PROCESS FOR PREPARING SODIUM SALTS OR POTASSIUM SALTS OF 4-HYDROXY-2-OXO-2,5-DIHYDROFURAN-3-CARBOXYLATE
申请人:Funke Christian
公开号:US20140148604A1
公开(公告)日:2014-05-29
Process for preparing sodium or potassium salts of 4-hydroxy-2-oxo-2,5-dihydrofuran-3-carboxylic esters, comprising the reaction of a malonic ester with potassium hydroxide to give the corresponding malonic ester potassium salt of the formula (III)
which is then reacted further with a chloroacetic ester to give a compound of the formula (V)
followed by a ring closure reaction in which the compound of the formula (V) is reacted with a sodium or potassium alkoxide of the formula ZOR
1
where R
1
, R
2
, R
3
and K are each 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.