反应详情

3.1 g of 5-[4-(6-hydroxy-2,5,7,8-tetramethylchroman-2-ylmethoxy)benzyl]-2-iminothiazolidin-4-one [prepared as described in Example 1(a)] were added to a mixture of 45 ml of acetic acid, 15 ml of concentrated hydrochloric acid and 8 ml of water, and the mixture was reacted for 12 hours at 85°-90° C. It was then processed and purified in a similar manner to Example 1(a), giving 2.5 g of 5-[4-(6-hydroxy-2,5,7,8-tetramethylchroman-2-ylmethoxy)benzyl]thiazolidine-2,4-dione, whose melting point and nuclear magnetic resonance spectrum were consistent with those of the product of Example 1(b).

1. customthe mixture was reacted for 12 hours at 85°-90° C
2. custompurified in a similar manner to Example 1(a)