Polarity-Mismatched Addition of Electrophilic Carbon Radicals to an Electron-Deficient Acceptor: Cascade Radical Addition–Cyclization–Trapping Reaction
in the case of substrates 2–7, perfluoroalkyl radicals selectively added to an electron-deficient alkene moiety of 2–7, to give polarity-mismatched perfluoroalkylation products without the formation of regioisomers. Next, the control of enantioselectivity was studied. In the case of substrates 1 and 3, the reaction proceeded with good enantioselectivities by employing a chiral Lewis acid, prepared from
Lewis acid-mediated radical cyclization: stereocontrol in cascade radical addition–cyclization–trapping reactions
作者:Hideto Miyabe、Ryuta Asada、Yoshiji Takemoto
DOI:10.1039/c2ob25073j
日期:——
An efficient approach for achieving radical cyclizations by using hydroxamate ester as a coordination tether with Lewis acid was studied. The chiral Lewis acid-mediated cascaderadicaladdition–cyclization–trappingreaction proceeded smoothly with good enantio- and diastereoselectivities, providing various chiral γ-lactams.