反应详情

By following substantially the same procedure described in Example 108, Steps B and C, but substituting methyl 2-(2-pyridyl)-2-(2-carbomethoxymethoxyphenoxy)-acetate for the 1,2-bis-(carbomethoxymethoxy)benzene there is obtained sequentially 2-(2-pyridyl)-3-oxo-4-carbomethoxy-3,4-dihydro-2H-1,5-benzodioxepin and then 2-(2-pyridyl)-3-oxo-3,4-dihydro-2H-1,5-benzodioxepin.