反应详情

A solution of tert-butyl ((3R,4R,5S)-4-{[tert-butyl(dimethyl)silyl]oxy}-5-methylpiperidin-3-yl)carbamate (23 mg, 0.067 mmol, Example 26, Step 7), 4-chloro-3-methyl-5-nitropyridine (from ACES Pharma, 16 mg, 0.096 mmol), and triethylamine (37 μL, 0.27 mmol) in isopropyl alcohol (0.60 mL) was heated at 75° C. in a sealed vial for 16 h. Another portion of 4-chloro-3-methyl-5-nitropyridine (19 mg) was added and stirring was continued for 2 days at 100° C. The crude reaction mixture was purified by flash chromatography (24 g silica gel column, eluting with 0-100% EtOAc/hexanes) to afford the sub-title compound (12 mg, 37% yield). LCMS (ESI) calc. for C23H41N4O5Si [M+H]+: m/z=481.3. found 481.3.

1. customThe crude reaction mixture
2. customwas purified by flash chromatography (24 g silica gel column, eluting with 0-100% EtOAc/hexanes)