Multi-step reaction with 8 steps
1: 85.9 percent / dicyclohexylcarbodiimide (DCCI), 1-hydroxybenzotriazole (HOBt), Et3N / dimethylformamide / 4 °C
2: 83.6 percent / 6N HCl, dithioethane / ethyl acetate / 1 h
3: 89.7 percent / Et3N / dimethylformamide / Ambient temperature
4: 3N HCl / ethyl acetate
5: 83 percent / Et3N, 1-hydroxybenzotriazole (HOBt), dicyclohexylcarbodiimide (DCCI) / dimethylformamide / 4 °C
6: 74.5 percent / hydrazine / methanol / Ambient temperature
7: HCl, t-butylnitrite / dimethylformamide; dioxane / 0.08 h / -20 °C
8: Et3N / dimethylformamide; dioxane / 16 h / 4 °C
With
hydrogenchloride; tert.-butylnitrite; benzotriazol-1-ol; ethane-1,2-dithiol; triethylamine; dicyclohexyl-carbodiimide; hydrazine;
In
1,4-dioxane; methanol; ethyl acetate; N,N-dimethyl-formamide;