At the same time, in my other blogs, there are other synthetic methods of this type of compound,1445-39-2, 2-Amino-5-iodopyrimidine, and friends who are interested can also refer to it.
Application of 1445-39-2, Researchers who often do experiments know that organic synthesis is a process of preparing more complex target molecules from simple raw materials through one or more chemical reactions. Generally, it requires fewer steps,and cheap raw materials. 1445-39-2, name is 2-Amino-5-iodopyrimidine. A new synthetic method of this compound is introduced below.
b) N-(3-((2-aminopyrimidin-5-yl)ethynyl)-2,4-difluorophenyl)-5-chloro-2-methoxypyridine-3-sulfonamide acetate A mixture of 5-chloro-N-(3-ethynyl-2,4-difluorophenyl)-2-methoxypyridine-3-sulfonamide (1.24 g), 5-iodopyrimidin-2-amine (1.15 g), dichlorobis(tricyclohexylphosphine)palladium(II) (170 mg), cesium carbonate (4.51 g) and DMSO (16.5 mL) was stirred under a nitrogen atmosphere at 120 C. for 3 hr. After cooling to room temperature, the mixture was diluted with water/saturated brine and extracted three times with ethyl acetate. The obtained organic layer was washed with saturated brine, dried over magnesium sulfate and concentrated to give a residue. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) to give the title compound as a crude purified product in a free form. The obtained title compound as a crude purified product in a free form was dissolved in DMF/toluene and subjected to silica gel column chromatography (NH, methanol/ethyl acetate) to elute a byproduct. Silica gel supporting a free form of the title compound was added to ethyl acetate (100 mL), acetic acid (18 mL) and water (100 mL), and the mixture was stirred at room temperature for 10 min. The mixture was filtered and silica gel on the filter was treated 4 times with ethyl acetate/acetic acid (30 mL/6 mL) to elute the object product. The organic layer was collected from the filtrate, and the organic layer was washed with water and saturated brine, dried over magnesium sulfate and concentrated to give a residue. The residue was dissolved in an ethyl acetate/THF/saturated aqueous sodium hydrogen carbonate solution, and the obtained organic layer was washed with a saturated aqueous sodium hydrogen carbonate solution and saturated brine, dried over magnesium sulfate and concentrated to give a residue. The residue was purified by silica gel column chromatography (ethyl acetate/hexane) and washed with ethyl acetate to give the title compound as a crude purified product in a free form. The same reaction was performed at 4.05-fold amount and 4.12-fold amount. The obtained title compounds as crude purified products in a free form were collected, acetic acid (24.8 mL) was added and the mixture was heated to 50 C. To the mixture was added DMSO (66 mL) at 50 C. and dissolved therein. The mixture was filtered, and a trace amount of an insoluble material on the filter was washed with acetic acid (24.8 mL). The filtrate was heated to 50 C. and water (50 mL) was added dropwise. The mixture was cooled to room temperature over 30 min. The precipitate was collected by filtration, washed three times with ethanol/water (1/10, 33 mL) and dried at 50 C. under reduced pressure to give the title compound (5.53 g). 1H NMR (300 MHz, DMSO-d6) delta 1.91 (3H, s), 3.94 (3H, s), 7.14-7.37 (4H, m), 8.07 (1H, d, J=2.6 Hz), 8.43 (2H, s), 8.52 (1H, d, J=2.6 Hz), 10.46 (1H, s), 11.94 (1H, s).
At the same time, in my other blogs, there are other synthetic methods of this type of compound,1445-39-2, 2-Amino-5-iodopyrimidine, and friends who are interested can also refer to it.
Reference:
Patent; Takeda Pharmaceutical Company Limited; FUJIMOTO, Jun; LIU, Xin; KURASAWA, Osamu; TAKAGI, Terufumi; CARY, Douglas Robert; BANNO, Hiroshi; ASANO, Yasutomi; KOJIMA, Takuto; (159 pag.)US2019/169166; (2019); A1;,
Pyrimidine | C4H4N2 – PubChem,
Pyrimidine – Wikipedia