<scp>l</scp>-Proline-Catalyzed Direct Intermolecular Asymmetric Aldol Reactions of 1-Phenylthiocycloalkyl Carboxaldehydes with Ketones. Easy Access to Spiro- and Fused-Cyclobutyl Tetrahydrofurans and Cyclopentanones
作者:Angela M. Bernard、Angelo Frongia、Regis Guillot、Pier P. Piras、Francesco Secci、Marco Spiga
DOI:10.1021/ol063084a
日期:2007.2.1
[reaction: see text] Acid-catalyzed ring expansion of chiral cyclopropyl and cyclobutyl derivatives for the synthesis of carbo- and heterocyclic compounds is reported. The starting materials have been successfully prepared by l-proline-catalyzed directasymmetricaldolreactions of 1-phenylthiocycloalkyl carboxaldehydes with ketones.