这封信涉及史无前例的串联迈克尔加成反应-山梨醇酐的弗里斯重排,可方便地一锅合成新的苯并[ b ]偶氮星6-酮。该反应被认为是通过δ-内酰胺中间体进行的,该中间体先前被认为对于弗里斯重排没有反应。通过研究α,β-不饱和酸酐的反应,进一步支持了所提出的机理。它们无法在相似的反应条件下进行任何转化,尤其是Fries-Michael重排,间接验证了该机理。
A simple and practical thio-Michael addition of α,β-unsaturatedamides catalyzed by Nmm-based ionic liquids with a 1,2-propanediol group has been developed. All the α,β-unsaturatedamides without substituents at the carbon end could smoothly react with sulfur-nucleophiles in water. Meanwhile for thio-Michael addition of α,β-unsaturatedamides with substituents at the carbon end, the relevant product