With the rapid development and complex challenges of chemical substances, the synthesis of new drugs is usually one of the most effective ways to increase yield.54221-96-4, name is 6-Methoxypicolinaldehyde, molecular formula is C7H7NO2, molecular weight is 137.14, as common compound, the synthetic route is as follows.SDS of cas: 54221-96-4
2-(3,4-dichlorophenyl)acetonitrile (3.50 g, 18.8 mmol) was taken up in THF (30 mL) and diethyl ether (30 mL), and cooled to -78 °C in an acetone-dry ice bath. BuLi (8.1 mL, 20 mmol, 1.6 M in hexane) was added drop-wise, and the temperature was maintained below -60 °C. Once the last drop had been added, the reaction was allowed to stir for 15 minutes. This solution became orange clear. 6- methoxypicolinaldehyde (2.3 mL, 19 mmol) dissolved in THF (20 mL) was added slowly drop-wise, and the temperature was maintained below -60 °C. Solution was dark brown / black clear at this point and was allowed to stir for 1.5 hours at -75 °C. The reaction was quenched with acetic acid (1.6 mL, 28 mmol) dissolved in 5 mL of diethyl ether, added drop-wise while the reaction was cooled in the dry ice acetone bath. The temperature was maintained below -60 °C. LCMS revealed mostly one peak with the desired mass. The reaction was worked up by adding 100 mL of water, and layers were separated. The aqueous phase was extracted with ethyl acetate three times. The combined organic layers were washed with brine, dried over MgSC , and concentrated in vacuo to afford 8.14 grams of a clear amber oil. LCMS revealed a peak that was consistent with desired material. The material was absorbed onto silica gel and ran through an ISCO 80 gram column, eluting with CH2C12 / EtOAc. The broad peak looked to be a mixture of diastereomers in a ratio around 1.5:1. It was not determined which diastereomeric pair is the more predominant pair (0.988 g). The spiked shoulder from that broad peak looked to be a mixture of diastereomers in a ratio around 4: 1 (4.39 g).
At the same time, in my other blogs, there are other synthetic methods of this type of compound,54221-96-4, 6-Methoxypicolinaldehyde, and friends who are interested can also refer to it.
Reference:
Patent; MAYO FOUNDATION FOR MEDICAL EDUCATION AND RESEARCH; VIRGINIA TECH INTELLECTUAL PROPERTIES, INC.; RICHELSON, Elliott; FAUQ, Abdul H.; CARLIER, Paul R.; MONCEAUX, Christopher J.; WO2014/159251; (2014); A2;,
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