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US 5,183,909 AGranted
Mono ester of dicarboxylic acid
AssigneeShionogi & Co., Ltd.
InventorsMitsuaki Ohtani, Takaharu Matsuura
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Abstract
Optically active mono-esters of dicarboxylic acid of the formula III: ##STR1## being useful as intermediates for preparing optically active natural products or medicines; asymmetric synthesis process for preparing thereof being characterized by the reaction of an acid anhydride with an (R)- or (S)-arylacetic acid derivative; and the key substances therefor are also claimed.
Claims1
An optically active mono-ester of a dicarboxylic acid of the formulas:
- ##STR68## wherein X is --O--;
- Y is --(CH.sub.2).sub.2 --;
- R.sup.1 is alkyl which may be substituted by alkoxy, halogen, amino, amino derivative, or nitro or R.sup.1 is alkenyl, aryl, or aralkyl, each of which may be substituted by alkyl, alkoxy, halogen, amino, amino derivative, or nitro or the enantiomer of said carboxylic acid esters of the aforementioned formulas.
Dependencies are inferred from the claim text.