The present invention provides a process from preparing isocoumarin-3-yl derivatives comprising reacting a homophthalic anhydride derivative with a carbonyl compound, wherein the carbonyl group is substituted with an acyl activating group, in the presence of a reaction medium comprising a solvent and a base. The invention also encompasses a process for the preparation of homophthalate esters useful in the preparation of homophthalic anhydride reactants as well as an integrated process wherein the twp reactions are carried out sequentially to afford the desired isocoumarin derivative.
The present invention provides a process for the preparation of homophthlate esters useful in the preparation of homophthalic anhydride reactants.
本发明提供了一种制备同苯二甲酸酯的方法,该方法有助于制备同苯二甲酸酐反应物。
PREPARATION OF ISOCOUMARIN DERIVATIVES AND INTERMEDIATES FOR THE SYNTHESIS THEREOF
申请人:Mercian Corporation
公开号:EP1364947A1
公开(公告)日:2003-11-26
A method of preparing optically active isocoumarin-3-yl-acetic acid derivatives represented by Formula (I):
wherein a specific isocoumarin-ketene derivative is subjected to an addition reaction with an optically active alcohol, and then the ester thus obtained is subjected to a hydrolysis reaction. An intermediate for synthesis used therein. A method of preparing isocoumarin-3-yl-acetic acid derivatives represented by Formula (III):
wherein a specific isocoumarin derivative is subjected to an addition reaction with carbon monoxide and oxygen in the presence of a transition metal catalyst. An intermediate for synthesis used therein.