中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | (Z)-2-benzylidenebenzo[b]thiophen-3(2H)-one | 63329-72-6 | C15H10OS | 238.31 |
Epimeric thioflavanone sulfoxides (2b) were selectively transformed into thioflavone (1a), thioaurone (3a), and di(2-cinnamoylphenyl) disulfide (4). Disulfide 4 can be recyclized into thioaurones (3ac) and thioflavanones (2a,5) with heterolysis of the SS bond. The 3-p-anisylidene sulfoxide analog of 2b (6) transforms, with fragmentation, into 4'-methoxythioaurone 3b.Key words: chalcone, ring contraction, sulfoxides, thioaurones, thioflavonoids.
A highly regioselective [3 + 2] annulation of Morita–Baylis–Hillman (MBH) carbonates of isatin with aurone/thioaurone is developed.