Optically active alpha-substituted aryl ketones, their preparation and their use in preparing alpha-arylalkanoic acids
申请人:SYNTEX PHARMACEUTICALS
INTERNATIONAL LIMITED
公开号:EP0081993A2
公开(公告)日:1983-06-22
Pharmaceutically useful optically active a-arylalkanoic acids of the formula
where Ar is aryl and R1 is alkyl or cycloalkyl or esters,ortho esters, or amides thereof are stereoselectively prepared by contacting a reagent of the formula Ar-MX, (Ar) 2M or ArM' where M is Cd, Cu(II), Mn(II), Mg or Zn, and M' is Cu(I) or Li, and X is halogen, with an optically active compound of the formula
where Z is a leaving group and Y is halogen, acyloxy or
where R' and R" are alkyl, aryl or with N are a heterocyclic group, to form the optically active ketone of the formula
which is ketalized and rearranged to said acid, ester, ortho ester or amide. Alternatively, said ketone is reduced to the corresponding alkanol, which is rearranged to the a-arylalkanal. The alkanal so produced is converted to said acid by conventional methods.
式中 Ar 为芳基,R1 为烷基或环烷基的具有光学活性的 a-芳基烷酸或其酯、正酯或酰胺,可通过与式中的试剂
其中 Ar 为芳基,R1 为烷基或环烷基或其酯、正交酯或酰胺,通过将式 Ar-MX、(Ar) 2M 或 ArM'(其中 M 为 Cd、Cu(II)、Mn(II)、Mg 或 Zn,M'为 Cu(I) 或 Li,X 为卤素)的试剂与式中的光学活性化合物接触,立体选择性地制备。
其中 Z 是离去基团,Y 是卤素、酰氧基或
其中 R'和 R "为烷基、芳基或与 N 一起为杂环基团,形成式中的光学活性酮。
经酮化后重新排列为所述的酸、酯、正交酯或酰胺。或者,将所述酮还原为相应的烷醇,再重新排列为 a-芳基烷醛。生成的烷醛通过常规方法转化为所述的酸。