27296-22-6Relevant academic research and scientific papers
GENERATION OF SPECIFICALLY SUBSTITUTED PYRIDINES AND PYRIDONES FROM 2(1H) PYRAZINONES AND ACETYLENES: A FMO DESCRIPTION
Tutonda, M.,Vanderzande, D.,Hendrickx, M.,Hoornaert, G.
, p. 5715 - 5732 (2007/10/02)
The title compounds were obtained from reaction of variously substituted 2(1H)pyrazinones with acetylenic derivatives.Experimental evidence points out to a two step mechanism: a Diels Alder cycloaddition followed by immediate decomposition of the adducts
DIELS-ALDER REACTIONS OF THE HETERODIENE SYSTEM IN 2(1H)-PYRAZINONES
Tutonda, M.,Vanderzande, D.,Vekemans, J.,Toppet, S.,Hoornaert, G.
, p. 2509 - 2512 (2007/10/02)
Variously substituted 2(1H)-pyrazinones react with acetylenic derivatives to give specifically substituted pyridones or pyridines.The observed selectivity can be explained in terms of HO-LU interactions for the reagents and two competitive retro Diels-Ald
Halogenated Ketenes. 38. Cycloaddition of α,β-Unsaturated Imines with Ketenes To Yield Both β- and δ-Lactams
Brady, William T.,Shieh, C. H.
, p. 2499 - 2502 (2007/10/02)
The cycloaddition of various types of α,β-unsaturated imines with diphenyl- and dichloroketenes yields both (2 + 2) and (4 + 2) cycloaddition products, i. e., β-lactams and δ-lactams, respectively.The cycloaddition products are dependent upon substitution in the imine and the ketene.The δ-lactams derived from dichloroketene are easily dehydrochlorinated to the corresponding 2-pyridones.All of the results are consistent with a two-step cycloaddition process involving a dipolar intermediate.
