Electric Literature of 39806-90-1,Some common heterocyclic compound, 39806-90-1, name is 4-Iodo-1-methyl-1H-pyrazole, molecular formula is C4H5IN2, traditional synthetic route has been very mature, but the traditional synthetic route has various shortcomings, such as complicated route, low yield, poor purity, etc, below Introduce a new synthetic route.
A solution of 4-iodo-1-methyl-1H-pyrazole (83.8 mg, 0.403 mmol) in THF (0.8 mL) was added dropwise under argon to a -72 C. solution of n-BuLi (0.156 mL, 0.403 mmol, 2.6 M in hexane) in THF (0.5 mL). The resulting mixture was stirred at -72 C. for 25 minutes, and was then treated dropwise with a solution of an inseparable mixture of (3-benzyl-2,4-dichloroquinolin-6-yl)(4-chlorophenyl)methanone (79 mg, 0.185 mmol, Intermediate 33: step d) and ethyl 3-benzyl-2,4-dichloroquinoline-6-carboxylate (66 mg, 0.183 mmol, Intermediate 33: step c) in THF (0.8 mL) and stirred at -72 C. for 30 minutes. The yellow reaction was then allowed to warm to 0 C. over 15 minutes and stirred for an additional 15 minutes at 0 C. The clear amber reaction was then quenched with 5 M aqueous NH4Cl (3 mL). The aqueous layer was extracted with 4:1 ether/DCM (2*3 mL), and the combined organic layers were dried (Na2SO4), filtered, and concentrated. The residue was flash chromatographed with a heptane to 20% EtOAc/heptane gradient and further purified with C18 HPLC (20% to 100% CH3CN, with 0.1% TFA throughout) to provide, after lyophilization, the title compound as a yellow powder. 1H NMR (400 MHz, CDCl3) delta ppm 8.33 (d, J=1.96 Hz, 1H), 7.99 (d, J=8.80 Hz, 1H), 7.69 (dd, J=1.96, 8.80 Hz, 1H), 7.48 (s, 1H), 7.31-7.38 (m, 4H), 7.16-7.31 (m, 6H), 4.53 (s, 2H), 3.96 (s, 3H); MS m/e 507.7 [M+H]+.
These compound has a wide range of applications. It is believed that with the continuous development of the source of the synthetic route 4-Iodo-1-methyl-1H-pyrazole, its application will become more common.