Multi-step reaction with 8 steps
1: 16 h / Ambient temperature
2: 1.) (Ph)3P, diethyl azodicarboxylate (DEAD) / 1.) THF, -78 deg C, 2.) THF, a) -78 deg C, 1 h, b) RT, 18 h
3: LiOH / tetrahydrofuran / 1.5 h / 5 °C
4: N,N-diisopropylethylemine / CH2Cl2 / Ambient temperature
5: KOH / H2O / 24 h / Heating
6: 1.) 1-hydroxybenztriazole hydrate (HOBT), 2.) 1-<3-(dimethylamino)propyl>-3-ethylcarbodiimide hydrochloride (EDC) / 1.) DMF, -20 deg C, 2.) DMF, from -20 deg C to RT, overnight
7: 1.) NaH / 1.) THF, DMF, 45 deg C, 3 h, 2.) THF, 45 deg C , 45 min
8: 1.) 1-hydroxybenztriazole (HOBT), N-methylmorpholine, 2.) 1-<3-(dimethylamino)propyl>-3-ethylcarbodiimide hydrochloride / 1.) DMF, -23 deg C, 2.) DMF, from -23 deg C to RT, 18 h
With
4-methyl-morpholine; potassium hydroxide; lithium hydroxide; sodium hydride; benzotriazol-1-ol; 1-hydroxybenzotriazol-hydrate; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; N-ethyl-N,N-diisopropylamine; triphenylphosphine; diethylazodicarboxylate;
In
tetrahydrofuran; dichloromethane; water;
DOI:10.1021/jm00088a006