申请人:E. R. Squibb & Sons, Inc.
公开号:US04804770A1
公开(公告)日:1989-02-14
A process is provided for preparing the keto-phosphonate ##STR1## in enantiomerically homogeneous form, by reacting the anhydride ##STR2## with S-.alpha.-methylbenzylamine to effect diastereoselective opening of the anhydride to give a mixture of amides ##STR3## separating the amides, for example, by frictional crystallization, and converting the desired amide IVA (which is obtained in high yield from the anhydride) to enantiomerically homogeneous ketophosphonate in high yield and on a large scale. The so-formed ketophosphonate is useful in the synthesis of compactin as well as 7-substituted-(3,5-dihydroxy)-hept-6-enoic and -heptanoic acid HMG-CoA reductase inhibitors.
提供了一种制备酮磷酸酯##STR1##的过程,以对映异构体均一形式存在,通过将酐##STR2##与S-.alpha.-甲基苄胺反应,实现选择性开环酐生成一种酰胺混合物##STR3##,通过分离酰胺,例如通过摩擦结晶,将从酐中高产率获得的所需酰胺 IVA 转化为对映异构体均一的酮磷酸酯,产率高且规模大。这样形成的酮磷酸酯在紧凑素合成中以及7-取代-(3,5-二羟基)-庚-6-烯酸和-庚酸 HMG-CoA 还原酶抑制剂的合成中具有用途。