反应详情

A 2.5M solution of n-butyllithium (2.2 mL; 5.5. mM) was slowly added to a solution of 2-bromo-5-(3'-bromophenyl)thiophene (1.59 g; 5 mM) in 10 mL of tetrahydrofuran at -78° under nitrogen. The mixture was stirred 10 mins. and dimethyldisulfide (1.35 mL; 15 mM) was added slowly. This mixture was stirred overnight at R.T. after which 5 mL of sat'd. ammonium chloride and 15 mL of ethyl acetate were added. The organic phase was separated, washed with 2×5 mL of sat'd. sodium chloride, and dried over anhyd. magnesium sulfate. Solvent removal and purification on silica gel with hexane as solvent gave 2-methylthio-5-(3'-bromophenyl)thiophene as a colorless oil boiling at 142°-5°/0.5 mm.

1. stirringThis mixture was stirred overnight at R.T. after which 5 mL of sat'd
2. customThe organic phase was separated
3. washwashed with 2×5 mL of sat'd
4. dry with materialsodium chloride, and dried over anhyd
5. customSolvent removal and purification on silica gel with hexane as solvent