摘要:
The invention disclosed relates to a process for the enzymatic esterification and transesterification of racemic carboxylic acids and alcohols in which the reaction products predominantly include the ester of the more reactive acid or alcohol enantiomer and the less reactive acid or alcohol enantiomer, wherein the reactions are effected, preferably in a solventless medium, and the by-product water or short-chain alcohol is removed as it is formed.
摘要:
The invention disclosed relates to the biological production of substantially isomerically pure (R)-baclofen and structurally related compounds, from the racemic mixture of (R)- and (S)-isomers thereof, and to the isolation of a Streptomyces microorganism from Nature which is capable of preferentially metabolizing one of the isomers while showing minimal metabolic activity on the other isomer. A fermentation or bioconversion process using this microorganism or the cell-free enzymes derived therefrom for the biological resolution of a racemic mixture of (R)- and (S)-baclofen and structurally related compounds is also disclosed.
摘要:
The invention disclosed relates to a process for the preparation of sugar and sugar alcohol esters of general formula I(R--COO--).sub.n --R.sup.1 (I)wherein R is an alkyl group, R.sup.1 is derived from a sugar or a polyol moiety and n is 1 to 3, comprising reacting a sugar or a polyol with an acyl moiety, such as a carboxylic acid or ester, in a suitable solvent therefor and in the presence of an enzymatic catalyst capable of catalyzing the formation of ester bonds, and under reduced pressure sufficient to vaporize the solvent and by-product water, and continuously removing the water.