Regioselective Alkylation of Heteroaromatic Compounds with 3-Methyl-2-Quinonyl Boronic Acids
作者:Marcos Veguillas、María Ribagorda、M. Carmen Carreño
DOI:10.1021/ol1028964
日期:2011.2.18
heteroaromatic compounds with 3-methyl substituted 2-quinonyl boronic acids proceeded by 1,4-addition followed by spontaneous protodeboronation, leading directly to the Friedel−Crafts alkylation products instead of the commonly observed alkenylation derivatives resulting from quinones. The boronic acid acts as a temporary regiocontroller, making the system a highly reactive quinone equivalent and opening a
A Two-Step Synthesis of a Novel 7,8-Dihydro-5,8-ethanoindolizine-6,9(5H)-dione
作者:Luis Chacón-García、Salvador Gallardo-Alfonzo、Carlos Jesus Cortés-Garcia、Itzel Mejía-Farfán、Yliana López、Martha Mojica、Claudia Contreras-Celedón
DOI:10.1055/s-0040-1707182
日期:2021.1
A two-stepsynthesis of the novel 5,8-dimethyl-7,8-dihydro-5,8-ethanoindolizine-6,9(5H)-dione from 2,3-dimethyl-1,4-benzoquinone is described. The key step of the synthesis of this unusual fused tricyclic system is the intramolecular regiospecific aza-Michael addition of a pyrrole to an activated double bond by reaction with tetrabutylammonium fluoride under mechanochemical conditions.