反应详情

n-BuLi (3.16 mL of a 1.6 M solution in hexanes, 4.96 mmol) was added dropwise to a −78° C. solution of 2,4,5-tribromo-1-({[2-(trimethylsilyl)ethyl]oxy}methyl)-1H-imidazole (2.16 g, 4.96 mmol) in THF (50 mL). After 30 min, paraformaldehyde (0.74 g, 24.82 mmol) was added. The reaction mixture was warmed to RT, stirred overnight, quenched by addition of sat'd NH4Cl and extracted with EtOAc. The organic phase was dried (Na2SO4), filtered, and purified by silica gel chromatography (5-60% EtOAc/hex) to afford the title compound (0.57 g, 302%) as a clear oil. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 5.44 (d, J=0.46 Hz, 2H), 4.74-4.88 (m, 2H), 3.49-3.69 (m, 2H), 0.88-1.02 (m, 2H), −0.13-0.22 (m, 9H).

1. customquenched by addition of sat'd NH4Cl
2. extractionextracted with EtOAc
3. dry with materialThe organic phase was dried (Na2SO4)
4. filtrationfiltered
5. custompurified by silica gel chromatography (5-60% EtOAc/hex)