The (R,R)-diastereoisomer of oxazolidin-2-ones, which are chemical intermediates for the preparation therapeutic agents useful in the treatment of diabetes and hyperglycemia, are prepared substantially free of isomeric forms through reduction of an acid addition salt of an (R)-N-protected-N-phenylcarboxymethyl-1-phenylprop-2-ylamine to form a secondary alcohol of predominantly the (R,R) chiral form in preference to others, removal of the protecting group to form a secondary amine, and allowing the secondary amine to react with a source of carbonyl groups. A typical embodiment involves the preparation of (R,R)-3-[1-(3,4-dimethoxyphenyl)prop-2-yl]-5-(3-chlorophenyl)oxazolidin-2- one in which both the chemical purity and optical purity are in excess of 99%.
奥唑啉-2-酮的(R,R)-对映异构体,用作制备治疗糖尿病和血糖升高的治疗剂的
化学中间体,通过将(R)-N-保护-N-苯基羧甲基-1-苯基丙-2-基胺的酸加成盐还原,主要形成(R,R)手性形式的二级醇,优先于其他形式,去除保护基团形成二级胺,并允许二级胺与碳酰基团的来源反应,从而基本上无对映体形式地制备。一个典型的实施例涉及制备(R,R)-3-[1-(3,4-二
甲氧基苯基)丙-2-基]-5-(3-
氯苯基)奥唑啉-2-酮,其中
化学纯度和光学纯度均超过99%。