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).