An oxidative hetero coupling reaction between 2-oxindoles and phenols was developed using a guanidinium/hypoiodite catalytic system. This reaction enables the efficient construction of 3-aryl-2-oxindole scaffolds under mild conditions. Furthermore, oxidative heterocoupling employing a chiral guanidinium organocatalyst in combination with hypoiodite afforded enantio-enriched products with moderate enantioselectivity.
Ishizuka et al. (Wed,) studied this question.