SCHEDULED MAINTENANCE
Chiral crowns complexed to potassium bases catalyse with high turnover numbers the Michael additions of a β-ketoester to methyl vinyl ketone, and of two phenylacetic esters to methyl acrylate, to give products of 99–60% optical purity with a configurational bias rationalizable on the basis of steric effects.
D. J. Cram and G. D. Y. Sogah, J. Chem. Soc., Chem. Commun., 1981, 625 DOI: 10.1039/C39810000625
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