An efficient and stereodivergent synthesis of threo- and erythro-β-methylphenylalanine. Resolution of each racemic pair by semipreparative HPLC
作者:Miriam Alı́as、Marı́a Pilar López、Carlos Cativiela
DOI:10.1016/j.tet.2003.11.044
日期:2004.1
amino acid (βMe)Phe can be obtained separately on a multigram scale through a three-step synthesis from the corresponding Z and E isomers of 2-phenyl-4(α-phenylethylidene)-5(4H)-oxazolone. The 5(4H)-oxazolones are readily available from acetophenone and hippuric acid. The four enantiomerically pure isomers of β-methylphenylalanine, (2R,3R)-(βMe)Phe, (2S,3S)-(βMe)Phe, (2R,3S)-(βMe)Phe and (2S,3R)-(βMe)Phe
受限氨基酸(βMe)Phe的苏式和赤式非对映异构体可以通过三步合成法从2-苯基-4(α-苯基亚乙基)-5(4 H)的相应Z和E异构体以多克级分别获得)-恶唑酮。5(4 H)-恶唑酮可容易地从苯乙酮和马尿酸获得。β-甲基苯丙氨酸的四个对映体纯异构体,(2 R,3 R)-(βMe)Phe,(2 S,3 S)-(βMe)Phe,(2 R,3 S)-(βMe)Phe和( 2 S,3 R)-(βMe)Phe已通过HPLC拆分外消旋母体苏式(或赤式)-2-苯甲酰胺-3-苯基丁酸甲酯制备。