A Simple Microscale Method for Determining the Relative Stereochemistry of Statine Units
作者:Alejandro Preciado、Philip G. Williams
DOI:10.1021/jo8012429
日期:2008.12.5
A simple method to determine the relative stereochemistry of statine amino acids (gamma-amino-beta-hydroxyacids) by using (1)H NMR spectroscopy is described. Configurational assignment of statine units within complex natural products is possible without degradation or derivatization as the syn and anti diastereomers can be distinguished by using a combination of chemical shift and coupling constant
描述了一种通过使用(1)H NMR光谱确定他汀类氨基酸(γ-氨基-β-羟基酸)的相对立体化学的简单方法。在复杂的天然产物中,他汀类单元的构型分配是可能的,而不会降解或衍生化,因为可以通过结合使用化学位移和衍生自α-亚甲基ABX系统的耦合常数信息来区分顺式和反非对映异构体。提供了七个示例,说明了该方法的范围和局限性。这些示例的复杂性范围很广,从简单的他汀类药物单元到环状二肽肽,如坦丹林B。