Pharmaceutically useful optically active .alpha.-arylalkanoic acids or esters, ortho esters, or amides thereof are stereoselectively prepared by contacting an aryl magnesium Grignard reagent with an optically active .alpha.-substituted acyl halide to form the optically active aryl .alpha.-substituted alkyl ketone, which is ketalized and rearranged to the desired optically active .alpha.-arylalkanoic acid or the corresponding ester, ortho ester or amide. In an alternate embodiment, the aryl .alpha.-substituted alkyl ketone is reduced to the corresponding alkanol, which is rearranged to the .alpha.-arylalkanal. The alkanal so produced is converted to the desired optically active .alpha.-arylalkanoic acid by conventional methods.
制备药用光学活性的α-芳基烷基酸或酯、ortho酯或其酰胺的方法是,将芳基
镁Grignard试剂与光学活性的α-取代
酰卤反应,形成光学活性的芳基α-取代烷基酮,然后进行
缩酮和重排,以制备所需的光学活性α-芳基烷基酸或其相应的酯、ortho酯或酰胺。在另一种实施方案中,将芳基α-取代烷基酮还原为相应的
脂肪醇,然后重排为α-芳基烷醛。所产生的烷醛通过常规方法转化为所需的光学活性α-芳基烷基酸。