Reversal of regioselectivity in the catalytic asymmetric conjugateadditions of 3-substituted oxindoles to β-nitroenones or β-nitroacrylates was established with chiral scandium catalysts. It enabled the construction of functionalized 3,3-disubstituted oxindoles, including terminal and internal vinyl groups in excellent yields and ee values.
the enantioselective synthesis of complex tricyclo[3.2.2.0]nonenes through the Diels–Alder reaction is reported. Utilizing racemic norcaradienes prepared from the visible-light-mediated dearomative cyclopropanation of m-xylene as dienes and enone derivatives as dienophiles, the overall process represents a kinetic asymmetric transformation in the presence of a chiral cobalt(II) complex of chiral N,N′-dioxide