Multi-step reaction with 9 steps
1.1: 88 percent / aq. HF / acetonitrile / 8 h / 20 °C
2.1: 96 percent / HOBt; EDC; DIEA / CH2Cl2 / 6 h / 0 - 20 °C
3.1: aq. HF / acetonitrile / 8 h / 20 °C
4.1: 763 mg / HATU; DIEA / CH2Cl2 / 24 h
5.1: 2,6-lutidine; TMSOTf / CH2Cl2 / 1 h / 20 °C
5.2: MeOH / 2 h
6.1: 570 mg / Et3N / CH2Cl2 / 2 h
7.1: aq. LiOH / tetrahydrofuran / 1 h / 20 °C
8.1: Cu(OAc)2; pyridine / tetrahydrofuran / 2 h / 20 °C
9.1: 174 mg / 1,5,7-triaza-bicyclo[4.4.0]dec-5-ene polystyrene / CH2Cl2 / 1 h / 0 °C
With
pyridine; 2,6-dimethylpyridine; lithium hydroxide; copper diacetate; trimethylsilyl trifluoromethanesulfonate; 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine; hydrogen fluoride; benzotriazol-1-ol; N-(3-dimethylaminopropyl)-N-ethylcarbodiimide; triethylamine; N-ethyl-N,N-diisopropylamine; N-[(dimethylamino)-3-oxo-1H-1,2,3-triazolo[4,5-b]pyridin-1-yl-methylene]-N-methylmethanaminium hexafluorophosphate;
In
tetrahydrofuran; dichloromethane; acetonitrile;
DOI:10.1016/j.tet.2003.04.005