Abstract: The present invention relates to a compound of formula (I): wherein: V and U are hydrogen, halogen, C1-C4 alkylamino, or together form a group that contains one or more heteroatoms, and that taken together with one or more: (a) hydrogen atoms; (b) carbon atoms; (c) —CH? groups; (d) —CH2— groups; or (e) additional heteroatoms of the same or different type; or any combination thereof, form a 4-7 membered homocyclic or heterocyclic ring, wherein the homocyclic or heterocyclic ring may combine with the phenyl group to form a bicyclic ring, and wherein the homocyclic or heterocyclic ring or the bicyclic ring may contain one or more oxo, thioxo, amino, mercapto, trifluoromethyl, C1-C4 alkyl, ?S or —SH groups; W: is —CO—, —CH2— or —CH2—(C1-C4 alkyl)-; X: is —CO—; Y: is —O—, C1-C4 alkylene, C1-C4 alkynylene, cycloalkylene, aminocarbonyl, —NH—, —N(C1-C4 alkyl)-, -C1-C4 alkylene-N(C1-C4 alkyl)-, —CH2O—, —CH(OH)— or —OCH2—; Z: is hydrogen, halogen, nitro, amino, C1-C4 alkyl, C1-C4 alkoxy, cyano, trifluorometh

Abstract: A method of preparing cabergoline Form I, comprising forming a solvate including cabergoline and a p-disubstituted benzene of formula (A) or 1,3,5-trimethylbenzene and obtaining cabergoline Form I from the solvate. Another aspect of the present invention provides a method for preparing cabergoline Form I comprising dissolving cabergoline in p-disubstituted benzene or 1,3,5-trimethylbenzene and recovering the cabergoline Form I polymorph, suitably by direct crystallization of Form I or by recovery of a solvate which can be converted to Form I. Another aspect of the present invention provides a novel cabergoline polymorph designated cabergoline Form FB and a method of preparing said polymorph by dissolving or forming a solvate of cabergoline in fluorobenzene and recovering cabergoline Form FB.

Abstract: The present invention discloses a method for preparing cabergoline form I by combining cabergoline and a solvent comprising ethylbenzene to form a solvate and obtaining form I from the solvate. Also disclosed in a method for preparing cabergoline form I by combining cabergoline and a first solvent to form a solution and additionally including a second solvent to the solution, followed by crystallization to form cabergoline form I. Further disclosed is a solvate form of cabergoline comprising cabergoline and ethylbenzene and, optionally, n-heptane.