申请人:Chinoin Gyogyszer- Es Vegyeszeti Termekek Gyara RT
公开号:US05235109A1
公开(公告)日:1993-08-10
The invention relates to an improved, large scale process for the preparation of compounds of formula (I) ##STR1## wherein R is halogen atom or hydroxyl, R.sup.2 is hydrogen atom or hydroxyl, R.sup.3 and R.sup.4 are hydrogen or alkoxy having 1-6 carbon atoms.
这项发明涉及一种改进的、大规模的工艺,用于制备化合物的公式(I)其中R是卤素原子或羟基,R.sup.2是氢原子或羟基,R.sup.3和R.sup.4是氢或含有1-6个碳原子的烷氧基。