Multi-step reaction with 11 steps
1: benzylamine / tetrahydrofuran / 6 h
2: 1H-imidazole / dichloromethane / 24 h
3: sodium methylate; methanol / 12 h
4: toluene-4-sulfonic acid / acetonitrile / 3 h / 20 °C
5: dicyclohexyl-carbodiimide; dmap / dichloromethane / 3 h
6: triethylsilane; trifluoroacetic acid / dichloromethane / 0.67 h / 20 °C / Molecular sieve
7: pyridine / 1.16 h / 0 - 20 °C
8: pyridine hydrofluoride / tetrahydrofuran / 120 h / 0 °C
9: 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / 1 h / 20 °C
10: trimethylsilyl trifluoromethanesulfonate / dichloromethane / 0.33 h / 0 °C / Molecular sieve; Inert atmosphere
11: hydrazine hydrate; pyridine; acetic acid / dichloromethane / 2 h / 20 °C
With
pyridine; 1H-imidazole; methanol; triethylsilane; dmap; pyridine hydrofluoride; trimethylsilyl trifluoromethanesulfonate; sodium methylate; toluene-4-sulfonic acid; hydrazine hydrate; acetic acid; 1,8-diazabicyclo[5.4.0]undec-7-ene; dicyclohexyl-carbodiimide; benzylamine; trifluoroacetic acid;
In
tetrahydrofuran; dichloromethane; acetonitrile;
DOI:10.1016/j.carres.2014.05.007