Novel chiral bifunctional l-thiazoline-amide derivatives: design and application in the direct enantioselective aldol reactions
作者:Zhiyong Gong、Chiyu Wei、Ye Shi、Qingchuan Zheng、Zhiguang Song、Zaiqun Liu
DOI:10.1016/j.tet.2014.01.006
日期:2014.3
Several novel chiral bifunctional l-thiazoline-amide derivatives were simply synthesized from commercially available l-cysteine and l-proline in high yield. These catalysts were subsequently applied to the direct enantioselective aldol reactions of various aldehydes, which are rarely reported in the literature. The products with anti configuration were obtained up to 97% ee and 99% dr when the l-thiazoline-amide
从市售的1-半胱氨酸和1-脯氨酸以高收率简单地合成了几种新颖的手性双官能的1-噻唑啉-酰胺衍生物。随后将这些催化剂用于各种醛的直接对映选择性醛醇缩合反应,这在文献中很少报道。当使用1-噻唑啉-酰胺衍生物时,获得具有高达97%的ee和99%的dr的具有反构型的产物。提出了一个合理的过渡态模型来解释观察到的对映异构和非对映选择性。