The object of the present invention is to provide a method for producing in high yield with high stereoselectivity an optically active 5-hydroxy-3-ketoester compound which is useful as an intermediate for a pharmaceutical. A novel method for producing an optically active 5-hydroxy-3-ketoester compound in which an asymmetric aldol reaction by use of 1,3-diene compound is carried out in the presence of an optically active binaphthol-titanium complex together with a substituted nitrogen-containing 5 or 6-membered aromatic heterocyclic compound to obtain an optically active 5-hydroxy-3-ketoester compound in high yield with high stereoselectivity; and a novel production intermediate having a crystalline form.
本发明的目的是提供一种高产率、高立体选择性的生产方法,用于制备一种可作为制药中间体的光学活性5-羟基-3-
酮酯化合物。一种新颖的方法用于生产光学活性的5-羟基-3-
酮酯化合物,其中在存在光学活性的联
萘酚-
钛复合物的情况下,通过使用1,3-二烯化合物进行不对称的醛缩反应,同时加入一种取代氮含量的5或6-成员芳香
杂环化合物,以高产率和高立体选择性获得光学活性的5-羟基-3-
酮酯化合物;以及一种具有结晶形式的新型生产中间体。