1: 10percent HCl / methanol / 1 h / Ambient temperature 2: diethyl phosphorocyanidate, triethylamine / tetrahydrofuran / 1) 0 deg C, 1 h, 2) r.t., 40 min 4: 80 percent / H2 / 5percent Pd-C / ethanol / 1 h / Ambient temperature View Scheme

Multi-step reaction with 2 steps 1: 10percent HCl / methanol / 1 h / Ambient temperature2: diethyl phosphorocyanidate, N,N-diisopropylethylamine / dimethylformamide / 1) 0 deg C, 1 h, 2) r.t., 2 h  

Multi-step reaction with 3 steps 1: 10percent HCl / methanol / 1 h / Ambient temperature2: diethyl phosphorocyanidate, triethylamine / tetrahydrofuran / 1) 0 deg C, 1 h, 2) r.t., 40 min  

Multi-step reaction with 2 steps 1: 10percent HCl / methanol / 1 h / Ambient temperature2: diethyl phosphorocyanidate, triethylamine / tetrahydrofuran / 1) 0 deg C, 1 h, 2) r.t., 40 min