Diastereoselective Anti Aldol Reactions of Chiral Ethyl Ketones. Enantioselective Processes for the Synthesis of Polypropionate Natural Products.
作者:David A. Evans、Howard P. Ng、J.Stephen Clark、Dale L. Rieger
DOI:10.1016/s0040-4020(01)88879-7
日期:1992.1
aldol reactions of the β-keto imide 3a, the related ethyl ketone 20b, and its diastereomer 22b have been studied. In these aldol reactions, the chiral ethyl ketones 3a and 20b were found to exhibit the opposite sense of asymmetric induction in the analogous anti aldol bond constructions from the derived (E) boron enolates. The relevance of this study to the synthesis of polypropionate natural products
研究了β-酮酰亚胺3a,相关的乙基酮20b及其非对映异构体22b的非对映选择性抗羟醛反应。在这些醛醇缩合反应中,发现手性乙基酮3a和20b在衍生自(E)硼烯醇化物的类似抗醛醇缩合键结构中表现出相反的不对称诱导感。讨论了这项研究与聚丙烯酸酯天然产物合成的相关性。