useful tetrahydroquinolines has been developed through the asymmetricorganocatalytic conjugate addition–cyclization reaction of malonates with o-N-protected aminophenyl α,β-unsaturated aldehydes using a diphenylprolinol TMS ether as an organocatalyst followed by reductive deoxygenation. This novel protocol allows for the formation of 4-substituted chiral tetrahydroquinolines, which are not easily accessible
Asymmetric Organocatalyzed Reaction Sequence To Synthesize Chiral Bridged and Spiro-Bridged Benzofused Aminals via Divergent Pathways
作者:Ying-Han Chen、Xue-Jiao Lv、Zhi-Hao You、Yan-Kai Liu
DOI:10.1021/acs.orglett.9b01874
日期:2019.7.19
asymmetric organocatalysis-triggered reaction sequence is developed. 2-Hydroxy cinnamaldehydes and cyclic N-sulfonyl ketimines were both used as multisite substrates (more than two reactive sites) to accessstructurallydiverse chiral bridged and spiro-bridged benzofused aminal derivatives, where an inseparable equilibrating mixture of isomers can be regioselectively converted into bridged benzofused
Construction of chiral cyclopropane-fused tetrahydroquinolines: enantioselective organocatalytic Michael/alkylation domino reaction and one-pot aza-cyclization
作者:Cheolwoong Kim、Sung-Gon Kim
DOI:10.1016/j.tetasy.2014.09.003
日期:2014.10
An asymmetric two-step approach toward the synthesis of chiral cyclopropane-fused tetrahydroquinolines is described. In this synthesis, an asymmetricorganocatalytic Michael/alkylation domino reaction of dialkyl bromomalonates with o-N-protected aminophenyl α,β-unsaturated aldehydes allows the process to proceed efficiently to afford the corresponding 2-formylcyclopropane products in good yields and