Published in
Royal Society of Chemistry, Organic and Biomolecular Chemistry, 3(7), p. 483-487
DOI: 10.1039/b817283h
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What is the mechanism of amine conjugate additions to pyrazole crotonate catalyzed by thiourea catalysts?
Journal article published in 2009 by
Luis Simón,
Jonathan M. Goodman 
This paper was not found in any repository, but could be made available legally by the author.
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Abstract
Aminoindanol-derived thioureas catalyze proton transfer and do not stabilise anions in an asymmetric conjugate addition to pyrazole crotonate. Calculations show that the urea H-bonds play different roles in the preferred transition state and in the one leading to the minor enantiomer in the mechanism of hydroxy-thiourea catalyzed conjugate additions to pyrazole crotonates.