Multi-step reaction with 8 steps
1.1: 100 percent / Et3N; DMAP / CH2Cl2 / 15 h / 20 °C
2.1: s-BuLi; N,N,N',N'-tetramethylethylenediamine / tetrahydrofuran / 1.5 h / -40 °C
2.2: tetrahydrofuran / 17 h / -40 - -30 °C
2.3: NaH / tetrahydrofuran / 3 h / 70 °C
3.1: K2CO3 / methanol / 3 h / 70 °C
4.1: 85 percent / K2CO3 / acetone / 19 h / 20 °C
5.1: 94 percent / HF*Py / pyridine; CH2Cl2 / 20 °C
6.1: imidazole / dimethylformamide / 2 h / 0 °C
7.1: 64 percent / Et3N; DMAP / CH2Cl2
8.1: 98 percent / HF*Py / pyridine; CH2Cl2 / 113 h / 20 °C
With
1H-imidazole; dmap; N,N,N,N,-tetramethylethylenediamine; sec.-butyllithium; potassium carbonate; pyridine hydrogenfluoride; triethylamine;
In
tetrahydrofuran; pyridine; methanol; dichloromethane; N,N-dimethyl-formamide; acetone;
DOI:10.1016/j.bmcl.2004.02.097