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Abstract

The invention relates to a process for preparing chiral imidazolidin-2-ones of the formula I ##STR00001## in which R.sup.1 is C.sub.1-C.sub.8-alkyl, cyclohexyl, phenyl, a C.sub.1-C.sub.6-alkyl-, halo-, nitro-, C.sub.1-C.sub.6-alkoxy-, C.sub.1-C.sub.6-alkylmercapto- or CF.sub.3-substituted phenyl radical, naphthyl or a C.sub.1-C.sub.6-alkyl-, halo-, nitro-, C.sub.1-C.sub.6-alkoxy- or CF.sub.3-substituted naphthyl radical, R.sup.2 is C.sub.1-C.sub.8-alkyl, C.sub.2-C.sub.8-alkenyl, cyclohexyl, phenyl or a phenyl-C.sub.1-C.sub.6-alkyl radical which may be substituted by a nitro, C.sub.1-C.sub.6-alkoxy, methylenedioxy or CF.sub.3 radical, and R.sup.3 is C.sub.1-C.sub.12-alkyl, C.sub.2-C.sub.8-alkenyl, cyclohexyl, phenyl or a C.sub.1-C.sub.6-alkyl-, halo-, nitro-, C.sub.1-C.sub.6-alkoxy-, methylenedioxy-, dialkylamino- or CF.sub.3-substituted phenyl radical, by reacting a compound of the formula II or the salt thereof ##STR00002## in which R.sup.1, R.sup.2 and R.sup.3 have the abovementioned meaning, with urea in the presence of an involatile ammonium salt, wherein the reaction is carried out in the presence of an aprotic polar organic solvent.

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First Claim