Structure and absolute configuration of new acidic metabolites from Stachys ehrenbergii
作者:Raffaella Cincinelli、Leonardo Scaglioni、Nelly A. Arnold、Sabrina Dallavalle
DOI:10.1016/j.tetlet.2011.08.143
日期:2011.11
Two novel metabolites have been isolated from the aerial parts of Stachys ehrenberiigii. Their structures and stereochemistry were elucidated using a combination of 13C and 1H homo and heteronuclear 2D NMR experiments and mass analysis. The development of an enantioselective synthesis of 3-(2′-acetoxy-4-phenylbut-3′-enoylamino)propionic acid allowed to confirm the structure and assign the (R) absolute