A highly efficient, mild, and simple protocol is presented for the oxidative aromatization of Hantzsch 1, 4-dihydropyridines using the combination of Dess-Martin periodinane with molecular iodine or KBr. The in situ generated acetyl hypoiodite or bromite formed due to the reaction between Dess-Martin periodinane and molecular iodine or KBr respectively is supposed to be the responsible species for bringing about the oxidative aromatization of 1, 4-dihydropyridines.
Other 6-membered heterocycles R 0670
Synthesis of 2,5-Disubstituted 1,3,4-Oxadiazine and 1,3,4-Thiadiazine from Substituted Acetophenones and Acid Hydrazides Using [Hydroxy(tosyloxy)iodo]ben-zene. -(KARADE*, N. N.; KONDRE, J. M.; GAMPAWAR, S. V.; SHINDE, S. V.; Synth.
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