Synthesis p. 41 - 42 (1991)
Update date:2022-07-29
Topics:
Nishiwaki
Komatsu
Ohshiro
3-Cyano-2-(phenylethynyl)pyridine (1) was cyclized intramolecularly under acidic conditions to give 1,6-naphthyridin-5(6H)-one (2) and 5H-pyrano[4,3-b]pyridine-5-one (4). Pyranopyridine 4 was readily transformed to 2 or naphthyridinone 9 having an alkyl substituent at 6-position.
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