Multi-step reaction with 7 steps
1: 5.50 g / 1-ethyl-3-<(3-dimethylamino)propyl>carbodiimide*HCl, 1-hydroxybenzotriazole hydrate, triethylamine / dimethylformamide / 18 h / Ambient temperature
2: 89 percent / trifluoroacetic acid / CHCl3 / 3 h / Ambient temperature
3: 35 percent / W-200-N alumina / tetrahydrofuran; diethyl ether / 72 h / Ambient temperature
4: 72 percent / 2 N aq. HCl / methanol / 2 h / 60 °C
5: 84 percent / 3-hydroxy-1,2,3-benzotriazin-4(3H)-one (HOOBT), 1-ethyl-3-<(3-dimethylamino)propyl>carbodiimide*HCl, diisopropylethylamine / ethyl acetate; CH2Cl2 / 18 h / Ambient temperature
6: 97 percent / trifluoroacetic acid / 1 h / 0 °C
7: 56 percent / 1-hydroxybenzotriazole hydrate, 1-ethyl-3-<(3-dimethylamino)propyl>carbodiimide*HCl, triethylamine / dimethylformamide / 6 h / Ambient temperature
With
hydrogenchloride; W-200-N alumina; 1-hydroxybenzotriazol-hydrate; 1-ethyl-(3-(3-dimethylamino)propyl)-carbodiimide hydrochloride; triethylamine; N-ethyl-N,N-diisopropylamine; 3-hydroxy-3,4-dihydrobenzotriazine-4-one; trifluoroacetic acid;
In
tetrahydrofuran; methanol; diethyl ether; dichloromethane; chloroform; ethyl acetate; N,N-dimethyl-formamide;
DOI:10.1021/jm00092a002