反应详情

Methyl 2-methoxycarbonylmethylthio-4-methylphenoxyacetate (8.9 g) is treated with sodium methoxide in the same manner as described in Reference Example 2 to give methyl 7-methyl-3-oxo-3,4-dihydro-2H-1,5-benzoxathiepin-4-carboxylate (5.8 g) as a colorless oil.