Yoshitomi Yayoi, Makino Kazuishi, Hamada Yasumasa
Graduate School of Pharmaceutical Sciences, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan.
Org Lett. 2007 Jun 21;9(13):2457-60. doi: 10.1021/ol0706004. Epub 2007 May 23.
An efficient synthesis of (2S,3R)-3-hydroxy-3-methylproline (OHMePro), a component of polyoxypeptins, and relatives was achieved, in which an intramolecular asymmetric aldol reaction of the ketoaldehyde using OHMePro itself as an organocatalyst constitutes a key step.