反应详情

The captioned end product was obtained in the same manner as in Preparation Example 3-3 except that the 8-chloro-6-ethoxycarbonyl-5-methylthiochroman-4-one as a starting material in Preparation Example 3-3 was replaced with 6-ethoxycarbonyl-5,8-dimethylthiochrom-2-en-4-one and that the reflux time was changed to 18 hours. The yield was 96%.