substituierten Acetondicarbonsäureestern und o‐Aminothiophenol werden 2‐Alkyl‐sowie 2,4‐Dialkyl‐3‐hydroxy‐1‐oxo‐1H‐benzo [d] pyrido [2,1‐b] thiazole dargestellt. Die Umsetzung des Natriumsalzes eines Benzopyridothiazols mit Alkylhalogeniden führt neben der Bildung von O‐Alkyl‐Derivaten zur Alkylierung an C‐2. Die Struktur dieser Heterocyclen sowie ihrer O‐Methyl‐ und O‐Acetyl‐Derivate wird 1H‐NMR‐spektroskopisch
Methods for producing hydroxy amino acids and derivatives thereof
申请人:Rozzell David J.
公开号:US20050100993A1
公开(公告)日:2005-05-12
Hydroxy-amino acids are provided and are prepared by contacting a substituted P-ketodiester having a ketone group and two ester functional groups with a ketoreductase under conditions permitting the reduction of the keytone group to an alcohol. Only one of the ester functional groups is regioselectively hydrolyzed to the corresponding carboxylic acid, whereby a non-hydrolyzed ester functional group remains. The carboxylic acid is converted to an amine to produce a hydroxy-amino acid.
Methods for producing hydroxy amino acids, esters, and derivatives thereof
申请人:Rozzell David J.
公开号:US20050192439A1
公开(公告)日:2005-09-01
A method for producing a hydroxy-amino ester, or derivative thereof, is provided. A substituted β-ketodiester having a ketone group and two ester functional groups is contacted with a ketoreductase under conditions permitting the reduction of the ketone group to an alcohol. Only one of the ester functional groups is regioselectively hydrolyzed to the corresponding carboxylic acid, whereby a non-hydrolyzed ester functional group remains. The carboxylic acid is converted to an amine or a derivative thereof to produce a hydroxy-amino ester or derivative thereof. A number of novel hydroxy-amino esters are prepared by the method.