反应详情

To a solution of (±)-1-(5-methoxy-2-((2-(trimethylsilyl)ethoxy)methyl)-2H-indazol-7-yl)ethanol (712 mg, 2.21 mmol) and carbon tetrabromide (1.10 g, 3.31 mmol) in tetrahydrofuran (10 mL) at 0° C. was added triphenylphosphine (869 mg, 3.31 mmol). The resulting solution was stirred at room temperature for 30 min. The reaction was diluted with several volumes of pentane and filtered to remove undissolved solids. The organics were concentrated and purified by column chromatography (5% 30% EtOAc/Hex) to give 240 mg (28.2%) as colorless oil. 1H-NMR (CDCl3, 300 MHz) δ 7.95 (s, 1H), 7.15 (s, 1H), 6.82 (s, 1H), 5.84 (q, J=6.0 Hz, 1H), 5.67 (s, 2H), 3.8 (s, 3H), 3.62 (m, 2H), 2.94(d, J=6.0 Hz, 2H), 0.9 (m, 2H), −0.06 (s, 9H).

1. filtrationfiltered
2. customto remove undissolved solids
3. concentrationThe organics were concentrated
4. custompurified by column chromatography (5% 30% EtOAc/Hex)
5. customto give 240 mg (28.2%) as colorless oil