Nanomole-Scale Assignment of Configuration for Primary Amines Using a Kinetic Resolution Strategy
作者:Shawn M. Miller、Renzo A. Samame、Scott D. Rychnovsky
DOI:10.1021/ja310620c
日期:2012.12.19
The absolute configurations of primary amines were assigned using a kinetic resolution strategy with Mioskowski's enantioselective 1-(R,R) and 2-(S,S) acylating agents. A simple mnemonic was developed to determine the configuration. A pseudoenantiomeric pair of reagents, 1-(R,R) and 2-(S,S)-d(3), was prepared and used to assay primary amines on a micromolar scale. The ESI-MS readout of the resulting
A non-enzymatic acetyl transfer-based kinetic resolution of primary allylic amines is reported. The process involves the use of (1S,2S)-1 in conjunction with a supported ammonium salt and affords the corresponding enantio-enriched N-acetylated allylic amines with unprecedented levels of selectivity (s-factors up to 34).
Ionic liquids are remarkably suitable and clean media for performing nonenzymatic kinetic resolution (KR) of amines through enantioselective N-acetylation: high levels of selectivity were obtained with a large variety of amines at room temperature (up to s = 30).
The non-enzymatic kinetic resolution of diversely substituted primary propargylic amines is reported featuring a highly selective acetyl transfer using (1S,2S)-1 in conjunction with AliquatTM 336, affording the corresponding enantio-enriched N-acetylated propargylic amines with unprecedented levels of selectivity (s-factors of up to 193 at 50% conversion).
Kinetic Resolution of Amines: A Highly Enantioselective and Chemoselective Acetylating Agent with a Unique Solvent-Induced Reversal of Stereoselectivity