Proline-catalyzed asymmetric aldol reactions of tetrahydro-4H-thiopyran-4-one with aldehydes
作者:Dale E. Ward、Vishal Jheengut
DOI:10.1016/j.tetlet.2004.09.061
日期:2004.11
Proline-catalyzed enantioselective direct intermolecular aldol reactions of tetrahydro-4H-thiopyran-4-one with various aldehydes give anti adducts with high diastereo- and enantioselectivities in moderate to excellent yields. With the aromatic aldehydes best results were obtained in wet DMF whereas dry DMSO generally was superior with the aliphatic aldehydes. Desulfurization of the adducts with Raney
四氢-4 H-硫代吡喃-4-酮与各种醛的脯氨酸催化的对映选择性直接分子间羟醛缩合反应以中等至极好的收率得到具有高非对映体和对映体选择性的抗加合物。使用芳族醛,在湿DMF中可获得最佳结果,而干DMSO通常优于脂族醛。用阮内镍对加合物进行脱硫可提供与3-戊酮醛醇缩醛相当的产物,并可能在聚丙烯酸酯合成中得到应用。