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With dipyridinium dichromate In dichloromethane at 10 - 20℃; for 3 h;
[0095] Step 3. To a solution of (3-methoxy-5-nitrophenyl)methanol (75 g, 0.41 mol) in CH2C12 (1.5 L) was added pyridinium dichromate (382 g, 1.02 mol) and silica gel (382 g) below 10 °C. After stirring at room temperature for 3 h, TLC analysis showed the starting material was consumed completely (3: 1 petroleum/ethyl acetate, Rf 0.6). The mixture was purified by flash column chromatography using CH2C12 to afford 3-methoxy-5-nitrobenzaldehyde as a yellow solid (170 g, 76percent, 3 batches).
Reference:
[1] Patent: WO2013/148365, 2013, A1, . Location in patent: Paragraph 0095
[2] Journal of Medicinal Chemistry, 2004, vol. 47, # 11, p. 2897 - 2905
[3] MedChemComm, 2018, vol. 9, # 8, p. 1293 - 1304