<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 direct asymmetric aldol reactions of 1-phenylthiocycloalkyl carboxaldehydes with ketones.
[反应:见正文]据报道,用于合成碳-和杂环化合物的手性环丙基和环丁基衍生物的酸催化扩环反应。已经通过1-脯氨酸催化的1-苯基硫代环烷基羧醛与酮的直接不对称醛醇缩合反应成功地制备了起始原料。