Catalytic Enantioselective Claisen Rearrangements of O‐Allyl β‐Ketoesters

A chiral guanidinium ion is shown to catalyze enantioselective Claisen rearrangements of O-allyl β-ketoesters in 78–87 % ee (see scheme). The pericyclic nature of the process allows products containing vicinal stereogenic centers to be accessed with both enantio- and diastereocontrol. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by 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.