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    • 45. 发明申请
    • METHOD FOR PREPARING DIFUNCTIONAL COMPOUNDS HAVING HIGH ENANTIOMERIC PURITY
    • 制备具有高透光性的多功能化合物的方法
    • WO1994029253A1
    • 1994-12-22
    • PCT/FR1994000673
    • 1994-06-08
    • RHONE-POULENC CHIMIERADISSON, Xavier
    • RHONE-POULENC CHIMIE
    • C07C29/147
    • C07C31/20C07B53/00C07C29/147C07C31/205C07C33/22
    • A method for preparing difunctional compounds, e.g. diols, having high enantiomeric purity (compound If) from alpha -hydroxycarboxylic acid esters (compound Id) in an anhydrous medium by a) reducing compound (Id) into compound (If) in an organic solvent medium; b) adding to the reaction medium at least one coreagent which is substituted by at least one and preferably at least two XH or YH radicals, can move compound (If) in the intermediate from a), and has a higher boiling point at normal atmospheric pressure than compound (If); and c) directly distilling the reaction medium to recover said compound (If). The coreagent is pyrocatechol, hydride, NaBH4. The method may be used to prepare an intermediate for chiral synthesis.
    • 制备双官能化合物的方法,例如 在无水介质中由α-羟基羧酸酯(化合物Id)具有高对映体纯度的二醇(化合物If)a)在有机溶剂介质中还原化合物(Id)成化合物(If); b)向反应介质中加入至少一个被至少一个,优选至少两个XH或YH基取代的化合物,可以从a)移动中间体中的化合物(If),并在正常大气压下具有较高的沸点 压力比化合物(If); 和c)直接蒸馏反应介质以回收所述化合物(If)。 核心剂是邻苯二酚,氢化物,NaBH 4。 该方法可用于制备用于手性合成的中间体。