PROCESS OF MAKING PROSTACYCLIN COMPOUNDS WITH LINKER THIOL AND PEGYLATED FORMS
申请人:United Therapeutics Corporation
公开号:US20140288314A1
公开(公告)日:2014-09-25
A process provides for producing chiral prostacyclin derivatives of Formula (I)
in high yield from meso anhydrides.
该过程提供了一种从中间酐高产率制备手性前列环素衍生物的方法(I)。
US9102660B2
申请人:——
公开号:US9102660B2
公开(公告)日:2015-08-11
[EN] PROCESS OF MAKING PROSTACYCLIN COMPOUNDS WITH LINKER THIOL AND PEGYLATED FORMS<br/>[FR] PROCÉDÉ DE FABRICATION DE COMPOSÉS DE PROSTACYCLINE AYANT UN LIEUR THIOL ET DES FORMES PÉGYLÉES
申请人:UNITED THERAPEUTICS CORP
公开号:WO2014160638A1
公开(公告)日:2014-10-02
A process provides for producing chiral prostacyclin derivatives of Formula (I) in high yield from meso anhydrides.
Selective monoesterification of dicarboxylic acids catalysed by ion-exchange resins
Symmetrical dicarboxylic acids with 4–14 carbon atoms gave selectively the corresponding monoesters in high yields in the transesterification catalysed by strongly acidic ion-exchange resins in ester–hydrocarbon mixtures. It was found that the rate of the esterification of the dicarboxylic acids is much higher than that of the monocarboxylic acids formed. This result can explain the high selectivity for the monoester formation and can also be explained by the existence of an aqueous layer on the surface of the resins. This method of selective esterification is quite simple and practical.