(R)- and (S)-3-hydroxy-4,4-dimethyl-1-phenyl-2-pyrrolidinone as chiral auxiliaries for the asymmetric synthesis of α-hydroxy acids
作者:Pelayo Camps、Francesc Pérez、Núria Soldevilla
DOI:10.1016/s0957-4166(97)00176-6
日期:1997.6
Rac-α-bromo acids, rac-4, have been converted into (R)- or (S)-α-hydroxy acid, (R)- or (S)-9, by DCC-induced esterification with the chiral auxiliaries (R)- or (S)-1, followed by reaction with sodium p-methoxyphenoxide in the presence of tetra-n-hexylammonium iodide, conditions of dynamic kinetic resolution, to give quite diastereoselectively the (αR,3S)- or esters, 7, which were then oxidized with
Rac - α-溴酸rac-4已通过DCC诱导与手性助剂的酯化反应转化为(R)-或(S)-α-羟基酸(R)-或(S)-9 ( R)-或(S)-1 ,然后在动态动力学拆分条件下,在碘化四-正己基铵盐存在下与对甲氧基苯甲酸钠反应,以非对映选择性生成(αR,3S)-或酯7然后将其用硝酸铈铵氧化,并在控制的酸性条件下水解。