Samarium Iodide-Mediated Reformatsky Reactions for the Stereoselective Preparation of β-Hydroxy-γ-amino Acids: Synthesis of Isostatine and Dolaisoleucine
作者:Christopher G. Nelson、Terrence R. Burke
DOI:10.1021/jo202091r
日期:2012.1.6
The synthesis of β-hydroxy-γ-amino acids via SmI2-mediated Reformatsky reactions of α-chloroacetyloxazolidinones with aminoaldehydes is reported. Diastereoselective coupling is demonstrated to depend on the absolute configuration of the Evans chiral auxiliary employed in the reaction, allowing erythro or threo products to be obtained selectively. The potential utility of the methodology is exemplified
报道了通过 SmI 2介导的 α-氯乙酰恶唑烷酮与氨基醛的Reformatsky 反应合成 β-羟基-γ-氨基酸。非对映选择性偶联被证明取决于反应中使用的 Evans 手性助剂的绝对构型,允许选择性地获得赤型或苏型产物。该方法的潜在效用体现在生物相关N -Boc -isostatine ( 2b ) 和N -Boc-dolaisoleucine ( 3c )的轻松合成。