This present invention relates to an improved process to prepare prostacyclin derivatives. One embodiment provides for an improved process to convert benzindene triol to treprostinil via salts of treprostinil and to purify treprostinil.

Object of the present invention is an efficient process for the preparation of the active pharmaceutical ingredient Sitagliptine and the 2,4,5-trifluorophenylacetic acid (TFAA) and salt thereof, which is a key intermediate for the synthesis of Sitagliptine. ##STR00001##

Object of the present invention is an efficient process for the preparation of the active pharmaceutical ingredient Sitagliptine and the 2,4,5-trifluorophenylacetic acid (TFAA) and salt thereof, which is a key intermediate for the synthesis of Sitagliptine. ##STR00001##

This present invention relates to an improved process to prepare prostacyclin derivatives. One embodiment provides for an improved process to convert benzindene triol to treprostinil via salts of treprostinil and to purify treprostinil.

This present invention relates to an improved process to prepare prostacyclin derivatives. One embodiment provides for an improved process to convert benzindene triol to treprostinil via salts of treprostinil and to purify treprostinil.

Process for the preparation of a compound of Formula (I): ##STR00001## the process comprising the reaction of a compound of Formula (II) with malononitrile in the presence of a base and a palladium catalyst, ##STR00002## wherein X, Y and Z, independently of each other, represent fluoro, chloro or C.sub.1-4alkyl; and L is a leaving group; with the proviso that 1 or 2 of X and Y are, independently of each other, fluoro or chloro.

Process for the preparation of a compound of Formula (I): ##STR00001## the process comprising the reaction of a compound of Formula (II) with malononitrile in the presence of a base and a palladium catalyst, ##STR00002## wherein X, Y and Z, independently of each other, represent fluoro, chloro or C.sub.1-4alkyl; and L is a leaving group; with the proviso that 1 or 2 of X and Y are, independently of each other, fluoro or chloro.

Process for the preparation of a compound of Formula (I): ##STR00001## the process comprising the reaction of a compound of Formula (II) with malononitrile in the presence of a base and a palladium catalyst, ##STR00002## wherein X, Y and Z, independently of each other, represent fluoro, chloro or C.sub.1-4alkyl; and L is a leaving group; with the proviso that 1 or 2 of X and Y are, independently of each other, fluoro or chloro.

2-(4-chloro-2,6-dimethyl-phenyl)propanedinitrile.

2-(4-chloro-2,6-dimethyl-phenyl)propanedinitrile.