Investigations into the enantioselective C-protonation of prostereogenic enolate(s) derived from N,N′-diisopropyl-2-phenylpropanamide using suicide C-based proton sources
作者:Gregory S. Coumbarides、Jason Eames、Stephanos Ghilagaber、Michael J. Suggate
DOI:10.1016/j.tetlet.2004.10.090
日期:2004.12
corresponding racemic amide by addition of sec-BuLi (to give the corresponding achiral lithium enolate) and subsequent desymmetrisation by the addition of a chiral C-based proton source. We discuss potential factors that may be responsible for this observed enantioselectivity and comment on the role of the chiral acid.
通过添加sec -BuLi对称化相应的外消旋酰胺,可以合成对映体富集的(-)-(R)-N,N'-二异丙基-2-苯基丙酰胺,对映体过量最高可达69%。非手性烯醇化锂)和随后通过添加手性C基质子源进行的不对称化。我们讨论了可能导致这种对映体选择性的潜在因素,并评论了手性酸的作用。