(1
S,2
R)-1-Aminoindan-2-ol-derived thioureas behave as efficient H-bonding organocatalysts for the nucleophilic conjugate addition of formaldehydehydrazones to
,![](/images/gifchars/gamma.gif)
-unsaturated
![](/images/gifchars/alpha.gif)
-keto esters as enoate surrogates, affording the corresponding adducts in good yields and enantioselectivities.