139032-02-3Relevant articles and documents
Regio- and stereochemistry of 1,3-dipolar cycloadditions of 3-pyridinol and 3-oxidopyridinium betaines with β-nitrostyrenes
El-Abbady, S A,Al-Ahmady, A A,Moustafa, A H
, p. 24 - 29 (2007/10/02)
3-Pyridinol (1a) reacts with β-nitrostyrenes either as a Michael doner to give the (1:1) Michael adducts 2-aryl-2-(pyrid-3-yloxy)-1-nitroethanes (3a-d), or as 4?-1,3-dipoles across the 2,6-positions of the pyridine ring to give (1:2) cycloadducts 8-(1-aryl-2-nitroethyl)-8-azabicyclooct-3-en-2-ones (4a-c). 1-Methyl- and 1-phenyl-3-oxidopyridinium betaines (1b and 1c) react as 4?-1,3-dipole to give (1:1) 2,6-cycloadducts (5a-c).Structural and configurational assigments have been deduced from PMR and IR spectral data.