Sulfuric acid magnesium salt (1:1) → tert-Butyl 5-((4-(5-(3,4-diethoxyphenyl)-1,2,4-oxadiazol-3-yl)indol-1-yl)methyl)-2,2-dimethyl-1,3-dioxan-5-ylcarbamate

Participants

Reaction Conditions

Reaction Steps

A suspension of the product of Example 34, Step D (0.07 g; 0.118 mmol), MnO2 (0.58 g; 6.67 mmol) and anhydrous MgSO4 (0.5 g; 4.2 mmol) in 1,2-dichloroethane (2.5 ml) was vigorously stirred for 2 h at ˜50° C., then overnight at room temperature. This was diluted to 20 ml with CH2Cl2 and filtered through Celite pad, washed with fresh CH2Cl2 (10 ml). The combined organic phase was evaporated under reduced pressure and the residue was purified by FCC (SiO2, CH2Cl2/EtOAc 9:1) to give the title compound (0.02 g; 28%), as creamy solid. 1H-NMR (CDCl3) 1.43-1.53 (m, 21H+H2O); 3.78 (d, 2H, J=11.9 Hz); 3.90 (d, 2H, J=11.9 Hz); 4.13-4.38 (m, 5H); 4.76 (s, 1H); 6.98 (d, 1H, J=8.5 Hz); 7.15 (s, 1H); 7.28-7.34 (m, 2H); 7.68 (d, 1H, J=8.4 Hz); 7.73 (d, 1H, J=1.9 Hz); 7.83 (dd, 1H, J=1.9, 8.4 Hz); 8.03 (d, 1H, J=7.2 Hz).

Provenance & Evidence