Merging Asymmetric [1,2]-Additions of Lithium Acetylides to Carbonyls with Type II Anion Relay Chemistry
作者:Kevin T. O’Brien、Amos B. Smith
DOI:10.1021/acs.orglett.9b02959
日期:2019.9.20
union of a variety of lithium acetylides and electrophiles exploiting an achiral linchpin via an anionic reaction cascade. This Type II Anion Relay Chemistry tactic is initiated via an enantioselective [1,2]-carbonyl addition exploiting BINOL catalysis to access an enantioenriched alkoxide intermediate. Migration of charge across the linchpin via a [1,4]-Brook rearrangement with electrophile capture
已开发出对映选择性的三组分偶联反应,通过阴离子反应级联,利用非手性链节销,使各种乙酰化锂和亲电试剂的结合成为可能。通过使用BINOL催化的对映选择性[1,2]-羰基加成反应,可启动II型阴离子中继化学策略,从而获得对映体富集的醇盐中间体。通过具有亲电试剂捕获的[1,4] -Brook重排,跨过针孔的电荷迁移,得到了三组分炔丙基醚加合物。在此,我们报告了该反应序列的发展,范围和局限性。