啶羧基)苯甲酸(2,3)、2-(2-吡啶羧基)噻吩-3-羧酸(6)、2-(3-喹啉羧基)苯甲酸(10)及大多数对应的酯(化合物1、7和9)可以方便地合成,并涉及去质子化-缩合的反应序列。生物活性的氮杂蒽醌如苯并[g]异喹啉-5,10-二酮(2-氮杂蒽醌,4)和苯并[g]喹啉-5,10-二酮(1-氮杂蒽醌,5)也是采用该策略制备的。此外,还研究了扩展至其他杂环醌的可能性,如噻吩[3,2-g]喹啉-4,9-二酮(8)和苯并[j]苯anthridine-7,12-二酮(11)。