Citric Acid → (1RS,4RS)-3-ethyl-4-methyl-4-methoxymethoxy-2-cyclopenten-1-yl (t-butyldimethylsilyl) ether

Participants

Reaction Steps

To a solution mixture of 2.1 g of (1RS,4RS)-3-ethyl-4-methyl-4-hydroxy-2-cyclopenten-1-yl (t-butyldimethylsilyl) ether, 2.7 g of N,N-diisopropylethylamine and 30 ml of chloroform was added under ice-cooling 1.24 ml of chloromethyl methyl ether, and the resulting mixture was allowed to react at room temperature for 8 hours. Then the reaction liquid was poured into ice-cooled 5% aqueous solution of citric acid and extracted two times with diethyl ether. The combined ether layer was washed successively with saturated aqueous sodium bicarbonate solution and saturated aqueous sodium chloride solution, then dried over anhydrous magnesium sulfate, and the solvent was distilled off under reduced pressure. The residue thus obtained was subjected to silica gel column chromatography to obtain 2.35 g of (1RS,4RS)-3-ethyl-4-methyl-4-methoxymethoxy-2-cyclopenten-1-yl (t-butyldimethylsilyl) ether. Yield 95%

Provenance & Evidence