Methyl iodide → HCID 67958584, compound

Participants

Reaction Conditions

Reaction Steps

[(7-bromo-3,3-dimethyl-2,3-dihydro-1-benzofuran-4-yl)oxy][tris(1-methylethyl)]silane (Intermediate 182, 7.1 g, 17.72 mmol) was dissolved in anhydrous THF (72 mL) and cooled to 0° C. Tetramethylethylenediamine (8.0 mL, 53.16 mmol) was added and the yellow solution was stirred at 0° C. for 10 min. A solution of 1.6 M butyllithium in hexane (22.5 mL, 35.4 mmol) was added drop wise over 10 minutes and then stirred at 0° C. for 15 min. Methyl iodide (11 mL, 177.2 mmol) was added drop wise over 6 min. The white solid was removed by filtration and the wet cake was washed in with THF. The combined organic layers were evaporated to dryness. The residue was dissolved in ethyl acetate and washed twice with aqueous NaHCO3 and once with water. The organic solution was dried on anhydrous Na2SO4 and evaporated to dryness. to give brown oil. The residue was purified by flash chromatography on silica gel using cyclohexane to cyclohexane/ethyl acetate 1:1 as eluents affording the title compound (3.6 g) as a brown oil.

Provenance & Evidence