FIELD: chemical technology.
SUBSTANCE: invention describes the improved method for preparing the crystalline form I of cabergoline. Method involves preparing the form V by using heptane as a precipitating solvent and with exclusive conversion to the crystalline form I of cabergoline. Method involves the crystallization stage of the form V from toluene-heptane system of solvents at "reverse addition" of toluene-cabergoline concentrate to cold heptane. Method provides preparing highly pure product with the yield about 90%.
EFFECT: improved preparing method, increased yield.
11 cl, 2 tbl, 5 dwg, 3 ex
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