反应详情

A solution of 3-(5-bromothiophen-2-yl)-3-hydroxypropyl acetate (1.92 g, 6.9 mmol, 1.0 equiv.), TBDMSCl (1.24 g, 8.3 mmol, 1.2 eq) and 1H-imidazol (1.4 g, 20.7 mmol, 3.0 eq) in CH2Cl2 (50 mL) was stirred for 4 h at 60° C. Water was added and the reaction was extracted with EtOAc (3×200 ml). The combined organic phases were washed (brine), dried (Na2SO4), filtered and concentrated to give a residue, which was purified by silica gel column chromatography (PE/EA=100:1 as eluant) to produce 3-(5-bromothiophen-2-yl)-3-(tert-butyldimethylsilyloxy)propyl acetate (2.6 g, 97.6%) as yellow oil. LC-MS (m/z): 393.1 [M+H]+;

1. extractionthe reaction was extracted with EtOAc (3×200 ml)
2. washThe combined organic phases were washed (brine)
3. dry with materialdried (Na2SO4)
4. filtrationfiltered
5. concentrationconcentrated
6. customto give a residue, which
7. customwas purified by silica gel column chromatography (PE/EA=100:1 as eluant)