1: With 2,6-dimethylpyridine; 2,6-lutidinium trifluoromethanesulfonate; (+)-(2S)-2-(3-ethylbenzyl)-2,3-dimethylimidazolidin-4-one in dimethyl sulfoxide; acetonitrile 16 h; 2: With potassium permanganate; sodium dihydrogenphosphate in water; tert-butyl alcohol 3 h; Overall yield = 22 mg;

1: With 2,6-dimethylpyridine; 2,6-lutidinium trifluoromethanesulfonate; (+)-(2S)-2-(3-ethylbenzyl)-2,3-dimethylimidazolidin-4-one in dimethyl sulfoxide; acetonitrile 16 h; 2: With potassium permanganate; sodium dihydrogenphosphate in water; tert-butyl alcohol 3 h; Overall yield = 22 mg;