Organocatalytic asymmetric synthesis of 3-chlorooxindoles bearing adjacent quaternary–tertiary centersNoole, Artur; Järving, Ivar; Werner, Franz; Lopp, Margus; Malkov, Andrei; Kanger, TõnisOrganic letters2012 / p. 4922-4925 : ill https://pubs.acs.org/doi/10.1021/ol302245b