Process for preparing 2,2-difluoroethylamine derivatives, wherein compounds of the general formula (IV) are reduced to the corresponding 2,2-difluoroethylamine derivatives of the general formula (III), where the A radical is as defined in the description:
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.
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:US09139547B2
公开(公告)日:2015-09-22
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 R1 are as defined in the description,
which proceeds from malonic ester and does not require isolation of intermediates.