Synthesis of Tetrahydroquinolines through Intramolecular Carbolithiation Reactions
作者:Nuria Sotomayor、Oihane García-Calvo、Unai Martínez-Estíbalez、Esther Lete
DOI:10.3987/com-13-s(s)46
日期:——
Cyclization of aryllithiums obtained by iodine-lithium exchange reaction on N-alkenyl 2-iodoanilines allows the synthesis of 4- and 2,4-substituted tetrahydroquinolines. However, the alkene has to be substituted with a stabilizing group for the resulting organolithium to favor the intramolecular carbolithiation. When (-)-sparteine (4) or (+)-sparteine surrogate (5) are used as chiral ligands low levels of enantioselection are obtained. The carbolithiation is completely diastereoselective when an enantiomerically pure precursor is used.