Interannular contraction upon oxidation of a mesoionic bicyclic imine
作者:Peter J. Dunn、Charles W. Rees、Alexandra M. Z. Slawin、David J. Williams
DOI:10.1039/c39890001134
日期:——
The bicyclicimine (1) is oxidised exclusively at the thiadiazole ring to give the mono-,di-,and tri-oxides (2), (3), and (4); subtle but marked changes in the pattern of bonding and intramolecular interactions in the X-ray crystal structures of (1)–(4) reflect the increasing contribution of dipolar mesoionic forms [e.g.(1a)] along the series, and this in turn is reflected in the formation and chemistry
Synthesis of 3,5-bis(acyl)-1,2,4-thiadiazoles via iodine mediated oxidative dimerization of α-oxothioamides
作者:Rajaghatta N. Suresh、Toreshettahally R. Swaroop、Veeresha Gowda Shalini、Kempegowda Mantelingu、Kanchugarakoppal S. Rangappa
DOI:10.1016/j.tetlet.2022.154302
日期:2023.2
A novel and an efficient method for the synthesis of 3,5-bis(acyl)-1,2,4-thiadiazoles by the oxidative cyclization of α-oxothioamides with assistance of moleculariodine has been reported. The required substrates – α-oxothioamides have been synthesized by the reaction of α-oxodithioesters with ammonium chloride and sodium acetate. The probable mechanism for the formation of products has presented.