Imidazole → 4-(Tert-butyldimethylsilyloxy)-5-methoxycarbonyloxy-6-(methoxymethoxy)-3,3a,4,5,6,7-hexahydro-2,1-benzoisooxazole

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Reaction Steps

4-Hydroxy-5-methoxycarbonyloxy-6-(methoxymethoxy)-3,3a,4,5,6,7-hexahydro-2,1-benzoisooxazole (275 mg) was dissolved in 10 ml of methylene chloride, and 200 mg of imidazole and 226 mg of tert-butyldimethylsilyl chloride were added, followed by stirring the mixture overnight at room temperature. The reaction mixture was diluted with diethyl ether, and washed with dilute hydrochloric acid, a sodium hydrogen carbonate aqueous solution and a sodium chloride aqueous solution in sequence. The organic layer was dried over anhydrous sodium sulfate, and concentration was effected under reduced pressure. The obtained residue was purified by silica gel column chromatography to give 285 mg of 4-(tert-butyldimethylsilyloxy)-5- methoxycarbonyloxy-6-(methoxymethoxy)-3,3a,4,5,6,7-hexahydro-2,1-benzoisooxazole having the following property (yield 73%).

Provenance & Evidence