1.1: triethylamine / dichloromethane / 3 h / 0 °C 2.1: (+)-(2S)-2-(3-ethylbenzyl)-2,3-dimethylimidazolidin-4-one; 2,6-lutidinium trifluoromethanesulfonate; 2,6-dimethylpyridine / dimethyl sulfoxide; acetonitrile / 16 h 2.2: 3 h View Scheme

1.1: triethylamine / dichloromethane / 3 h / 0 °C 2.1: (+)-(2S)-2-(3-ethylbenzyl)-2,3-dimethylimidazolidin-4-one; 2,6-lutidinium trifluoromethanesulfonate; 2,6-dimethylpyridine / dimethyl sulfoxide; acetonitrile / 16 h 2.2: 3 h View Scheme