A New and Direct Asymmetric Synthesis of a Hindered Chiral Amine via a Novel Sulfinate Ketimine Derived from <i>N</i>-Tosyl-1,2,3-oxathiazolidine-2-oxide: Practical Asymmetric Synthesis of (<i>R</i>)-Sibutramine
作者:Zhengxu Han、Dhileepkumar Krishnamurthy、Chris H. Senanayake
DOI:10.1021/op050182n
日期:2006.3.1
A novel and direct approach for the asymmetric synthesis of (R)-sibutramine via chiral amine 5 using N-tosyl-1,2,3-oxathiazolidine-2-oxide (13) as a recyclable chiral auxiliary is described. Chiral sulfinate imine 16e was obtained by treatment of 13e with the imine intermediate formed from the reaction of a nitrile 1 and iBuMgCl that, upon reduction, provides an optically active amine 5 with high enantiopurity
描述了一种新颖且直接的方法,其使用N-甲苯磺酰基-1,2,3-氧代噻唑烷-2-氧化物(13)作为可循环的手性助剂,通过手性胺5不对称合成(R)-西布曲明。手性亚磺酸亚胺16e是通过用腈1和i的反应形成的亚胺中间体处理13e而获得的还原后可提供具有高对映体纯度的旋光胺5的BuMgCl。