申请人:Hoechst-Roussel Pharmaceuticals Inc.
公开号:US04417063A1
公开(公告)日:1983-11-22
A method for the preparation of 6,11-dihydro-11-oxodibenz[b,e]oxepin-acetic acids having pharmaceutical activity is disclosed. Compounds represented by the formula: ##STR1## wherein R is OH or Cl are provided as intermediates. An aldehyde of the formula: ##STR2## wherein R.sub.1 is a lower alkyl, e.g., 1 to 4 carbon atoms, is reacted with chloroform and aqueous base to form an .alpha.-hydroxy dicarboxylic acid. Alternatively, the aldehyde can be converted to the corresponding cyanohydrin, which is then converted to the corresponding .alpha.-hydroxy dicarboxylic acid. The .alpha.-hydroxy dicarboxylic acid can also be prepared from reaction of a halogenated toluate of the formula: ##STR3## wherein X is Cl or Br with mandelic acid or a derivative thereof of the formula: ##STR4## wherein R.sub.3 and R.sub.4 are independently selected from hydrogen and alkyl of 1 to 4 carbon atoms. The .alpha.-hydroxy dicarboxylic acid is cyclized and then converted to the oxepin acetic acid by reduction. Alternatively, the .alpha.-hydroxy dicarboxylic acid is cyclized and converted to an .alpha.-chloro-substituted oxepin acetic acid, which is then converted to the unsubstituted oxepin acetic acid by reductive removal of chlorine.
揭示了一种制备具有药用活性的6,11-二氢-11-氧代二苯并[b,e]噁啶-乙酸的方法。提供了由下式表示的化合物作为中间体:其中R为OH或Cl。将下式的醛与氯仿和水基反应形成α-羟基二羧酸:其中R₁为较低的烷基,例如,1至4个碳原子。或者,可以将醛转化为相应的氰基醇,然后将其转化为相应的α-羟基二羧酸。α-羟基二羧酸也可以通过下式的卤代对甲苯酸与苯乙醇酸或其衍生物反应制备:其中X为Cl或Br,R₃和R₄分别独立选择自氢和1至4个碳原子的烷基。α-羟基二羧酸环化,然后通过还原转化为噁啶乙酸。或者,α-羟基二羧酸环化并转化为α-氯取代的噁啶乙酸,然后通过还原去除氯转化为未取代的噁啶乙酸。