Hajos-Parrish

The amino acid catalyzed intramolecular aldol reaction of prochiral 2-alkyl-2-(3-oxoalkyl)-cyclopentane-1,3-diones.

An Unconventional Approach to the Enantioselective Synthesis of Caryophylloids
Oleg V. Larionov and E. J. Corey
J. Am. Chem. Soc., 2008, 130 (10), pp 2954–2955
DOI: 10.1021/ja8003705

A Short Enantioselective Total Synthesis of the Third-Generation Oral Contraceptive Desogestrel
E. J. Corey and Alan X. Huang
J. Am. Chem. Soc., 1999, 121 (4), pp 710–714
DOI: 10.1021/ja983179a