A One-Pot Asymmetric Sequential Amination-Alkylation of Aldehydes: Expedient Synthesis of Aliphatic Chiral Amines
作者:Vijay N. Wakchaure、Rashmi R. Mohanty、Ahson J. Shaikh、Thomas C. Nugent
DOI:10.1002/ejoc.200600781
日期:2007.2
asymmetric sequential amination-alkylation method has been developed for the synthesis of alkyl-alkyl′ α-chiral primary amines (aliphatic primary amines with a chiral center adjacent to the nitrogen atom) from aldehydes. In situ aldimine formation from non-branched, α-branched, and β-branched aliphatic aldehydes with (R)- or (S)-α-(methylbenzyl)amine [catalyzed by 5 mol-% Ti(OiPr)4] followed by reaction
已经开发了一种一锅不对称顺序胺化-烷基化方法,用于从醛合成烷基-烷基'α-手性伯胺(手性中心与氮原子相邻的脂肪族伯胺)。由非支化、α-支化和 β-支化脂肪醛与 (R)- 或 (S)-α-(甲基苄基)胺 [由 5 mol-% Ti(OiPr)4 催化] 原位形成醛亚胺在三氟化硼或烯丙基格氏试剂存在下与甲基、乙基或正丁基铜酸铜络合物反应为胺 2 或 5 提供了良好的产率 (77–88%) 和非对映体过量 (77–92%)。为了证明该方法的有效性,一些仲胺产物(2d、2e 和 5)被氢解,得到相应的对映体富集的烷基-烷基'α-手性伯胺 3d、3e 和 6(产率 86-96%) .