Electric Literature of 51985-95-6, These common heterocyclic compound, 51985-95-6, name is Methyl 5-hydroxy-1-methyl-1H-pyrazole-3-carboxylate, its 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) methyl 5-(4-((tert-butyl(dimethyl)silyl)oxy)phenoxy)-1-methyl-1H-pyrazole-3-carboxylate (1089) A mixture of 660 methyl 5-hydroxy-1-methyl-1H-pyrazole-3-carboxylate (2.68 g), 661 (4-((tert-butyl(dimethyl)silyl)oxy)phenyl)boronic acid (4.33 g), 662 copper(II) acetate (4.69 g), 121 triethylamine (3.90 ml), molecular sieves 4A (5.5 g) and 110 dichloromethane (60 ml) was stirred at room temperature for 15 hr. The reaction mixture was filtered, and the filtrate was concentrated under reduced pressure. The obtained residue was purified by silica gel column chromatography (petroleum ether/ethyl acetate) to give the 663 title compound (600 mg). 1H NMR (400 MHz, CDCl3) delta 0.20 (6H, s), 0.99 (9H, s), 3.83 (3H, s), 3.89 (3H, s), 6.03 (1H, s), 6.75-6.86 (2H, m), 6.95-7.05 (2H, m).
The synthetic route of 51985-95-6 has been constantly updated, and we look forward to future research findings.