1.1: aq. HCl / Heating 1.2: aq. HCl / 2 h / Heating 2.1: 151 mg / aq. HCl / 0.5 h / Heating View Scheme

1: (3S,6S)-3-isopropyl-6-(cyclohexylmethyl)piperazine-2,5-dione With hydrogenchloride Heating; 2: methanol With hydrogenchloride 2 h; Heating; Further stages.;