反应详情

In an analogous manner to that described in the first paragraph of Example 8, from 0.22 g of 6-[5-cyano-2-hydroxy-α-(2-methylpropenyl)benzyl]pyrimidine 1-oxide there was obtained 0.01 g of 6-(6-cyano-3,4-dihydro-2,2-dimethyl-2H-1-benzopyran-4-yl)pyrimidine 1-oxide in the form of an off-white solid (from ethyl acetate/n-hexane).