Reactions of thiobenzoylketene S,N-acetals with silyl enol ethers of cyclic ketones in the presence of desilylating reagents: formation and desulfurization of thienolactams
作者:Jong Seok Lee、Dong Joon Lee、Bo Sung Kim、Kyongtae Kim
DOI:10.1039/b102922n
日期:2001.11.1
Medium-sized thienolactams can be directly prepared from thiobenzoylketene S,N-acetals, Hg(OAc)2, and silyl enol ethers of cyclic ketones, and either TBAF or TASF. However, by adding either water or alcohol to the foregoing mixture, 3-methylamino-5-phenylthiophenes, in which the ω-position of long-chain alkanoic acids and alkanoic esters are bonded to C-2 of the thiophene ring, can be obtained albeit in low yields. Sequential treatment of the thienolactams with Raney nickel and Adam's catalyst results in completely reductive desulfurization of thienolactam molecules.
中文翻译结果:中等大小的噻吩内酰胺可以直接通过硫代苯甲酰基烯酮S,N-乙缩醛、Hg(OAc)2和环酮的硅醚烯醇以及TBAF或TASF制备。然而,通过向前述混合物中加入水或醇,可以获得低产率的3-甲基氨基-5-苯基噻吩,其中长链脂肪酸和脂肪酸酯的ω位与噻吩环的C-2位相连。噻吩内酰胺经过雷尼镍和亚当斯催化剂的连续处理,可以实现噻吩内酰胺分子的完全还原脱硫。