The reaction of the p-tolyl(or phenyl)sulfonylhydrazones of some 2-(alkenyloxy)benzaldehydes with lead tetraacetate leads, via the nitrile imide intermediates, Ar–\overset+C=N–\overset−N–SO2–C6H4–X-p, to intramolecular 1,3-dipolar cycloadducts and 1-acetyl-2-aroyl-1-[p-tolyl(or phenyl)sulfonyl]hydrazines in 20–65% and 7–70% yields respectively, while the intermolecular reactions of the benzaldehyde
Hypervalent iodine (III)-mediated oxidation of aryl sulfonylhydrazones: A facile synthesis of N-aroyl-N′-acyl arylsulfonylhydrazides
作者:E. Ramakrishna、Kapil Dev、Saransh Wales Maurya、Ibadur Rahman Siddiqui、Rakesh Maurya
DOI:10.1016/j.tetlet.2016.12.085
日期:2017.2
We have developed a novel and efficient method for the oxidation of aryl sulfonylhydrazones to N-aroyl-N′-acyl arylsulfonylhydrazides, using hypervalentiodine (III) reagent in good yields at room temperature.