A Chiral Bis(betaine) Catalyst for the Mannich Reaction of Azlactones and Aliphatic Imines

By design: New chiral bis(betaine)s, for example 1, containing two catalytically active centers have been designed. They have proven to be promising organocatalysts for the direct Mannich-type reaction of azlactones with a broad spectrum of aliphatic imines, thus affording α-tetrasubstituted α,β-diamino acid surrogates with excellent enantioselectivities. 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.