used to catalyze the addition of indoles and other π nucleophiles to N‐alkylated and unprotected isatins (see picture). The resulting biologically relevant substituted 3‐hydroxy‐2‐oxindoles were obtained in high yield with high enantioselectivity. Tf=trifluoromethanesulfonyl.
                                    不再遇到双重麻烦:当使用手性scan(III)和
铟(III)络合物催化
吲哚和其他π亲核试剂向N烷基化和未保护的
靛红加成时,竞争性双重加成途径得到抑制(见图)。得到的具有
生物意义的取代的3-羟基-2-氧
吲哚以高收率和高对映选择性获得。Tf =三
氟甲磺酰基。