Diversity in the Base-induced Photoreactions of Thiolane-2,4-dione and Derivatives. Reductive Ring Cleavage and Novel Rearrangements of the Carbon Skeleton
作者:Kimitoshi Saito、Tadashi Sato
DOI:10.1246/bcsj.52.3601
日期:1979.12
The irradiation of thiolane-2,4-dione (thiotetronic acid) and its derivatives, 1a–1d, in methanol in the presence of bases induced the reductive ring cleavage to give β,β′-diketo esters. The base-induced reductive ring cleavage was also observed in aprotic solvents, such as acetonitrile or acetone, although the products were obtained as β,β′-diketo amides in these cases. On the other hand, the irradiation
在碱存在的情况下,在甲醇中对硫戊环-2,4-二酮(硫代特酮酸)及其衍生物 1a-1d 进行辐照诱导还原性环裂解,生成 β,β'-二酮酯。在非质子溶剂(如乙腈或丙酮)中也观察到碱诱导的还原环裂解,尽管在这些情况下获得的产物是 β,β'-二酮酰胺。另一方面,在碱存在的情况下,在水中照射 1a-1d 会引起碳骨架的重排,生成琥珀酸硫酐、γ-酮酰胺或琥珀酰胺以及还原产物。当吡啶用作水中光解的碱时,两种 3-乙酰基衍生物 1a 和 1b 产生 γ-酮硫醇和相应的二硫化物,这是由另一种类型的碳骨架重排产生的。