The invention provides a novel process for the manufacture of enantiomerically-pure halolactones of the formula I which are useful for the production of certain 5-amino-4-hydroxyvaleric acid derivatives, themselves valuable intermediates in the production of compounds which are renin inhibitors. The process involves a diastereoselective alkylation of an oxazolidinone of the formula III, followed by a highly stereoselective and novel halolactonisation of an oxazolidinone of the formula II. Certain of the oxazolidinones of the formula II are novel and are provided as a further feature of the invention. The invention also provides a novel process for the production of the pharmaceutically-useful 5-amino-4-hydroxyvaleric acid derivatives of formula VI.
本发明提供了一种制备对映纯卤代内酯(式I)的新工艺,该工艺对于生产某些5-
氨基-
4-羟基戊酸衍
生物非常有用,这些衍
生物本身是制备肾素
抑制剂化合物的有价值中间体。该工艺涉及到式III的峰异构体烷基化,然后是式II的高度立体选择性和新颖的卤代内酯化反应。其中,某些式II的峰异构体是新颖的,并作为本发明的另一个特征提供。本发明还提供了一种制备具有药用价值的式VI的5-
氨基-
4-羟基戊酸衍
生物的新工艺。