Chloroiodomethane → HCID 10401400, compound

Participants

Reaction Steps

To a solution of N-BOC-L-isoleucine (23.1 g, 0.1 mol) in dioxane (500 mL), was added dropwise a 40% aqueous solution of tetrabutylammonium hydroxide (65.6 mL, 0.1 mol). After stirring for 15 min, the solution was evaporated to dryness through co-evaporation with dioxane and toluene. The residue was dissolved in dichloromethane (500 mL) and then chloroiodomethane (72.8 mL, 1 mol) was added and the solution was stirred for 6 h at room temperature. The solution was concentrated under reduced pressure and the residue was shaken with hexane/ethyl acetate (1:1 v/v, 400 mL). The yellow crystalline solid was filtered off and the filtrate was washed with aqueous solution of sodium thiosulfate (0.1 M) and then filtered through anhydrous sodium sulfate and evaporated to dryness. The residue was column chromatographed (silica gel, 1-2% MeOH in CH2Cl2), to give 20.8 g of N-BOC-L-isoleucine chloromethyl ester.

Provenance & Evidence