Phosphoramidites Are Efficient, Green Organocatalysts for the Michael Reaction. Mechanistic Insights into the Phosphorus-Catalyzed Michael Reaction of Alkynones and Implications for Asymmetric Catalysis
摘要:
Hexamethylphosphorous triamide (HMPT) and other phosphoramidites and phosphites have been found to be efficient catalysts for the Michael reaction of alkenones and alkynones with malonates, (x-cyano, esters, beta-keto esters, and nitro compounds. The relatively nontoxic, easily hydrolyzed HMPT catalyzes the Michael reaction within seconds at room temperature in the absence of a solvent, and the reaction is worked up simply by removing the catalyst in vacuo. The Michael reactions of alkynones, unlike those of alkenones, are shown to be irreversible. The implications for asymmetric catalysis are discussed.
[EN] STEREOSELECTIVE ENZYMATIC SYNTHESIS OF (S) OR (R)-ISO-BUTYL-GLUTARIC ESTER<br/>[FR] SYNTHÈSE ENZYMATIQUE STÉRÉOSÉLECTIVE DE L'ESTER (S) OU (R)-ISOBUTYLGLUTARIQUE
申请人:TEVA PHARMA
公开号:WO2009158343A1
公开(公告)日:2009-12-30
The present invention relates to a stereoselective enzymatic synthesis of (S) or (R)-iso-butyl-glutaric ester, an intermediate of S-Pregabalin.
Stereoselective bioconversion of aliphatic dinitriles into cyano carboxylic acids
申请人:Burns P. Michael
公开号:US20070196905A1
公开(公告)日:2007-08-23
The present invention is directed to a regio- and stereoselective bioconversion of selected aliphatic dinitriles into corresponding cyanocarboxylic acids. More particularly, the present invention provides methods for the conversion of 2-isobutyl-succinonitrile into (S)-3 cyano-5-methylhexanoic acid, which is a useful intermediate in the synthesis of (S)-3(aminomethyl)-5-methylhexanoic acid (pregabalin). Pregabalin can be used for treating certain cerebral diseases, for example, in the treatment and prevention of seizure disorders, pain, and psychotic disorders.
Stereoselective Bioconversion of Aliphatic Dinitriles into Cyano Carboxylic Acids
申请人:Burns Michael P.
公开号:US20100204503A1
公开(公告)日:2010-08-12
The present invention is directed to a regio- and stereoselective bioconversion of selected aliphatic dinitriles into corresponding cyanocarboxylic acids. More particularly, the present invention provides methods for the conversion of 2-isobutyl-succinonitrile into (S)-3 cyano-5-methylhexanoic acid, which is a useful intermediate in the synthesis of (S)-3(aminomethyl)-5-methylhexanoic acid (pregabalin). Pregabalin can be used for treating certain cerebral diseases, for example, in the treatment and prevention of seizure disorders, pain, and psychotic disorders.