research into new types of non-acylguanidine Na(+)/H(+) exchanger (NHE) inhibitors, we designed and synthesized aryl-fused tetrahydropyranylidene and cyclohexylidene aminoguanidine derivatives I (X = O, CH(2)), which were tested for their inhibitory effects on rat platelet NHEs. After optimization, we found that the S isomer of tetrahydroquinoline derivatives that possess a methyl group in the 4-position
Intramolekulare Aromatenalkylierungen, 15. Mitt. Synthese von 4-Methyl-5,6,7,8-tetrahydro-5-chinolinon
作者:Eberhard Reimann、Josef M. Friesinger
DOI:10.1002/ardp.19853181003
日期:——
Aus Methylvinylketon (1) und dem Enamin 3 entsteht abweichend von Literaturangaben das 2‐Methylchinolinon 4, nicht das im Titel genannte 4‐Methylisomer 5. Dieses wird erstmals aus dem Enamin 11 durch thermische Cyclisierung oder durch KMnO4‐Oxidation von 5,6,7,8‐Tetrahydrolepidin (7) synthetisiert. Die Vorstufe 11 ist aus Dihydroresorcin (17) und dem Butinylamin 15, das nach verbesserten Literaturvorschriften
Facile Synthesis of Pyridines from Propargyl Amines: Concise Total Synthesis of Suaveoline Alkaloids
作者:Zhiwen Zhao、Hongbo Wei、Ke Xiao、Bin Cheng、Hongbin Zhai、Yun Li
DOI:10.1002/anie.201811812
日期:2019.1.21
A general and efficient protocol was developed for the synthesis of polysubstituted pyridines from propargyl amines and unsaturated carbonyl compounds through a tandem condensation/alkyne isomerization/6π 3‐azatriene electrocyclization sequence. This process was found to be applicable to a wide range of readily available substrates (30 examples, up to 95 % yield) and could be readily performed on a
Quick Access to Pyridines through 6π-3-Azatriene Electrocyclization: Concise Total Synthesis of Suaveoline Alkaloids
作者:Hongbo Wei、Yun Li
DOI:10.1055/s-0037-1611811
日期:2019.9
different methodologies have been developed for the synthesis of these kinds of molecules. However, a sustainable and efficient procedure for the synthesis of pyridines is still highly desirable. In this Synpacts article, we highlight our recent approach to the construction of highly substituted pyridines though a tandem condensation/alkyne isomerization/6π-3-azatriene electrocyclization sequence.