反应详情

At -8°C to -12°C and while stirring, 10.3 parts by weight of acetyl chloride was added to a solution of 28.7 parts by weight of 2,3-dihydro-3,3-dimethyl-2-hydroxybenzofuran-5-yl dimethylaminosulfonate and 14.1 parts by weight of triethylamine in 110 parts by weight of ether. The mixture was worked up as in Example 1, the compound 2,3-dihydro-3,3-dimethyl-2-methylcarbonyloxybenzofuran-5-yl dimethylaminosulfonate being obtained in the form of crystals; melting point: 67° to 68°C.