Multi-step reaction with 10 steps
1: 87 percent / NaOH; NBu4HSO4 / CH2Cl2 / 1 h / Heating
2: TFA / CH2Cl2 / 1 h / 20 °C
3: 521 mg / HOBt; EDC; DIEA / dimethylformamide / 6 h / 0 - 20 °C
4: TFA / CH2Cl2 / 0.5 h / 20 °C
5: HATU; DIEA / dimethylformamide / 6 h / 0 - 20 °C
6: TFA / CH2Cl2
7: 158 mg / Et3N / CH2Cl2
8: aq. LiOH / tetrahydrofuran / 1 h
9: Cu(OAc)2; pyridine / tetrahydrofuran / 2 h / 20 °C
10: 62.5 mg / 1,5,7-triaza-bicyclo[4.4.0]dec-5-ene polystyrene resin / CH2Cl2 / 1 h / 0 °C
With
pyridine; lithium hydroxide; sodium hydroxide; copper diacetate; 1,5,7-triaza-bicyclo[4.4.0]dec-5-ene polystyrene resin; tetra(n-butyl)ammonium hydrogensulfate; benzotriazol-1-ol; N-(3-dimethylaminopropyl)-N-ethylcarbodiimide; triethylamine; N-ethyl-N,N-diisopropylamine; trifluoroacetic acid; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate;
In
tetrahydrofuran; dichloromethane; N,N-dimethyl-formamide;
DOI:10.1016/j.tet.2003.04.005