Hydrochloric Acid → methyl N-[2-chloro-5-(3-methoxy-3-methyl-1-butynyl)benzyl]carbamate

Participants

Reaction Conditions

Reaction Steps

0.60 g of methyl N-[2-chloro-5-(3-hydroxy-3-methyl-1-butynyl)benzyl]carbamate was dissolved in 10 ml of toluene. This solution was added at 0° C. to a mixture comprising 0.12 g of calcium chloride, 0.08 g of copper(I) iodide, 0.01 g of copper and 10 ml of concentrated hydrochloric acid, followed by stirring at 0° C. for 5 hours. This solution was poured into water and extracted with ethyl acetate, followed by drying over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the obtained crude product was dissolved in 10 ml, of methanol. To this solution, 0.50 g of sodium methylate (28 wt % methanol solution) was added at room temperature, followed by stirring at room temperature for 24 hours. The reaction mixture was poured into water and extracted with ethyl acetate, followed by drying over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was purified with silica gel column chromatography to obtain 0.52 g of methyl N-[2-chloro-5-(3-methoxy-3-methyl-1-butynyl)benzyl]carbamate as a brown viscous liquid.

Provenance & Evidence