Diastereo- and Enantioselective Construction of Dihydroisocoumarin-Based Spirooxindole Frameworks <i>via</i>
Organocatalytic Tandem Reactions
作者:Jia-Le Wu、Bai-Xiang Du、Yu-Chen Zhang、Ying-Ying He、Jing-Yi Wang、Ping Wu、Feng Shi
DOI:10.1002/adsc.201600271
日期:2016.9.1
An organocatalyticasymmetric approach has been developed for the ennantioselective construction of dihydroisocoumarin‐based spirooxindole frameworks in high yields, excellent diastereo‐ and enantioselectivities (up to 99%, all >95:5 dr, up to 99% ee). This approach takes advantage of chiral thiourea‐tertiaryamine catalyzed tandemreaction of isatins with enolizable homophthalic anhydride, which has
Synthesis of 5H-Pyrazino[2,3-b]indoles from Indole-2,3-dione Derivatives.
作者:Jan Bergman、Hans Vallberg、Per-Ola Norrby、Björn Åkermark、Ward T. Robinson、Bryan R. Wood、Ward T. Robinson、Björn O. Roos、Claire Vallance、Bryan R. Wood
DOI:10.3891/acta.chem.scand.51-0742
日期:——
Reaction of N-acetylindol-2,3-diones with ethylenediamines gave the dihydro-pyrazinones 11, which could, after dehydrogenation and deacetylation be transformed to the corresponding 5H-pyrazino[2,3-b]indoles 5. N,N-Dimethylaminoethylation of the anion of 5 occurred selectively in the 5-position. Thermolysis of 1-pyrazinylbenzotriazole gave pyrazino[1,2-a]-benzimidazole 33 and no 5H-pyrazino[2,3-b] indole.
Diverse synthesis of pyrano[2,3-b]indol and dihydropyrano[2,3-b]indol via tunable Lewis bases catalyzed domino reactions
We first reported an example of diverse synthesis of pyrano[2,3-b]indol and dihydropyrano[2,3-b]indol from the same starting materials. In these domino reactions, we can control the reaction conditions to give three new products: pyrano[2,3-b]indol, dihydropyrano[2,3-b]indol with E or Z exocyclic double bond. Using DABCO as catalyst in THF, dihydropyrano[2,3-b]indol with E exocyclic double bond and pyrano[2,3-b]indol were obtained at room temperature and 65 degrees C, respectively. In contrast, when DMAP was selected as catalyst, dihydropyrano[2,3-b]indol with Z exocyclic double bond was formed in toluene at 80 degrees C. (C) 2015 Elsevier Ltd. All rights reserved.
New hydrazides derivatives of isoniazid against Mycobacterium tuberculosis: Higher potency and lower hepatocytotoxicity
作者:Frederico Silva Castelo-Branco、Evanoel Crizanto de Lima、Jorge Luiz de Oliveira Domingos、Angelo C. Pinto、Maria Cristina S. Lourenço、Karen Machado Gomes、Mariana Marques Costa-Lima、Carlos Fernando Araujo-Lima、Claudia Alessandra Fortes Aiub、Israel Felzenszwalb、Thadeu Estevam M.M. Costa、Carmen Penido、Maria G. Henriques、Nubia Boechat
DOI:10.1016/j.ejmech.2018.01.071
日期:2018.2
Tuberculosis (TB) is one of the leading causes of death worldwide. The emergence of multi-drug resistant strains of Mycobacterium tuberculosis (Mtb) and TB-HIV co-infection are major public health challenges. The anti-TB drugs of first choice were developed more than 4 decades ago and present several adverse effects, making the treatment of TB even more complicated and the development of new chemotherapeutics for this disease imperative. In this work, we synthesized two series of new acylhydrazides and evaluated their activity against different strains of Mtb. Derivatives of isoniazid (INH) showed important anti-Mtb activity, some being more potent than all anti-TB drugs of first choice. Moreover, three compounds proved to be more potent than INH against resistant Mtb. The Ames test showed favorable results for two of these substances compared to INH, one of which presented expressly lower toxicity to HepG2 cells than that of INH. This result shows that this compound has the potential to overcome one of the main adverse effects of this drug. (C) 2018 Elsevier Masson SAS. All rights reserved.