Methyl iodide → Butyl 1-methylcyclopropane-1-sulfonate

Participants

Reaction Conditions

Reaction Steps

To a solution of butyl cyclopropanesulfonate (1.5 g, 8.4 mmol, Preparation #6 Step A) in THF (8 mL) at about −78° C. was added n-BuLi (1.6 M in hexanes, 5.26 mL, 8.42 mmol) and iodomethane (0.684 mL, 10.9 mmol) simultaneously. The resulting mixture was stirred at about −78° C. for about 2 h and then at ambient temperature for about 2 h. The reaction was quenched by the addition of saturated aqueous NH4Cl (7 mL) and the layers were separated. The aqueous layer was extracted with EtOAc (15 mL) and the combined organic extracts were dried over anhydrous MgSO4, filtered, and concd under reduced pressure. The residue was purified by silica gel column chromatography eluting with 5 to 25% EtOAc in heptanes to yield butyl 1-methylcyclopropane-1-sulfonate (0.8 g, 49%) as a colorless oil. 1H NMR (DMSO-d6) δ 4.17 (t, 2H), 1.62 (m, 2H), 1.43 (s, 3H), 1.35 (m, 2H), 1.22 (m, 2H), 0.94 (m, 2H), 0.88 (t, 3H).

Provenance & Evidence