RESUMO
The n-Bu3P organocatalyzed reaction of cycloalkanones, i.e., cyclopentanones or 1,3-cyclopentanediones tethered to actived olefins, afforded selectively and in high yields three different types of products: bicyclo[3.2.1]octanones, mixed acetals, and Morita-Baylis-Hillman products. The progress of the reaction was closely related to the reaction medium and to the length of the tether located between the cyclopentanone (-dione) and the activated olefin.
Assuntos
Acetais/síntese química , Alcenos/química , Compostos Bicíclicos com Pontes/síntese química , Fosfinas/química , Acetais/química , Compostos Bicíclicos com Pontes/química , Catálise , Estrutura Molecular , Solventes/químicaRESUMO
The addition of 0.5 equiv of TiCl(4) to (cyclo)alkanones tethered to α,ß-unsaturated ketones afforded polyfunctionalized diquinanes, hydrindanes, and decalines. These products, resulting from a Michael-aldol or a Baylis-Hillman reaction, can be obtained with high or total diastereoselectivity in moderate to high yields. These scaffolds represent interesting building blocks for the synthesis of complex natural products.
Assuntos
Indanos/química , Lactatos/química , Naftalenos/química , Titânio/química , Produtos Biológicos/química , Cetonas/química , Estrutura Molecular , EstereoisomerismoRESUMO
The biological evaluation of some novel thiazoloindolo[3,2-c]quinoline, 8-substituted-11H-indolo[3,2-c]quinolines is described. These compounds were obtained via Graebe-Ullmann thermal cyclization from appropriated N-arylated benzotriazoles. 7H-4,7-Diaza-benzo[de]anthracene, a reaction by-product structurally closed to the pyridoacridine skeleton was also identified. All thiazolobenzotriazole intermediates were tested in vitro for their capacity to inhibit the growth of two breast cancer cell lines, MCF-7 and MDA-MB-231. In parallel, the newly synthesized skeletons were evaluated for DNA interaction, topoisomerases' inhibition, and cytotoxicity against HL60 and HL60/MX2 human leukemia cells. Most compounds showed a potent growth inhibitory effect on all the tested cell lines, with IC(50) in the muM range.