<p><b>Abstract:</b>
High to moderate diastereoselectivity and high chemical yield are observed in
the Michael addition of ylide and chiral camphorpyrazolidinone ylide to an optically pure a,b-unsaturated carboxylic acid derivatives derived
from a chiral camphorpyrazolidinone and a,b-unsaturated carbonyl respectively. A novel
route to the asymmetric synthesis of cyclopropanation derivatives is described.</p>
Michael Addition of Thioacetic Acid to α, β-Unsaturated Carboxylic Acid Esters in the Presence of Clays or Zeolites
