Electric Literature of 402-65-3, As we all know, there are many different methods for the synthesis of a compound, and people can choose the synthesis method that suits their own laboratory according to the actual situation. 402-65-3, name is 2-Fluoroisonicotinic acid, molecular formula is C6H4FNO2, The compound is widely used in many fields, so it is necessary to find a new synthetic route. The downstream synthesis method of this compound is introduced below.
Intermediate 1; 3-[(2-Wi/oro-4-iodophenyl)amino]isonicotinic acid (R = Fluoro); A mixture of 2-fluoro-4-iodoaniline (20.0 g, 84.38 mmol) in dry THF (80 mL) was cooled to – 67 0C (dry ice/IPA bath) under nitrogen, prior to” slow addition of 1.0 M lithium bis(trimethylsilyl)amide (255 mL, 255 mmol) via addition funnel, at a rate that kept the internal temp below -59 0C (~2 h). After final addition, the yellow-green slurry was stirred for 30 min and then treated with 2-fluoroisonicotinic acid (8.0 g, 56.69 mmol). The bath was not removed, but the contents were allowed to slowly warm to room temp. After 4 days, the dark slurry was poured into a biphasic mixture of aqueous 2.0 lf sodium hydroxide (1000 mL) and ethyl acetate (150 mL). The aqueous layer was separated and the organics were again extracted with base (1000 mL). The pH of the two aqueous layers was adjusted to ~2 with concentrated hydrochloric acid. A yellow solid precipitated, which was filtered. The resultant yellow cake was washed with water (2 x 400 mL) and dried under high vacuum at 40 0C (17- 19 g). LC/MS [(5.2 min; 359 (M+1)].
According to the analysis of related databases, 402-65-3, the application of this compound in the production field has become more and more popular.
Reference:
Patent; APPLIED RESEARCH SYSTEMS ARS HOLDING N.V.; WO2006/45514; (2006); A1;,
Pyridine – Wikipedia,
Pyridine | C5H5N – PubChem