| 摘要 |
The invention relates to a process for preparing chiral imidazolidin-2-ones of the formula I in which R<SUP>1 </SUP>is C<SUB>1</SUB>-C<SUB>8</SUB>-alkyl, cyclohexyl, phenyl, a C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl-, halo-, nitro-, C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxy-, C<SUB>1</SUB>-C<SUB>6</SUB>-alkylmercapto- or CF<SUB>3</SUB>-substituted phenyl radical, naphthyl or a C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl-, halo-, nitro-, C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxy- or CF<SUB>3</SUB>-substituted naphthyl radical, R<SUP>2 </SUP>is C<SUB>1</SUB>-C<SUB>8</SUB>-alkyl, C<SUB>2</SUB>-C<SUB>8</SUB>-alkenyl, cyclohexyl, phenyl or a phenyl-C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl radical which may be substituted by a nitro, C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxy, methylenedioxy or CF<SUB>3 </SUB>radical, and R<SUP>3 </SUP>is C<SUB>1</SUB>-C<SUB>12</SUB>-alkyl, C<SUB>2</SUB>-C<SUB>8</SUB>-alkenyl, cyclohexyl, phenyl or a C<SUB>1</SUB>-C<SUB>6</SUB>-alkyl-, halo-, nitro-, C<SUB>1</SUB>-C<SUB>6</SUB>-alkoxy-, methylenedioxy-, dialkylamino- or CF<SUB>3</SUB>-substituted phenyl radical, by reacting a compound of the formula II or the salt thereof in which R<SUP>1</SUP>, R<SUP>2 </SUP>and R<SUP>3 </SUP>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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