Synthesis and preliminary evaluation of novel analogues of quindolines as potential stabilisers of telomeric G-quadruplex DNA
作者:Christine Le Sann、Jonathan Huddleston、John Mann
DOI:10.1016/j.tet.2007.10.045
日期:2007.12
quadruplex structures by appropriate small molecules. We describe the preparation of a new class of 2,7-disubstituted 10H-indolo[3,2-b]quinolines with enhanced selectivity for the stabilisation of quadruplex DNA compared to duplex DNA, and also the preparation of a key intermediate for the synthesis of trisubstituted quindolines.
端粒DNA是癌症治疗的潜在选择性靶标,因为与肿瘤相关的端粒酶调节大多数癌细胞中端粒的维持。端粒DNA的3'单链末端可以通过适当的小分子折叠成四链体结构。我们描述了一种新型的2,7-双取代的10 H-吲哚并[3,2- b ]喹啉类,与双链体DNA相比,其对四链DNA稳定的选择性增强,并且还制备了一种关键中间体。三取代喹啉的合成。
A novel cyclization to isoxazolo[3,4-e][2,1]benzisoxazole
作者:Alan R. Katritzky、Zuoquan Wang、C.Dennis Hall、Yu Ji、Novruz G. Akhmedov
DOI:10.1016/s0040-4039(02)00496-3
日期:2002.4
Methylation of 2,1-benzisoxazole 4,5-dione 4-oxime 2 using dimethyl sulfate in DMF and in the presence of potassium carbonate gave a substantial yield of isoxazolo[3,4-e][2,1]benzisoxazole 4 by an unexpected cyclization reaction of the O-methylation product 3. (C) 2002 Elsevier Science Ltd. All rights reserved.
Toward new camptothecins. Part 6: Synthesis of crucial ketones and their use in Friedländer reaction
In the context of the preparation of camptothecin and luotonin A analogs, the synthesis of some key keto-precursors and their use in Friedländer condensation are described. This paper also focuses on the stability of these keto intermediates and emphasizes the major differences between indolizinones and pyrroloquinazolinones series. Noteworthy is also the report of some original structures isolated
A general and efficient approach to 2H-indazoles and 1H-pyrazoles through copper-catalyzed intramolecular N–N bond formation under mild conditions
作者:Jiantao Hu、Yongfeng Cheng、Yiqing Yang、Yu Rao
DOI:10.1039/c1cc13908h
日期:——
A new efficient copper-catalyzed intramolecular amination reaction has been developed to readily synthesise a wide variety of multi-substituted 2H-indazole and 1H-pyrazole derivatives from easily accessible starting materials under mild conditions. A highly selective ligand for estrogen receptor β was prepared in three steps by employing this method.