1: N-[(1,1-dimethylethoxy)carbonyl]-S-trityl-L-cysteine With 4-methyl-morpholine; isobutyl chloroformate in dichloromethane T=-15°C; 0.25 h; 2: O,N-dimethyl-hydroxylamine hydrochloride in dichloromethane T=20°C; 16 h;

1: N-methylpiperidine / CH2Cl2 / 0.08 h / -20 °C 2: N-methylpiperidine / CH2Cl2 View Scheme

1-methyl-piperidine in dichloromethane Yield given;