Imidazoline-4-thiones from cyanothioformamides and aldehyde imines: Formation, aromatization, and acetylation
作者:Ahmed M. Sh. El-Sharief、Roger Ketcham、Monika Ries、Ernst Schaumann、Gunadi Adiwidjaja
DOI:10.1002/jhet.333
日期:——
with a second equivalent of 3a to give 8 which in turn is oxidized to disulfide 9. Using araldimines 5b,5c, only 1:2 intermediates 10 derived from 3a, 3b and two moles of the imine 5 are formed, but proved to be easily oxidized to disulfides 11. Acetylation of 6 occurs chemoselectively on the exocyclic nitrogen and finally also on the thione sulfur to give 14 via 13. J. Heterocyclic Chem., (2010).
的反应ñ -甲基- (图3a)或ñ -phenylcyanothioformamide(图3b )与acetaldimine(5A,1-氨基-1-乙醇),得到5-(氨基)咪唑烷-4-硫酮6B。产物6a与第二当量3a反应以得到8,其又被氧化成二硫化物9。使用阿勒二胺5b,5c,仅形成了1:2的衍生自3a,3b的中间体10和两摩尔的亚胺5,但事实证明它们易于氧化为二硫化物。11。6的乙酰化在环外氮上发生化学选择性,最后在硫酮硫上也发生化学反应,从而通过13生成14 。J.杂环化学。(2010)。