MULTISTAGE PROCESS FOR PREPARING ALKALI METAL SALTS OF SPECIFIC 4-HYDROXY-2-OXO-2,5-DIHYDROFURAN-3-CARBOXYLIC ESTERS
申请人:BAYER CROPSCIENCE AG
公开号:US20150210662A1
公开(公告)日:2015-07-30
The present invention relates to a multi-stage method for preparing alkali metal salts of specific 4-hydroxy-2-oxo-2,5-dihydrofuran-3-carboxylic esters of the formula (I),
in which M and R
1
are as defined in the description,
which proceeds from malonic ester and does not require isolation of intermediates.
本发明涉及一种多级方法,用于制备具有特定
化学式(I)的
4-羟基-2-氧代-
2,5-二氢呋喃-3-
羧酸酯的碱
金属盐,其中M和R1如描述中定义,该方法从
丙二酸酯开始,并且不需要分离中间体。