Remote Stereoinduction in the Acylation of Fully Substituted Enolates: Tandem Reformatsky/Quaternary Claisen Condensations of Silyl Glyoxylates and β-Lactones
作者:Stephen N. Greszler、Justin T. Malinowski、Jeffrey S. Johnson
DOI:10.1021/ja108848d
日期:2010.12.15
glyoxylates and β-lactones to give highly functionalized Claisen condensation products. A heretofore undocumented instance of stereochemical 1,4-induction results in efficient transmission of β-lactone stereochemistry to the emerging fully substituted stereocenter. Second-stage transformations reveal that the five heteroatom-containing functionalities embedded within the products are entirely chemo-differentiated
Reformatsky 试剂依次与乙醛酸甲硅烷基酯和 β-内酯反应,得到高度官能化的克莱森缩合产物。迄今为止未记录的立体化学 1,4-诱导实例导致 β-内酯立体化学有效传输到新兴的完全取代的立体中心。第二阶段的转化表明,嵌入产品中的五个含杂原子的功能是完全化学分化的,这种情况允许快速组装 leustroducsin B 核心亚结构。