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0 °C

3-Bromo-5-chloro-1H-indazole-7-carbaldehyde (1.4 g, 5.4 mmol) and N-methyldicyclohexylamine (1.6 mL, 7.28 mmol) were suspended in tetrahydrofuran (6 mL), cooled to 0° C., and treated with (2-(chloromethoxy)ethyl)trimethylsilane (2.0 mL, 6.74 mmol). The ice bath was removed and stirring continued for 4 h. The reaction was poured into ethyl acetate, washed with water (3×), 1M potassium bisulfate (2×), then brine (2×), dried over sodium sulfate, and concentrated. Column chromatography on silica gel (10% ethyl acetate/hexanes) gave 1.45 g (69%) as a faint yellow oil. 1H-NMR (CDCl3, 500 MHz) δ 10.28 (s, 1H), 7.97 (d, J=1.83 Hz, 1H), 7.87 (d, J=2.14 Hz, 1H), 6.0(s, 2H), 3.48-3.51 (m, 2H), 0.80-0.83 (m, 2H), 0.10 (s, 9H).

1. customThe ice bath was removed
2. additionThe reaction was poured into ethyl acetate
3. washwashed with water (3×), 1M potassium bisulfate (2×)
4. dry with materialbrine (2×), dried over sodium sulfate
5. concentrationconcentrated
6. customColumn chromatography on silica gel (10% ethyl acetate/hexanes) gave 1.45 g (69%) as a faint yellow oil