Enantioselective N‐Heterocyclic Carbene Catalyzed Aza‐Benzoin Reaction of Enals with Activated Ketimines

α-Amino ketones, which are versatile building blocks for organic synthesis, were obtained with the title reaction. A free hydroxy group on the NHC catalyst was found to be crucial for the reaction, and the possible competing reaction through a homoenolate or enolate was not observed with this catalyst (see scheme). As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.