Photoinduced ring transformation of pyrido-[1,2-b]pyridazinium-4-olate
作者:Sándor Bátori、Dietrich Döpp、András Messmer
DOI:10.1016/s0040-4020(01)85009-2
日期:1994.4
The photolytic behaviour of the zwitterionic pyrido[1,2-b]pyridazinium-4-olate (1) was studied. A marked difference was observed depending on the wavelength used; irradiation with a light of lambda>280 nm resulted in 3-phenyl-5-(2-pyridyl)isoxazole (2) and 2-phenyl-3-(2-pyridylcarbonyl)azirine (3) as main products, while the use of light of lambda<280 afforded 2-phenyl-5-(2-pyridyl)-oxazole (5) and 1-amino-1-phenyl-3-(2-pyridyl)prop-1-en-3-one (6) as main products. A mechanistic suggestion is provided.
Batori, Sandor; Messmer, Andras, Journal of Heterocyclic Chemistry, 1990, vol. 27, # 6, p. 1673 - 1680