Methyl chloroformate → HCID 24895908, compound

Participants

Reaction Steps

In a solution of 0.50 g of N-[4-[5-(3,5-dichlorophenyl)-5-trifluoromethyl-4,5-dihydroisoxazol-3-yl]-2-methyl benzoyl]-N′-ethyl urea synthesized similarly to Synthetic Example 26 in 4 mL of tetrahydrofuran, 4 mL of 1M tetrahydrofuran solution of lithium hexamethyl disilazane was added at −78° C. with stirring, and stirred at the same temperature for 30 minutes. Then, 0.12 g of methyl chloroformate was added in the reaction mixture at −78° C. with stirring. After the completion of the addition dropwise, it was continued to stir further for 18 hours while the temperature was slowly raised to room temperature. After the completion of the reaction, 30 mL of ice water was added, and extracted with ethyl acetate (30 mL×2). The organic phase was dehydrated with and dried over saturated sodium chloride aqueous solution and anhydrous sodium sulfate, and the solvent was distilled off under reduced pressure. The residue was purified with silica gel column chromatography that was eluated with ethyl acetate-hexane (gradient of 0:1 to 1:2) to obtain 0.29 g of the aimed product as colorless resinous substance.

Provenance & Evidence