申请人:E. R. Squibb & Sons, Inc.
公开号:US04912231A1
公开(公告)日:1990-03-27
A process is provided for preparing (trans)-4-phenyl-L-proline derivatives with excellent stereospecificity, which are useful in preparing certain ACE inhibitors, which process involves reacting a proline derivative of the structure ##STR1## whereing R is a nitrogen protecting group, R.sub.1 is H, aryl, arylalkyl or lower alkyl, and X is a leaving group such as fluorine, an alkyl sulfonate, arylsulfonate or cycloalkyl sulfonate is reacted with an aromatic nucleophile, such as benzene, in the presence of a Lewis acid such as AlCl.sub.3 to form the (trans)-4-phenyl-L-proline derivative of the structure ##STR2##
提供了一种制备(反式)4-苯基-L-脯氨酸衍生物的过程,具有优异的立体特异性,这些衍生物在制备某些ACE抑制剂时非常有用,该过程涉及将结构为##STR1##的脯氨酸衍生物与芳香族亲核试剂反应,其中R是氮保护基,R.sub.1是H,芳基,芳基烷基或较低的烷基,X是如氟,烷基磺酸盐,芳基磺酸盐或环烷基磺酸盐等离子基,反应时在Lewis酸(如AlCl.sub.3)的存在下形成结构为##STR2##的(反式)4-苯基-L-脯氨酸衍生物。