Chiral environment specifically induced by metal ion: Asymmetric α-alkylation of α-amino esters using pyridoxal derivatives having a chiral ionophore function
作者:Kazuyuki Miyashita、Hideto Miyabe、Kuninori Tai、Chiaki Kurozumi、Hiroshi Iwaki、Takeshi Imanishi
DOI:10.1016/s0040-4020(99)00708-5
日期:1999.10
prepared from α-amino esters and pyridoxal models having an ionophoric side-chain composed of a chiral glycerol structure, proceeded in the presence of Li+ or Na+ to afford α,α-dialkyl amino esters after acidic hydrolysis. Both the structure of the side chain and the metal ion were found to be in relation with the stereoselectivity, affording the highest stereoselectivity when the side-chain having a 2-naphthylmethoxy
由α-氨基酯和具有由手性甘油结构组成的离子性侧链的吡ation醛模型制备的醛亚胺的立体选择性烷基化在Li +或Na +存在下进行,在酸性水解后得到α,α-二烷基氨基酯。发现侧链的结构和金属离子均与立体选择性有关,当在各自的3'-和2'-分别具有2-萘甲氧基和甲氧基的侧链时,立体选择性最高。在Na +存在下进行职位定位。