Multi-step reaction with 5 steps
1: 85.6 percent / NaHCO3 / dimethylformamide / 18 h / 60 °C
2: 1) HCl, 2) N-methylmorpholine, N-hydroxybenzotriazole, <(dimethylamino)propyl>ethylcarbodiimide hydrochloride / 1) dioxane, ice bath, 15 min, 2) CH2Cl2, RT, 19 h
3: HCl / dioxane / 1 h / Ambient temperature
4: 66 percent / N-methylmorpholine, hydroxybenzotriazole, <(diisopropyl)ethyl>carbodiimide hydrochloride / CH2Cl2 / 18 h / Ambient temperature
5: 2) pyridine / 1) EtOH, H2O, HOAc, reflux, 6 h, 2) 80 deg C, 18 h
With
4-methyl-morpholine; pyridine; hydrogenchloride; <(diisopropyl)ethyl>carbodiimide hydrochloride; sodium hydrogencarbonate; benzotriazol-1-ol; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride;
In
1,4-dioxane; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1021/jo00303a028