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ChemInform Abstract: Ring Closure of 4-Azido-3-formyl-(or acetyl-)2-pyridones to Isoxazolo( 4,3-c)pyridones.

✍ Scribed by A. F. KHATTAB

Book ID
112037377
Publisher
John Wiley and Sons
Year
2010
Weight
31 KB
Volume
27
Category
Article
ISSN
0931-7597

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Ring Closure of 4-Azido-3-formyl-(or Ace
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## Abstract Azidation of the chlor aldehyde 2, which was obtained from the 4‐hydroxy‐2‐pyridone 1, afforded the ring‐closed isoxazolopyridone 3. Thermolysis of the 3‐acetyl‐4‐azido‐2‐pyridone 8, which was obtained from the corresponding 4‐tosyloxy derivative 7, afforded isoxazolopyridine 9. Aminati

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C-3 Acetoxylation of N-Acyl-2,3-dihydro-4-pyridones. -Stereoselective C-3 acetoxylation of various N-acyldihydropyridones (I) is achieved under mild conditions using lead tetraacetate. The analogous reaction of the indolizidinone (IV) to the cis product proceeds with considerably lower yield.

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## Abstract Thermolysis of the 4‐azido‐3‐formyl‐2‐quinolone 6, which was prepared from the 4‐hydroxy‐2‐quinolone 1, afforded the ringclosed isoxazoloquinolone 7. 3‐(Arylaminomethylene)‐2,4‐quinolinediones 2 could not be transformed into an azide precursor in order to obtain the corresponding pyrazo