Cine substitution in reaction of unactivated 2-halopyridines with 2-aminopyridine 1-oxide. Formation of 3-(2-pyridylamino)-2(1H)-pyridone [1]

• Autorzy: Rykowski, A. , Pucko, W.
• Języki publikacji: EN

Abstrakty

EN

Reaction of 2-aminopyridine 1-oxide 1a with 2-fluoropyridine 5a in DMF at 140 degree C gave 2-(2-pyridylamino)pyridine 1-oxide 6 (41%) along with bis(2-pyridyl)amine 7 (5%). However, heating in melt of 1a with 2-chloropyridine 5b or 2-bromopyridine 5c in the presence of dry potassium carbonate at 175 degree C provided 3-(2-pyridylamino)-2(1H)-pyridone 9 as cine substitution product. Compound 9 results from the nucleophilic attack of the N-oxide on the carbon atom bearing halogen to give corresponding cation 17, which rearranges to cine substitution product 9 via anhydro-base 18.

Słowa kluczowe

EN

2-aminopyridine 1-oxide; 2-halopyridines; cine substitution

• Czasopismo: Polish Journal of Chemistry
• Rocznik: 1998
• Tom: Vol. 72, nr 11
• Strony: 2378-2383
• Opis fizyczny: Bibliogr. 11 poz.

Twórcy

autor

Rykowski, A.

autor

Pucko, W.

• Institute of Chemistry, Agricultural and Teachers University, 3-go Maja 54 08-110 Siedlce, Poland